diff --git a/src/openrct2-ui/drawing/engines/HardwareDisplayDrawingEngine.cpp b/src/openrct2-ui/drawing/engines/HardwareDisplayDrawingEngine.cpp
index 8ff903d474..a7ecb40915 100644
--- a/src/openrct2-ui/drawing/engines/HardwareDisplayDrawingEngine.cpp
+++ b/src/openrct2-ui/drawing/engines/HardwareDisplayDrawingEngine.cpp
@@ -140,7 +140,7 @@ private:
         {
             void * pixels;
             sint32 pitch;
-            if (SDL_LockTexture(_screenTexture, NULL, &pixels, &pitch) == 0)
+            if (SDL_LockTexture(_screenTexture, nullptr, &pixels, &pitch) == 0)
             {
                 lightfx_render_to_texture(pixels, pitch, _bits, _width, _height, _paletteHWMapped, _lightPaletteHWMapped);
                 SDL_UnlockTexture(_screenTexture);
diff --git a/src/openrct2-ui/drawing/engines/SoftwareDrawingEngine.cpp b/src/openrct2-ui/drawing/engines/SoftwareDrawingEngine.cpp
index 4a5da047e0..6d5640d750 100644
--- a/src/openrct2-ui/drawing/engines/SoftwareDrawingEngine.cpp
+++ b/src/openrct2-ui/drawing/engines/SoftwareDrawingEngine.cpp
@@ -76,7 +76,7 @@ public:
             _palette == nullptr ||
             _RGBASurface == nullptr)
         {
-            log_fatal("%p || %p || %p == NULL %s", _surface, _palette, _RGBASurface, SDL_GetError());
+            log_fatal("%p || %p || %p == nullptr %s", _surface, _palette, _RGBASurface, SDL_GetError());
             exit(-1);
         }
 
diff --git a/src/openrct2-ui/input/KeyboardShortcuts.cpp b/src/openrct2-ui/input/KeyboardShortcuts.cpp
index a1208bb7fc..467134fa38 100644
--- a/src/openrct2-ui/input/KeyboardShortcuts.cpp
+++ b/src/openrct2-ui/input/KeyboardShortcuts.cpp
@@ -135,26 +135,26 @@ std::string KeyboardShortcuts::GetShortcutString(sint32 shortcut) const
     if (shortcutKey == SHORTCUT_UNDEFINED) return std::string();
     if (shortcutKey & SHIFT)
     {
-        format_string(formatBuffer, sizeof(formatBuffer), STR_SHIFT_PLUS, NULL);
+        format_string(formatBuffer, sizeof(formatBuffer), STR_SHIFT_PLUS, nullptr);
         String::Append(buffer, sizeof(buffer), formatBuffer);
     }
     if (shortcutKey & CTRL)
     {
-        format_string(formatBuffer, sizeof(formatBuffer), STR_CTRL_PLUS, NULL);
+        format_string(formatBuffer, sizeof(formatBuffer), STR_CTRL_PLUS, nullptr);
         String::Append(buffer, sizeof(buffer), formatBuffer);
     }
     if (shortcutKey & ALT)
     {
 #ifdef __MACOSX__
-        format_string(formatBuffer, sizeof(formatBuffer), STR_OPTION_PLUS, NULL);
+        format_string(formatBuffer, sizeof(formatBuffer), STR_OPTION_PLUS, nullptr);
 #else
-        format_string(formatBuffer, sizeof(formatBuffer), STR_ALT_PLUS, NULL);
+        format_string(formatBuffer, sizeof(formatBuffer), STR_ALT_PLUS, nullptr);
 #endif
         String::Append(buffer, sizeof(buffer), formatBuffer);
     }
     if (shortcutKey & CMD)
     {
-        format_string(formatBuffer, sizeof(formatBuffer), STR_CMD_PLUS, NULL);
+        format_string(formatBuffer, sizeof(formatBuffer), STR_CMD_PLUS, nullptr);
         String::Append(buffer, sizeof(buffer), formatBuffer);
     }
     String::Append(buffer, sizeof(buffer), SDL_GetScancodeName((SDL_Scancode)(shortcutKey & 0xFF)));
diff --git a/src/openrct2-ui/windows/About.cpp b/src/openrct2-ui/windows/About.cpp
index 944407d600..caa036f32d 100644
--- a/src/openrct2-ui/windows/About.cpp
+++ b/src/openrct2-ui/windows/About.cpp
@@ -93,65 +93,65 @@ static void window_about_rct2_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_about_openrct2_common_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_about_openrct2_events = {
-    NULL,
+    nullptr,
     window_about_openrct2_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_about_openrct2_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_about_rct2_events = {
-    NULL,
+    nullptr,
     window_about_rct2_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_about_rct2_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_about_page_events[] = {
@@ -171,7 +171,7 @@ rct_window * window_about_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_ABOUT);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_centred(
@@ -241,14 +241,14 @@ static void window_about_openrct2_paint(rct_window *w, rct_drawpixelinfo *dpi)
     utf8 *ch = buffer;
     openrct2_write_full_version_info(ch, sizeof(buffer) - (ch - buffer));
 
-    y += gfx_draw_string_centred_wrapped(dpi, NULL, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION, w->colours[2]) + 10;
+    y += gfx_draw_string_centred_wrapped(dpi, nullptr, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION, w->colours[2]) + 10;
 
     logoSize = gfx_get_sprite_size(SPR_G2_LOGO);
     gfx_draw_sprite(dpi, SPR_G2_LOGO, x - (logoSize.width / 2), y, 0);
     y += logoSize.height + 20;
 
-    y += gfx_draw_string_centred_wrapped(dpi, NULL, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION_2, w->colours[2]) + 15;
-    gfx_draw_string_centred_wrapped(dpi, NULL, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION_3, w->colours[2]);
+    y += gfx_draw_string_centred_wrapped(dpi, nullptr, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION_2, w->colours[2]) + 15;
+    gfx_draw_string_centred_wrapped(dpi, nullptr, x, y, width, STR_ABOUT_OPENRCT2_DESCRIPTION_3, w->colours[2]);
 
     gfx_draw_string_centred_wrapped(dpi, &ch, x, w->y + WH - 25, width, STR_STRING, w->colours[2]);
 
@@ -295,23 +295,23 @@ static void window_about_rct2_paint(rct_window *w, rct_drawpixelinfo *dpi)
     y = yPage + 5;
 
     // Credits
-    gfx_draw_string_centred(dpi, STR_COPYRIGHT_CS, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_COPYRIGHT_CS, x, y, COLOUR_BLACK, nullptr);
     y += 84;
-    gfx_draw_string_centred(dpi, STR_DESIGNED_AND_PROGRAMMED_BY_CS, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_DESIGNED_AND_PROGRAMMED_BY_CS, x, y, COLOUR_BLACK, nullptr);
     y += 10;
-    gfx_draw_string_centred(dpi, STR_GRAPHICS_BY_SF, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_GRAPHICS_BY_SF, x, y, COLOUR_BLACK, nullptr);
     y += 10;
-    gfx_draw_string_centred(dpi, STR_SOUND_AND_MUSIC_BY_AB, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_SOUND_AND_MUSIC_BY_AB, x, y, COLOUR_BLACK, nullptr);
     y += 10;
-    gfx_draw_string_centred(dpi, STR_ADDITIONAL_SOUNDS_RECORDED_BY_DE, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_ADDITIONAL_SOUNDS_RECORDED_BY_DE, x, y, COLOUR_BLACK, nullptr);
     y += 13;
-    gfx_draw_string_centred(dpi, STR_REPRESENTATION_BY_JL, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_REPRESENTATION_BY_JL, x, y, COLOUR_BLACK, nullptr);
     y += 25;
-    gfx_draw_string_centred(dpi, STR_THANKS_TO, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_THANKS_TO, x, y, COLOUR_BLACK, nullptr);
     y += 10;
-    gfx_draw_string_centred(dpi, STR_THANKS_TO_PEOPLE, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_THANKS_TO_PEOPLE, x, y, COLOUR_BLACK, nullptr);
     y += 25;
-    gfx_draw_string_centred(dpi, STR_LICENSED_TO_INFOGRAMES_INTERACTIVE_INC, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_LICENSED_TO_INFOGRAMES_INTERACTIVE_INC, x, y, COLOUR_BLACK, nullptr);
 
     // Images
     gfx_draw_sprite(dpi, SPR_CREDITS_CHRIS_SAWYER_SMALL, w->x + 92, yPage + 24, 0);
diff --git a/src/openrct2-ui/windows/Changelog.cpp b/src/openrct2-ui/windows/Changelog.cpp
index 45ca9ed36c..752f5bd0ef 100644
--- a/src/openrct2-ui/windows/Changelog.cpp
+++ b/src/openrct2-ui/windows/Changelog.cpp
@@ -61,28 +61,28 @@ static rct_window_event_list window_changelog_events = {
     window_changelog_close,
     window_changelog_mouseup,
     window_changelog_resize,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_changelog_scrollgetsize,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_changelog_invalidate,
     window_changelog_paint,
     window_changelog_scrollpaint
@@ -91,9 +91,9 @@ static rct_window_event_list window_changelog_events = {
 static bool window_changelog_read_file();
 static void window_changelog_dispose_file();
 
-static char *_changelogText = NULL;
+static char *_changelogText = nullptr;
 static size_t _changelogTextSize = 0;
-static char **_changelogLines = NULL;
+static char **_changelogLines = nullptr;
 static sint32 _changelogNumLines = 0;
 static sint32 _changelogLongestLineWidth = 0;
 
@@ -102,11 +102,11 @@ rct_window * window_changelog_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_CHANGELOG);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     if (!window_changelog_read_file())
-        return NULL;
+        return nullptr;
 
     sint32 screenWidth = context_get_width();
     sint32 screenHeight = context_get_height();
@@ -210,7 +210,7 @@ static bool window_changelog_read_file()
         return false;
     }
     void* new_memory = realloc(_changelogText, _changelogTextSize + 1);
-    if (new_memory == NULL) {
+    if (new_memory == nullptr) {
         log_error("Failed to reallocate memory for changelog text");
         return false;
     }
@@ -235,7 +235,7 @@ static bool window_changelog_read_file()
             if (_changelogNumLines > changelogLinesCapacity) {
                 changelogLinesCapacity *= 2;
                 new_memory = realloc(_changelogLines, changelogLinesCapacity * sizeof(char*));
-                if (new_memory == NULL) {
+                if (new_memory == nullptr) {
                     log_error("Failed to reallocate memory for change log lines");
                     return false;
                 }
@@ -251,7 +251,7 @@ static bool window_changelog_read_file()
     }
 
     new_memory = realloc(_changelogLines, _changelogNumLines * sizeof(char*));
-    if (new_memory == NULL) {
+    if (new_memory == nullptr) {
         log_error("Failed to reallocate memory for change log lines");
         return false;
     }
diff --git a/src/openrct2-ui/windows/Cheats.cpp b/src/openrct2-ui/windows/Cheats.cpp
index a5450e06c2..1a4dd3e1a3 100644
--- a/src/openrct2-ui/windows/Cheats.cpp
+++ b/src/openrct2-ui/windows/Cheats.cpp
@@ -306,127 +306,127 @@ static void window_cheats_set_page(rct_window *w, sint32 page);
 static void window_cheats_text_input(rct_window *w, rct_widgetindex widgetIndex, char *text);
 
 static rct_window_event_list window_cheats_money_events = {
-    NULL,
+    nullptr,
     window_cheats_money_mouseup,
-    NULL,
+    nullptr,
     window_cheats_money_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_cheats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_text_input,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_invalidate,
     window_cheats_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_cheats_guests_events = {
-    NULL,
+    nullptr,
     window_cheats_guests_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_invalidate,
     window_cheats_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_cheats_misc_events = {
-    NULL,
+    nullptr,
     window_cheats_misc_mouseup,
-    NULL,
+    nullptr,
     window_cheats_misc_mousedown,
     window_cheats_misc_dropdown,
-    NULL,
+    nullptr,
     window_cheats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_invalidate,
     window_cheats_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_cheats_rides_events = {
-    NULL,
+    nullptr,
     window_cheats_rides_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_cheats_invalidate,
     window_cheats_paint,
-    NULL
+    nullptr
 };
 
 
@@ -484,7 +484,7 @@ rct_window * window_cheats_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_CHEATS);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create(32, 32, WW, WH, &window_cheats_money_events, WC_CHEATS, 0);
@@ -841,7 +841,7 @@ static void window_cheats_rides_mouseup(rct_window *w, rct_widgetindex widgetInd
 }
 
 static void window_cheats_text_input(rct_window *w, rct_widgetindex widgetIndex, char *text) {
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     if (w->page == WINDOW_CHEATS_PAGE_MONEY && widgetIndex == WIDX_MONEY_SPINNER) {
@@ -942,19 +942,19 @@ static void window_cheats_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left(dpi, STR_BOTTOM_TOOLBAR_CASH, gCommonFormatArgs, colour, w->x + XPL(0) + TXTO, w->y + YPL(2) + TXTO);
     }
     else if(w->page == WINDOW_CHEATS_PAGE_MISC){
-        gfx_draw_string_left(dpi, STR_CHEAT_STAFF_SPEED,            NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(17) + TXTO);
-        gfx_draw_string_left(dpi, STR_FORCE_WEATHER,                NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(10) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_STAFF_SPEED,            nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(17) + TXTO);
+        gfx_draw_string_left(dpi, STR_FORCE_WEATHER,                nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(10) + TXTO);
         gfx_draw_string_right(dpi, STR_FORMAT_INTEGER,      &park_rating_spinner_value, w->colours[1], w->x + WPL(1) - 10 - TXTO, w->y + YPL(5) + TXTO);
     }
     else if (w->page == WINDOW_CHEATS_PAGE_GUESTS){
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_HAPPINESS,        NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(1) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_ENERGY,           NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(2) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_HUNGER,           NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(3) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_THIRST,           NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(4) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_NAUSEA,           NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(5) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_NAUSEA_TOLERANCE, NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(6) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_BATHROOM,         NULL,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(7) + TXTO);
-        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_PREFERRED_INTENSITY,NULL, COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(8) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_HAPPINESS,        nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(1) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_ENERGY,           nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(2) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_HUNGER,           nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(3) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_THIRST,           nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(4) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_NAUSEA,           nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(5) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_NAUSEA_TOLERANCE, nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(6) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_BATHROOM,         nullptr,   COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(7) + TXTO);
+        gfx_draw_string_left(dpi, STR_CHEAT_GUEST_PREFERRED_INTENSITY,nullptr, COLOUR_BLACK, w->x + XPL(0) + TXTO, w->y + YPL(8) + TXTO);
     }
 }
 
diff --git a/src/openrct2-ui/windows/ClearScenery.cpp b/src/openrct2-ui/windows/ClearScenery.cpp
index 44d02144e3..9f3290c9bc 100644
--- a/src/openrct2-ui/windows/ClearScenery.cpp
+++ b/src/openrct2-ui/windows/ClearScenery.cpp
@@ -64,32 +64,32 @@ static void window_clear_scenery_inputsize(rct_window *w);
 static rct_window_event_list window_clear_scenery_events = {
     window_clear_scenery_close,
     window_clear_scenery_mouseup,
-    NULL,
+    nullptr,
     window_clear_scenery_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_clear_scenery_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_clear_scenery_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_clear_scenery_invalidate,
     window_clear_scenery_paint,
-    NULL
+    nullptr
 };
 
 /**
@@ -102,7 +102,7 @@ rct_window * window_clear_scenery_open()
 
     // Check if window is already open
     window = window_find_by_class(WC_CLEAR_SCENERY);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create(context_get_width() - 98, 29, 98, 94, &window_clear_scenery_events, WC_CLEAR_SCENERY, 0);
@@ -187,7 +187,7 @@ static void window_clear_scenery_textinput(rct_window *w, rct_widgetindex widget
     sint32 size;
     char* end;
 
-    if (widgetIndex != WIDX_PREVIEW || text == NULL)
+    if (widgetIndex != WIDX_PREVIEW || text == nullptr)
         return;
 
     size = strtol(text, &end, 10);
diff --git a/src/openrct2-ui/windows/CustomCurrency.cpp b/src/openrct2-ui/windows/CustomCurrency.cpp
index 19d765e543..5d69cf4db0 100644
--- a/src/openrct2-ui/windows/CustomCurrency.cpp
+++ b/src/openrct2-ui/windows/CustomCurrency.cpp
@@ -58,34 +58,34 @@ static void custom_currency_window_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 
 static rct_window_event_list _windowCustomCurrencyEvents = {
-    NULL,
+    nullptr,
     custom_currency_window_mouseup,
-    NULL,
+    nullptr,
     custom_currency_window_mousedown,
     custom_currency_window_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     custom_currency_window_text_input,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     custom_currency_window_paint,
-    NULL
+    nullptr
 };
 
 
@@ -95,7 +95,7 @@ rct_window * custom_currency_window_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_CUSTOM_CURRENCY_CONFIG);
-    if(window != NULL)
+    if(window != nullptr)
         return window;
 
     window = window_create_centred(
@@ -235,7 +235,7 @@ static void custom_currency_window_dropdown(rct_window *w, rct_widgetindex widge
 
 static void custom_currency_window_text_input(struct rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL)
+    if (text == nullptr)
         return;
     sint32 rate;
     char* end;
@@ -281,7 +281,7 @@ static void custom_currency_window_paint(rct_window *w, rct_drawpixelinfo *dpi)
     x = w->x + 10;
     y = w->y + 30;
 
-    gfx_draw_string_left(dpi, STR_RATE, NULL, w->colours[1], x, y);
+    gfx_draw_string_left(dpi, STR_RATE, nullptr, w->colours[1], x, y);
 
     sint32 baseExchange = CurrencyDescriptors[CURRENCY_POUNDS].rate;
     set_format_arg(0, sint32, baseExchange);
@@ -289,7 +289,7 @@ static void custom_currency_window_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     y += 20;
 
-    gfx_draw_string_left(dpi, STR_CURRENCY_SYMBOL_TEXT, NULL, w->colours[1], x, y);
+    gfx_draw_string_left(dpi, STR_CURRENCY_SYMBOL_TEXT, nullptr, w->colours[1], x, y);
 
     gfx_draw_string(
         dpi,
diff --git a/src/openrct2-ui/windows/DebugPaint.cpp b/src/openrct2-ui/windows/DebugPaint.cpp
index 929b70f8c1..bc8439befc 100644
--- a/src/openrct2-ui/windows/DebugPaint.cpp
+++ b/src/openrct2-ui/windows/DebugPaint.cpp
@@ -49,34 +49,34 @@ static void window_debug_paint_invalidate(rct_window * w);
 static void window_debug_paint_paint(rct_window * w, rct_drawpixelinfo * dpi);
 
 static rct_window_event_list window_debug_paint_events = {
-    NULL,
+    nullptr,
     window_debug_paint_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_debug_paint_invalidate,
     window_debug_paint_paint,
-    NULL
+    nullptr
 };
 
 rct_window * window_debug_paint_open()
@@ -85,7 +85,7 @@ rct_window * window_debug_paint_open()
 
     // Check if window is already open
     window = window_find_by_class(WC_DEBUG_PAINT);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create(
diff --git a/src/openrct2-ui/windows/EditorInventionsList.cpp b/src/openrct2-ui/windows/EditorInventionsList.cpp
index 51d062b77f..e44642d211 100644
--- a/src/openrct2-ui/windows/EditorInventionsList.cpp
+++ b/src/openrct2-ui/windows/EditorInventionsList.cpp
@@ -93,29 +93,29 @@ static void window_editor_inventions_list_drag_paint(rct_window *w, rct_drawpixe
 static rct_window_event_list window_editor_inventions_list_events = {
     window_editor_inventions_list_close,
     window_editor_inventions_list_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_inventions_list_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_inventions_list_scrollgetheight,
     window_editor_inventions_list_scrollmousedown,
-    NULL,
+    nullptr,
     window_editor_inventions_list_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_inventions_list_tooltip,
     window_editor_inventions_list_cursor,
-    NULL,
+    nullptr,
     window_editor_inventions_list_invalidate,
     window_editor_inventions_list_paint,
     window_editor_inventions_list_scrollpaint
@@ -123,34 +123,34 @@ static rct_window_event_list window_editor_inventions_list_events = {
 
 // 0x009817EC
 static rct_window_event_list window_editor_inventions_list_drag_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_inventions_list_drag_cursor,
     window_editor_inventions_list_drag_moved,
-    NULL,
+    nullptr,
     window_editor_inventions_list_drag_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -214,7 +214,7 @@ static void research_rides_setup(){
 
             for (uint8 rideType = 0; rideType < object_entry_group_counts[OBJECT_TYPE_RIDE]; rideType++){
                 rct_ride_entry* master_ride = get_ride_entry(rideType);
-                if (master_ride == NULL || (intptr_t)master_ride == -1)
+                if (master_ride == nullptr || (intptr_t)master_ride == -1)
                     continue;
 
                 if (master_ride->flags & RIDE_ENTRY_FLAG_SEPARATE_RIDE)
@@ -258,7 +258,7 @@ static void research_rides_setup(){
         research->entryIndex |= RESEARCH_ENTRY_FLAG_RIDE_ALWAYS_RESEARCHED;
         _editorInventionsListDraggedItem = research;
         move_research_item(gResearchItems);
-        _editorInventionsListDraggedItem = NULL;
+        _editorInventionsListDraggedItem = nullptr;
         research--;
     }
 }
@@ -289,7 +289,7 @@ static void research_scenery_sets_setup(){
             research->entryIndex |= RESEARCH_ENTRY_FLAG_SCENERY_SET_ALWAYS_RESEARCHED;
             _editorInventionsListDraggedItem = research;
             move_research_item(gResearchItems);
-            _editorInventionsListDraggedItem = NULL;
+            _editorInventionsListDraggedItem = nullptr;
         }
     }
 }
@@ -330,14 +330,14 @@ static rct_string_id research_item_get_name(uint32 researchItem)
 {
     if (researchItem < 0x10000) {
         rct_scenery_set_entry *sceneryEntry = get_scenery_group_entry(researchItem & 0xFF);
-        if (sceneryEntry == NULL || sceneryEntry == (rct_scenery_set_entry*)-1)
+        if (sceneryEntry == nullptr || sceneryEntry == (rct_scenery_set_entry*)-1)
             return 0;
 
         return sceneryEntry->name;
     }
 
     rct_ride_entry *rideEntry = get_ride_entry(researchItem & 0xFF);
-    if (rideEntry == NULL || rideEntry == (rct_ride_entry*)-1)
+    if (rideEntry == nullptr || rideEntry == (rct_ride_entry*)-1)
         return 0;
 
     if (rideEntry->flags & RIDE_ENTRY_FLAG_SEPARATE_RIDE_NAME)
@@ -454,8 +454,8 @@ static void move_research_item(rct_research_item *beforeItem)
     *researchItem = draggedItem;
 
     w = window_find_by_class(WC_EDITOR_INVENTION_LIST);
-    if (w != NULL) {
-        w->research_item = NULL;
+    if (w != nullptr) {
+        w->research_item = nullptr;
         window_invalidate(w);
     }
 }
@@ -482,7 +482,7 @@ static rct_research_item *window_editor_inventions_list_get_item_from_scroll_y(s
             return researchItem;
     }
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -513,7 +513,7 @@ static rct_research_item *window_editor_inventions_list_get_item_from_scroll_y_i
 static rct_research_item *get_research_item_at(sint32 x, sint32 y)
 {
     rct_window *w = window_find_by_class(WC_EDITOR_INVENTION_LIST);
-    if (w != NULL && w->x <= x && w->y < y && w->x + w->width > x && w->y + w->height > y) {
+    if (w != nullptr && w->x <= x && w->y < y && w->x + w->width > x && w->y + w->height > y) {
         rct_widgetindex widgetIndex = window_find_widget_from_point(w, x, y);
         rct_widget *widget = &w->widgets[widgetIndex];
         if (widgetIndex == WIDX_PRE_RESEARCHED_SCROLL || widgetIndex == WIDX_RESEARCH_ORDER_SCROLL) {
@@ -529,7 +529,7 @@ static rct_research_item *get_research_item_at(sint32 x, sint32 y)
         }
     }
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -541,7 +541,7 @@ rct_window * window_editor_inventions_list_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_EDITOR_INVENTION_LIST);
-    if (w != NULL)
+    if (w != nullptr)
         return w;
 
     research_always_researched_setup();
@@ -563,8 +563,8 @@ rct_window * window_editor_inventions_list_open()
     window_init_scroll_widgets(w);
     w->var_4AE = 0;
     w->selected_tab = 0;
-    w->research_item = NULL;
-    _editorInventionsListDraggedItem = NULL;
+    w->research_item = nullptr;
+    _editorInventionsListDraggedItem = nullptr;
 
     return w;
 }
@@ -622,13 +622,13 @@ static void window_editor_inventions_list_update(rct_window *w)
     window_event_invalidate_call(w);
     widget_invalidate(w, WIDX_TAB_1);
 
-    if (_editorInventionsListDraggedItem == NULL)
+    if (_editorInventionsListDraggedItem == nullptr)
         return;
 
-    if (window_find_by_class(WC_EDITOR_INVENTION_LIST_DRAG) != NULL)
+    if (window_find_by_class(WC_EDITOR_INVENTION_LIST_DRAG) != nullptr)
         return;
 
-    _editorInventionsListDraggedItem = NULL;
+    _editorInventionsListDraggedItem = nullptr;
     window_invalidate(w);
 }
 
@@ -665,7 +665,7 @@ static void window_editor_inventions_list_scrollmousedown(rct_window *w, sint32
     rct_research_item *researchItem;
 
     researchItem = window_editor_inventions_list_get_item_from_scroll_y(scrollIndex, y);
-    if (researchItem == NULL)
+    if (researchItem == nullptr)
         return;
 
     if (researchItem->entryIndex < RESEARCHED_ITEMS_END_2 && research_item_is_always_researched(researchItem))
@@ -720,7 +720,7 @@ static void window_editor_inventions_list_cursor(rct_window *w, rct_widgetindex
     }
 
     researchItem = window_editor_inventions_list_get_item_from_scroll_y(scrollIndex, y);
-    if (researchItem == NULL)
+    if (researchItem == nullptr)
         return;
 
     if (researchItem->entryIndex < RESEARCHED_ITEMS_END_2 && research_item_is_always_researched(researchItem)) {
@@ -764,12 +764,12 @@ static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo
     // Pre-researched items label
     x = w->x + w->widgets[WIDX_PRE_RESEARCHED_SCROLL].left;
     y = w->y + w->widgets[WIDX_PRE_RESEARCHED_SCROLL].top - 11;
-    gfx_draw_string_left(dpi, STR_INVENTION_PREINVENTED_ITEMS, NULL, COLOUR_BLACK, x, y - 1);
+    gfx_draw_string_left(dpi, STR_INVENTION_PREINVENTED_ITEMS, nullptr, COLOUR_BLACK, x, y - 1);
 
     // Research order label
     x = w->x + w->widgets[WIDX_RESEARCH_ORDER_SCROLL].left;
     y = w->y + w->widgets[WIDX_RESEARCH_ORDER_SCROLL].top - 11;
-    gfx_draw_string_left(dpi, STR_INVENTION_TO_BE_INVENTED_ITEMS, NULL, COLOUR_BLACK, x, y - 1);
+    gfx_draw_string_left(dpi, STR_INVENTION_TO_BE_INVENTED_ITEMS, nullptr, COLOUR_BLACK, x, y - 1);
 
     // Preview background
     widget = &w->widgets[WIDX_PREVIEW];
@@ -783,10 +783,10 @@ static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo
     );
 
     researchItem = _editorInventionsListDraggedItem;
-    if (researchItem == NULL)
+    if (researchItem == nullptr)
         researchItem = w->research_item;
     // If the research item is null or a list separator.
-    if (researchItem == NULL || researchItem->entryIndex < 0)
+    if (researchItem == nullptr || researchItem->entryIndex < 0)
         return;
 
     // Preview image
@@ -797,7 +797,7 @@ static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo
 
     void *chunk = object_entry_groups[objectEntryType].chunks[researchItem->entryIndex & 0xFF];
 
-    if (chunk == NULL || chunk == (void*)-1)
+    if (chunk == nullptr || chunk == (void*)-1)
         return;
 
     rct_object_entry * entry = &object_entry_groups[objectEntryType].entries[researchItem->entryIndex & 0xFF].entry;
@@ -806,7 +806,7 @@ static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo
     widget = &w->widgets[WIDX_PREVIEW];
 
     void * object = object_manager_get_loaded_object(entry);
-    if (object != NULL) {
+    if (object != nullptr) {
         rct_drawpixelinfo clipDPI;
         x = w->x + widget->left + 1;
         y = w->y + widget->top + 1;
@@ -867,7 +867,7 @@ static void window_editor_inventions_list_scrollpaint(rct_window *w, rct_drawpix
 
         uint8 colour = COLOUR_BRIGHT_GREEN | COLOUR_FLAG_TRANSLUCENT;
         if (w->research_item == researchItem) {
-            if (_editorInventionsListDraggedItem == NULL) {
+            if (_editorInventionsListDraggedItem == nullptr) {
                 // Highlight
                 top = itemY;
                 bottom = itemY + 9;
@@ -878,7 +878,7 @@ static void window_editor_inventions_list_scrollpaint(rct_window *w, rct_drawpix
             }
             gfx_filter_rect(dpi, 0, top, w->width, bottom, PALETTE_DARKEN_1);
 
-            if (_editorInventionsListDraggedItem == NULL)
+            if (_editorInventionsListDraggedItem == nullptr)
                 colour = COLOUR_BRIGHT_GREEN;
         }
 
@@ -896,11 +896,11 @@ static void window_editor_inventions_list_scrollpaint(rct_window *w, rct_drawpix
             ptr = utf8_write_codepoint(ptr, colour);
         }
 
-        format_string(ptr, 256, stringId, NULL);
+        format_string(ptr, 256, stringId, nullptr);
 
         if (disableItemMovement) {
             gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM_DARK;
-            if (colour == COLOUR_BRIGHT_GREEN && _editorInventionsListDraggedItem == NULL) {
+            if (colour == COLOUR_BRIGHT_GREEN && _editorInventionsListDraggedItem == nullptr) {
                 gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM_EXTRA_DARK;
             }
             colour = COLOUR_FLAG_INSET | w->colours[1];
@@ -932,7 +932,7 @@ static void window_editor_inventions_list_drag_open(rct_research_item *researchI
     _editorInventionsListDraggedItem = researchItem;
 
     stringId = research_item_get_name(researchItem->entryIndex & 0xFFFFFF);
-    format_string(buffer, 256, stringId, NULL);
+    format_string(buffer, 256, stringId, nullptr);
     stringWidth = gfx_get_string_width(buffer);
     window_editor_inventions_list_drag_widgets[0].right = stringWidth;
 
@@ -957,7 +957,7 @@ static void window_editor_inventions_list_drag_open(rct_research_item *researchI
 static void window_editor_inventions_list_drag_cursor(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y, sint32 *cursorId)
 {
     rct_window *inventionListWindow = window_find_by_class(WC_EDITOR_INVENTION_LIST);
-    if (inventionListWindow != NULL) {
+    if (inventionListWindow != nullptr) {
         rct_research_item *researchItem = get_research_item_at(x, y);
         if (researchItem != inventionListWindow->research_item) {
             inventionListWindow = (rct_window *)researchItem;
@@ -977,11 +977,11 @@ static void window_editor_inventions_list_drag_moved(rct_window* w, sint32 x, si
     rct_research_item *researchItem;
 
     researchItem = get_research_item_at(x, y);
-    if (researchItem != NULL)
+    if (researchItem != nullptr)
         move_research_item(researchItem);
 
     window_close(w);
-    _editorInventionsListDraggedItem = NULL;
+    _editorInventionsListDraggedItem = nullptr;
     window_invalidate_by_class(WC_EDITOR_INVENTION_LIST);
 }
 
diff --git a/src/openrct2-ui/windows/EditorObjectiveOptions.cpp b/src/openrct2-ui/windows/EditorObjectiveOptions.cpp
index 6ec1005137..50a0b903a3 100644
--- a/src/openrct2-ui/windows/EditorObjectiveOptions.cpp
+++ b/src/openrct2-ui/windows/EditorObjectiveOptions.cpp
@@ -151,63 +151,63 @@ static void window_editor_objective_options_rides_scrollpaint(rct_window *w, rct
 
 // 0x009A9DF4
 static rct_window_event_list window_objective_options_main_events = {
-    NULL,
+    nullptr,
     window_editor_objective_options_main_mouseup,
     window_editor_objective_options_main_resize,
     window_editor_objective_options_main_mousedown,
     window_editor_objective_options_main_dropdown,
-    NULL,
+    nullptr,
     window_editor_objective_options_main_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_objective_options_main_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_objective_options_main_invalidate,
     window_editor_objective_options_main_paint,
-    NULL
+    nullptr
 };
 
 // 0x009A9F58
 static rct_window_event_list window_objective_options_rides_events = {
-    NULL,
+    nullptr,
     window_editor_objective_options_rides_mouseup,
     window_editor_objective_options_rides_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_objective_options_rides_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_objective_options_rides_scrollgetheight,
     window_editor_objective_options_rides_scrollmousedown,
-    NULL,
+    nullptr,
     window_editor_objective_options_rides_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_objective_options_rides_invalidate,
     window_editor_objective_options_rides_paint,
     window_editor_objective_options_rides_scrollpaint
@@ -267,7 +267,7 @@ rct_window * window_editor_objective_options_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_EDTIOR_OBJECTIVE_OPTIONS);
-    if (w != NULL)
+    if (w != nullptr)
         return w;
 
     w = window_create_centred(
@@ -789,7 +789,7 @@ static void window_editor_objective_options_main_update(rct_window *w)
  */
 static void window_editor_objective_options_main_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     switch (widgetIndex) {
@@ -831,7 +831,7 @@ static void window_editor_objective_options_main_invalidate(rct_window *w)
 
     stex = g_stexEntries[0];
     if (stex == (rct_stex_entry*)-1)
-        stex = NULL;
+        stex = nullptr;
 
     widgets = window_editor_objective_options_widgets[w->page];
     if (w->widgets != widgets) {
@@ -841,7 +841,7 @@ static void window_editor_objective_options_main_invalidate(rct_window *w)
 
     window_editor_objective_options_set_pressed_tab(w);
 
-    if (stex == NULL)
+    if (stex == nullptr)
         w->disabled_widgets &= ~((1 << WIDX_PARK_NAME) | (1 << WIDX_SCENARIO_NAME));
     else
         w->disabled_widgets |= ((1 << WIDX_PARK_NAME) | (1 << WIDX_SCENARIO_NAME));
@@ -901,12 +901,12 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
 
     stex = g_stexEntries[0];
     if (stex == (rct_stex_entry*)-1)
-        stex = NULL;
+        stex = nullptr;
 
     // Objective label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_OBJECTIVE].top;
-    gfx_draw_string_left(dpi, STR_OBJECTIVE_WINDOW, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_OBJECTIVE_WINDOW, nullptr, COLOUR_BLACK, x, y);
 
     // Objective value
     x = w->x + w->widgets[WIDX_OBJECTIVE].left + 1;
@@ -940,7 +940,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
             stringId = STR_WINDOW_OBJECTIVE_EXCITEMENT_RATING;
             break;
         }
-        gfx_draw_string_left(dpi, stringId, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, stringId, nullptr, COLOUR_BLACK, x, y);
 
         // Objective argument 1 value
         x = w->x + w->widgets[WIDX_OBJECTIVE_ARG_1].left + 1;
@@ -974,7 +974,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
         // Objective argument 2 label
         x = w->x + 28;
         y = w->y + w->widgets[WIDX_OBJECTIVE_ARG_2].top;
-        gfx_draw_string_left(dpi, STR_WINDOW_OBJECTIVE_DATE, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_WINDOW_OBJECTIVE_DATE, nullptr, COLOUR_BLACK, x, y);
 
         // Objective argument 2 value
         x = w->x + w->widgets[WIDX_OBJECTIVE_ARG_2].left + 1;
@@ -986,7 +986,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
     // Climate label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_CLIMATE].top;
-    gfx_draw_string_left(dpi, STR_CLIMATE_LABEL, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_CLIMATE_LABEL, nullptr, COLOUR_BLACK, x, y);
 
     // Climate value
     x = w->x + w->widgets[WIDX_CLIMATE].left + 1;
@@ -999,7 +999,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
     y = w->y + w->widgets[WIDX_PARK_NAME].top;
     width = w->widgets[WIDX_PARK_NAME].left - 16;
 
-    if (stex != NULL) {
+    if (stex != nullptr) {
         set_format_arg(0, rct_string_id, stex->park_name);
     } else {
         set_format_arg(0, rct_string_id, gParkName);
@@ -1012,7 +1012,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
     y = w->y + w->widgets[WIDX_SCENARIO_NAME].top;
     width = w->widgets[WIDX_SCENARIO_NAME].left - 16;
 
-    if (stex != NULL) {
+    if (stex != nullptr) {
         set_format_arg(0, rct_string_id, stex->scenario_name);
         set_format_arg(2, uint32, gParkNameArgs);
     } else {
@@ -1025,14 +1025,14 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
     // Scenario details label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_DETAILS].top;
-    gfx_draw_string_left(dpi, STR_WINDOW_PARK_DETAILS, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_WINDOW_PARK_DETAILS, nullptr, COLOUR_BLACK, x, y);
 
     // Scenario details value
     x = w->x + 16;
     y = w->y + w->widgets[WIDX_DETAILS].top + 10;
     width = w->widgets[WIDX_DETAILS].left - 4;
 
-    if (stex != NULL) {
+    if (stex != nullptr) {
         set_format_arg(0, rct_string_id, stex->details);
         set_format_arg(2, uint32, gParkNameArgs);
     } else {
@@ -1044,7 +1044,7 @@ static void window_editor_objective_options_main_paint(rct_window *w, rct_drawpi
     // Scenario category label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_CATEGORY].top;
-    gfx_draw_string_left(dpi, STR_WINDOW_SCENARIO_GROUP, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_WINDOW_SCENARIO_GROUP, nullptr, COLOUR_BLACK, x, y);
 
     // Scenario category value
     x = w->x + w->widgets[WIDX_CATEGORY].left + 1;
@@ -1182,7 +1182,7 @@ static void window_editor_objective_options_rides_paint(rct_window *w, rct_drawp
     window_draw_widgets(w, dpi);
     window_editor_objective_options_draw_tab_images(w, dpi);
 
-    gfx_draw_string_left(dpi, STR_WINDOW_PRESERVATION_ORDER, NULL, COLOUR_BLACK, w->x + 6, w->y + w->widgets[WIDX_PAGE_BACKGROUND].top + 3);
+    gfx_draw_string_left(dpi, STR_WINDOW_PRESERVATION_ORDER, nullptr, COLOUR_BLACK, w->x + 6, w->y + w->widgets[WIDX_PAGE_BACKGROUND].top + 3);
 }
 
 /**
diff --git a/src/openrct2-ui/windows/EditorScenarioOptions.cpp b/src/openrct2-ui/windows/EditorScenarioOptions.cpp
index eb62ba07ae..fae6d34ef0 100644
--- a/src/openrct2-ui/windows/EditorScenarioOptions.cpp
+++ b/src/openrct2-ui/windows/EditorScenarioOptions.cpp
@@ -209,98 +209,98 @@ static void window_editor_scenario_options_park_paint(rct_window *w, rct_drawpix
 
 // 0x0097EB60
 static rct_window_event_list window_scenario_options_financial_events = {
-    NULL,
+    nullptr,
     window_editor_scenario_options_financial_mouseup,
     window_editor_scenario_options_financial_resize,
     window_editor_scenario_options_financial_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_editor_scenario_options_financial_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_scenario_options_financial_invalidate,
     window_editor_scenario_options_financial_paint,
-    NULL
+    nullptr
 };
 
 // 0x0097EBD0
 static rct_window_event_list window_scenario_options_guests_events = {
-    NULL,
+    nullptr,
     window_editor_scenario_options_guests_mouseup,
     window_editor_scenario_options_guests_resize,
     window_editor_scenario_options_guests_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_editor_scenario_options_guests_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_scenario_options_guests_invalidate,
     window_editor_scenario_options_guests_paint,
-    NULL
+    nullptr
 };
 
 // 0x0097EC40
 static rct_window_event_list window_scenario_options_park_events = {
-    NULL,
+    nullptr,
     window_editor_scenario_options_park_mouseup,
     window_editor_scenario_options_park_resize,
     window_editor_scenario_options_park_mousedown,
     window_editor_scenario_options_park_dropdown,
-    NULL,
+    nullptr,
     window_editor_scenario_options_park_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_scenario_options_park_invalidate,
     window_editor_scenario_options_park_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_editor_scenario_options_page_events[] = {
@@ -394,7 +394,7 @@ rct_window * window_editor_scenario_options_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_EDITOR_SCENARIO_OPTIONS);
-    if (w != NULL)
+    if (w != nullptr)
         return w;
 
     w = window_create_centred(
@@ -791,7 +791,7 @@ static void window_editor_scenario_options_financial_paint(rct_window *w, rct_dr
     if (w->widgets[WIDX_INITIAL_CASH].type != WWT_EMPTY) {
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_INITIAL_CASH].top;
-        gfx_draw_string_left(dpi, STR_INIT_CASH_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_INIT_CASH_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         x = w->x + w->widgets[WIDX_INITIAL_CASH].left + 1;
         y = w->y + w->widgets[WIDX_INITIAL_CASH].top;
@@ -801,7 +801,7 @@ static void window_editor_scenario_options_financial_paint(rct_window *w, rct_dr
     if (w->widgets[WIDX_INITIAL_LOAN].type != WWT_EMPTY) {
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_INITIAL_LOAN].top;
-        gfx_draw_string_left(dpi, STR_INIT_LOAN_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_INIT_LOAN_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         x = w->x + w->widgets[WIDX_INITIAL_LOAN].left + 1;
         y = w->y + w->widgets[WIDX_INITIAL_LOAN].top;
@@ -811,7 +811,7 @@ static void window_editor_scenario_options_financial_paint(rct_window *w, rct_dr
     if (w->widgets[WIDX_MAXIMUM_LOAN].type != WWT_EMPTY) {
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_MAXIMUM_LOAN].top;
-        gfx_draw_string_left(dpi, STR_MAX_LOAN_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_MAX_LOAN_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         x = w->x + w->widgets[WIDX_MAXIMUM_LOAN].left + 1;
         y = w->y + w->widgets[WIDX_MAXIMUM_LOAN].top;
@@ -821,7 +821,7 @@ static void window_editor_scenario_options_financial_paint(rct_window *w, rct_dr
     if (w->widgets[WIDX_INTEREST_RATE].type != WWT_EMPTY) {
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_INTEREST_RATE].top;
-        gfx_draw_string_left(dpi, STR_INTEREST_RATE_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_INTEREST_RATE_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         x = w->x + w->widgets[WIDX_INTEREST_RATE].left + 1;
         y = w->y + w->widgets[WIDX_INTEREST_RATE].top;
@@ -1094,7 +1094,7 @@ static void window_editor_scenario_options_guests_paint(rct_window *w, rct_drawp
         // Cash per guest label
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_CASH_PER_GUEST].top;
-        gfx_draw_string_left(dpi, STR_CASH_PER_GUEST_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_CASH_PER_GUEST_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         // Cash per guest value
         x = w->x + w->widgets[WIDX_CASH_PER_GUEST].left + 1;
@@ -1106,7 +1106,7 @@ static void window_editor_scenario_options_guests_paint(rct_window *w, rct_drawp
     // Guest initial happiness label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_GUEST_INITIAL_HAPPINESS].top;
-    gfx_draw_string_left(dpi, STR_GUEST_INIT_HAPPINESS, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_INIT_HAPPINESS, nullptr, COLOUR_BLACK, x, y);
 
     // Guest initial happiness value
     x = w->x + w->widgets[WIDX_GUEST_INITIAL_HAPPINESS].left + 1;
@@ -1117,7 +1117,7 @@ static void window_editor_scenario_options_guests_paint(rct_window *w, rct_drawp
     // Guest initial hunger label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_GUEST_INITIAL_HUNGER].top;
-    gfx_draw_string_left(dpi, STR_GUEST_INIT_HUNGER, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_INIT_HUNGER, nullptr, COLOUR_BLACK, x, y);
 
     // Guest initial hunger value
     x = w->x + w->widgets[WIDX_GUEST_INITIAL_HUNGER].left + 1;
@@ -1128,7 +1128,7 @@ static void window_editor_scenario_options_guests_paint(rct_window *w, rct_drawp
     // Guest initial thirst label
     x = w->x + 8;
     y = w->y + w->widgets[WIDX_GUEST_INITIAL_THIRST].top;
-    gfx_draw_string_left(dpi, STR_GUEST_INIT_THIRST, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_INIT_THIRST, nullptr, COLOUR_BLACK, x, y);
 
     // Guest initial thirst value
     x = w->x + w->widgets[WIDX_GUEST_INITIAL_THIRST].left + 1;
@@ -1471,7 +1471,7 @@ static void window_editor_scenario_options_park_paint(rct_window *w, rct_drawpix
         // Cost to buy land label
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_LAND_COST].top;
-        gfx_draw_string_left(dpi, STR_LAND_COST_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_LAND_COST_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         // Cost to buy land value
         x = w->x + w->widgets[WIDX_LAND_COST].left + 1;
@@ -1484,7 +1484,7 @@ static void window_editor_scenario_options_park_paint(rct_window *w, rct_drawpix
         // Cost to buy construction rights label
         x = w->x + 8;
         y = w->y + w->widgets[WIDX_CONSTRUCTION_RIGHTS_COST].top;
-        gfx_draw_string_left(dpi, STR_RIGHTS_COST_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_RIGHTS_COST_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         // Cost to buy construction rights value
         x = w->x + w->widgets[WIDX_CONSTRUCTION_RIGHTS_COST].left + 1;
@@ -1497,7 +1497,7 @@ static void window_editor_scenario_options_park_paint(rct_window *w, rct_drawpix
         // Pay for park or rides label
         x = w->x + w->widgets[WIDX_PAY_FOR_PARK_OR_RIDES].left + 1;
         y = w->y + w->widgets[WIDX_PAY_FOR_PARK_OR_RIDES].top;
-        gfx_draw_string_left(dpi, STR_FREE_PARK_ENTER, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_FREE_PARK_ENTER, nullptr, COLOUR_BLACK, x, y);
 
         // Pay for park or rides value
         stringId = gParkFlags & PARK_FLAGS_PARK_FREE_ENTRY ? STR_FREE_PARK_ENTER : STR_PAY_PARK_ENTER;
@@ -1508,7 +1508,7 @@ static void window_editor_scenario_options_park_paint(rct_window *w, rct_drawpix
         // Entry price label
         x = w->x + w->widgets[WIDX_PAY_FOR_PARK_OR_RIDES].right + 8;
         y = w->y + w->widgets[WIDX_ENTRY_PRICE].top;
-        gfx_draw_string_left(dpi, STR_ENTRY_PRICE_LABEL, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_ENTRY_PRICE_LABEL, nullptr, COLOUR_BLACK, x, y);
 
         // Entry price value
         x = w->x + w->widgets[WIDX_ENTRY_PRICE].left + 1;
diff --git a/src/openrct2-ui/windows/Footpath.cpp b/src/openrct2-ui/windows/Footpath.cpp
index bd09c8a530..c02848c5a0 100644
--- a/src/openrct2-ui/windows/Footpath.cpp
+++ b/src/openrct2-ui/windows/Footpath.cpp
@@ -115,32 +115,32 @@ static void window_footpath_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static rct_window_event_list window_footpath_events = {
     window_footpath_close,
     window_footpath_mouseup,
-    NULL,
+    nullptr,
     window_footpath_mousedown,
     window_footpath_dropdown,
-    NULL,
+    nullptr,
     window_footpath_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_footpath_toolupdate,
     window_footpath_tooldown,
     window_footpath_tooldrag,
     window_footpath_toolup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_footpath_invalidate,
     window_footpath_paint,
-    NULL
+    nullptr
 };
 
 static money32 _window_footpath_cost;
@@ -619,7 +619,7 @@ static void window_footpath_paint(rct_window *w, rct_drawpixelinfo *dpi)
         // Draw build this... label
         x = w->x + (window_footpath_widgets[WIDX_CONSTRUCT].left + window_footpath_widgets[WIDX_CONSTRUCT].right) / 2;
         y = w->y + window_footpath_widgets[WIDX_CONSTRUCT].bottom - 23;
-        gfx_draw_string_centred(dpi, STR_BUILD_THIS, x, y, COLOUR_BLACK, NULL);
+        gfx_draw_string_centred(dpi, STR_BUILD_THIS, x, y, COLOUR_BLACK, nullptr);
     }
 
     // Draw cost
@@ -708,7 +708,7 @@ static void window_footpath_set_provisional_path_at_point(sint32 x, sint32 y)
     sint32 interactionType;
     rct_map_element *mapElement;
     rct_xy16 mapCoord = { 0 };
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_FOOTPATH & VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_FOOTPATH & VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, nullptr);
     x = mapCoord.x;
     y = mapCoord.y;
 
@@ -806,7 +806,7 @@ static void window_footpath_place_path_at_point(sint32 x, sint32 y)
     footpath_provisional_update();
 
     rct_xy16 mapCoord = { 0 };
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_FOOTPATH & VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_FOOTPATH & VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, nullptr);
     x = mapCoord.x;
     y = mapCoord.y;
 
@@ -991,7 +991,7 @@ static rct_map_element *footpath_get_map_element_to_remove()
     x = gFootpathConstructFromPosition.x / 32;
     y = gFootpathConstructFromPosition.y / 32;
     if (x >= 256 || y >= 256)
-        return NULL;
+        return nullptr;
 
     z = (gFootpathConstructFromPosition.z >> 3) & 0xFF;
     zLow = z - 2;
@@ -1015,7 +1015,7 @@ static rct_map_element *footpath_get_map_element_to_remove()
         }
     } while (!map_element_is_last_for_tile(mapElement++));
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -1030,7 +1030,7 @@ static void window_footpath_remove()
     footpath_provisional_update();
 
     mapElement = footpath_get_map_element_to_remove();
-    if (mapElement != NULL)
+    if (mapElement != nullptr)
         footpath_remove_map_element(mapElement);
 
     window_footpath_set_enabled_and_pressed_widgets();
@@ -1043,7 +1043,7 @@ static void window_footpath_remove()
 static void window_footpath_set_enabled_and_pressed_widgets()
 {
     rct_window *w = window_find_by_class(WC_FOOTPATH);
-    if (w == NULL)
+    if (w == nullptr)
         return;
 
     if (gFootpathConstructionMode == PATH_CONSTRUCTION_MODE_BRIDGE_OR_TUNNEL) {
diff --git a/src/openrct2-ui/windows/Land.cpp b/src/openrct2-ui/windows/Land.cpp
index aeedf99f45..cd5a7dc43d 100644
--- a/src/openrct2-ui/windows/Land.cpp
+++ b/src/openrct2-ui/windows/Land.cpp
@@ -71,32 +71,32 @@ static void window_land_inputsize(rct_window *w);
 static rct_window_event_list window_land_events = {
     window_land_close,
     window_land_mouseup,
-    NULL,
+    nullptr,
     window_land_mousedown,
     window_land_dropdown,
-    NULL,
+    nullptr,
     window_land_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_land_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_land_invalidate,
     window_land_paint,
-    NULL
+    nullptr
 };
 
 static sint32 _selectedFloorTexture;
@@ -112,7 +112,7 @@ rct_window * window_land_open()
 
     // Check if window is already open
     window = window_find_by_class(WC_LAND);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create(context_get_width() - 98, 29, 98, 160, &window_land_events, WC_LAND, 0);
@@ -262,7 +262,7 @@ static void window_land_textinput(rct_window *w, rct_widgetindex widgetIndex, ch
     sint32 size;
     char* end;
 
-    if (widgetIndex != WIDX_PREVIEW || text == NULL)
+    if (widgetIndex != WIDX_PREVIEW || text == nullptr)
         return;
 
     size = strtol(text, &end, 10);
diff --git a/src/openrct2-ui/windows/LandRights.cpp b/src/openrct2-ui/windows/LandRights.cpp
index 488e0a8de8..5a7bcd4e8a 100644
--- a/src/openrct2-ui/windows/LandRights.cpp
+++ b/src/openrct2-ui/windows/LandRights.cpp
@@ -71,32 +71,32 @@ static bool land_rights_tool_is_active();
 static rct_window_event_list window_land_rights_events = {
     window_land_rights_close,
     window_land_rights_mouseup,
-    NULL,
+    nullptr,
     window_land_rights_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_land_rights_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_land_rights_toolupdate,
     window_land_rights_tooldown,
     window_land_rights_tooldrag,
-    NULL,
+    nullptr,
     window_land_rights_toolabort,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_land_rights_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_land_rights_invalidate,
     window_land_rights_paint,
-    NULL
+    nullptr
 };
 
 #define LAND_RIGHTS_MODE_BUY_CONSTRUCTION_RIGHTS 0
@@ -111,7 +111,7 @@ rct_window * window_land_rights_open()
 
     // Check if window is already open
     window = window_find_by_class(WC_LAND_RIGHTS);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create(context_get_width() - 98, 29, 98, 94, &window_land_rights_events, WC_LAND_RIGHTS, 0);
@@ -208,7 +208,7 @@ static void window_land_rights_textinput(rct_window *w, rct_widgetindex widgetIn
     sint32 size;
     char* end;
 
-    if (widgetIndex != WIDX_PREVIEW || text == NULL)
+    if (widgetIndex != WIDX_PREVIEW || text == nullptr)
         return;
 
     size = strtol(text, &end, 10);
@@ -291,7 +291,7 @@ static void window_land_rights_tool_update_land_rights(sint16 x, sint16 y)
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE;
 
     rct_xy16 mapTile = { 0 };
-    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, NULL);
+    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, nullptr);
 
     if (mapTile.x == MAP_LOCATION_NULL) {
         if (_landRightsCost != MONEY32_UNDEFINED) {
diff --git a/src/openrct2-ui/windows/Main.cpp b/src/openrct2-ui/windows/Main.cpp
index 6abedaa56b..c9a0240525 100644
--- a/src/openrct2-ui/windows/Main.cpp
+++ b/src/openrct2-ui/windows/Main.cpp
@@ -32,34 +32,34 @@ rct_widget window_main_widgets[] = {
 void window_main_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_main_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_main_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2-ui/windows/MapGen.cpp b/src/openrct2-ui/windows/MapGen.cpp
index cb856befce..7731b28a75 100644
--- a/src/openrct2-ui/windows/MapGen.cpp
+++ b/src/openrct2-ui/windows/MapGen.cpp
@@ -261,125 +261,125 @@ static void window_mapgen_heightmap_paint(rct_window *w, rct_drawpixelinfo *dpi)
 static rct_window_event_list BaseEvents = {
     window_mapgen_shared_close,
     window_mapgen_base_mouseup,
-    NULL,
+    nullptr,
     window_mapgen_base_mousedown,
     window_mapgen_base_dropdown,
-    NULL,
+    nullptr,
     window_mapgen_base_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_base_invalidate,
     window_mapgen_base_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list RandomEvents = {
     window_mapgen_shared_close,
     window_mapgen_random_mouseup,
-    NULL,
+    nullptr,
     window_mapgen_random_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_mapgen_random_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_random_invalidate,
     window_mapgen_random_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list SimplexEvents = {
     window_mapgen_shared_close,
     window_mapgen_simplex_mouseup,
-    NULL,
+    nullptr,
     window_mapgen_simplex_mousedown,
     window_mapgen_simplex_dropdown,
-    NULL,
+    nullptr,
     window_mapgen_simplex_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_simplex_invalidate,
     window_mapgen_simplex_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list HeightmapEvents = {
     window_mapgen_shared_close,
     window_mapgen_heightmap_mouseup,
-    NULL,
+    nullptr,
     window_mapgen_heightmap_mousedown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_mapgen_heightmap_invalidate,
     window_mapgen_heightmap_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *PageEvents[] = {
@@ -568,7 +568,7 @@ static sint32 _heightmapHigh = 70;
 rct_window *window_mapgen_open()
 {
     rct_window *w = window_bring_to_front_by_class(WC_MAPGEN);
-    if (w != NULL) {
+    if (w != nullptr) {
         return w;
     }
 
@@ -745,7 +745,7 @@ static void window_mapgen_textinput(rct_window *w, rct_widgetindex widgetIndex,
     sint32 value;
     char* end;
 
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     value = strtol(text, &end, 10);
@@ -795,10 +795,10 @@ static void window_mapgen_base_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     const uint8 textColour = w->colours[1];
 
-    gfx_draw_string_left(dpi, STR_MAP_SIZE, NULL, textColour, w->x + 4, w->y + w->widgets[WIDX_MAP_SIZE].top + 1);
-    gfx_draw_string_left(dpi, STR_BASE_HEIGHT_LABEL, NULL, textColour, w->x + 4, w->y + w->widgets[WIDX_BASE_HEIGHT].top + 1);
-    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, NULL, textColour, w->x + 4, w->y + w->widgets[WIDX_WATER_LEVEL].top + 1);
-    gfx_draw_string_left(dpi, STR_TERRAIN_LABEL, NULL, textColour, w->x + 4, w->y + w->widgets[WIDX_FLOOR_TEXTURE].top + 1);
+    gfx_draw_string_left(dpi, STR_MAP_SIZE, nullptr, textColour, w->x + 4, w->y + w->widgets[WIDX_MAP_SIZE].top + 1);
+    gfx_draw_string_left(dpi, STR_BASE_HEIGHT_LABEL, nullptr, textColour, w->x + 4, w->y + w->widgets[WIDX_BASE_HEIGHT].top + 1);
+    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, nullptr, textColour, w->x + 4, w->y + w->widgets[WIDX_WATER_LEVEL].top + 1);
+    gfx_draw_string_left(dpi, STR_TERRAIN_LABEL, nullptr, textColour, w->x + 4, w->y + w->widgets[WIDX_FLOOR_TEXTURE].top + 1);
 
     // The practical map size is 2 lower than the technical map size
     rct_xy16 mapSizeArgs = MakeXY16(_mapSize - 2, _mapSize -2);
@@ -1051,12 +1051,12 @@ static void window_mapgen_simplex_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     const uint8 textColour = w->colours[1];
 
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_LOW_, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_LOW].top + 1);
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_HIGH, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_HIGH].top + 1);
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_BASE_FREQUENCY, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_BASE_FREQ].top + 1);
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_OCTAVES, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_OCTAVES].top + 1);
-    gfx_draw_string_left(dpi, STR_MAP_SIZE, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_MAP_SIZE].top + 1);
-    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, NULL, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_WATER_LEVEL].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_LOW_, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_LOW].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_HIGH, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_HIGH].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_BASE_FREQUENCY, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_BASE_FREQ].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_OCTAVES, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_OCTAVES].top + 1);
+    gfx_draw_string_left(dpi, STR_MAP_SIZE, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_MAP_SIZE].top + 1);
+    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, nullptr, textColour, w->x + 5, w->y + w->widgets[WIDX_SIMPLEX_WATER_LEVEL].top + 1);
 
     gfx_draw_string_left(dpi, STR_COMMA16, &_simplex_low, textColour, w->x + w->widgets[WIDX_SIMPLEX_LOW].left + 1, w->y + w->widgets[WIDX_SIMPLEX_LOW].top + 1);
     gfx_draw_string_left(dpi, STR_COMMA16, &_simplex_high, textColour, w->x + w->widgets[WIDX_SIMPLEX_HIGH].left + 1, w->y + w->widgets[WIDX_SIMPLEX_HIGH].top + 1);
@@ -1162,7 +1162,7 @@ static void window_mapgen_heightmap_mouseup(rct_window *w, rct_widgetindex widge
 
         // Page widgets
     case WIDX_HEIGHTMAP_SELECT:
-        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_IMAGE, NULL);
+        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_IMAGE, nullptr);
         window_loadsave_set_loadsave_callback(window_mapgen_heightmap_loadsave_callback);
         return;
     case WIDX_HEIGHTMAP_SMOOTH_HEIGHTMAP:
@@ -1216,23 +1216,23 @@ static void window_mapgen_heightmap_paint(rct_window *w, rct_drawpixelinfo *dpi)
     // Smooth strength label and value
     const uint8 strengthColour = _heightmapSmoothMap ? enabledColour : disabledColour;
     sint16 strength = _heightmapSmoothStrength;
-    gfx_draw_string_left(dpi, STR_MAPGEN_SMOOTH_STRENGTH, NULL, strengthColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_STRENGTH].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SMOOTH_STRENGTH, nullptr, strengthColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_STRENGTH].top + 1);
     gfx_draw_string_left(dpi, STR_COMMA16, &strength, strengthColour, w->x + w->widgets[WIDX_HEIGHTMAP_STRENGTH].left + 1, w->y + w->widgets[WIDX_HEIGHTMAP_STRENGTH].top + 1);
 
     // Low label and value
     const uint8 labelColour = _heightmapLoaded ? enabledColour : disabledColour;
     sint16 low = _heightmapLow;
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_LOW_, NULL, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_LOW].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_LOW_, nullptr, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_LOW].top + 1);
     gfx_draw_string_left(dpi, STR_COMMA16, &low, labelColour, w->x + w->widgets[WIDX_HEIGHTMAP_LOW].left + 1, w->y + w->widgets[WIDX_HEIGHTMAP_LOW].top + 1);
 
     // High label and value
     sint16 high = _heightmapHigh;
-    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_HIGH, NULL, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_HIGH].top + 1);
+    gfx_draw_string_left(dpi, STR_MAPGEN_SIMPLEX_NOISE_HIGH, nullptr, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_HIGH].top + 1);
     gfx_draw_string_left(dpi, STR_COMMA16, &high, labelColour, w->x + w->widgets[WIDX_HEIGHTMAP_HIGH].left + 1, w->y + w->widgets[WIDX_HEIGHTMAP_HIGH].top + 1);
 
     // Water level label and value
     sint16 waterLevel = _waterLevel;
-    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, NULL, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_WATER_LEVEL].top + 1);
+    gfx_draw_string_left(dpi, STR_WATER_LEVEL_LABEL, nullptr, labelColour, w->x + 5, w->y + w->widgets[WIDX_HEIGHTMAP_WATER_LEVEL].top + 1);
     gfx_draw_string_left(dpi, STR_COMMA16, &waterLevel, labelColour, w->x + w->widgets[WIDX_HEIGHTMAP_WATER_LEVEL].left + 1, w->y + w->widgets[WIDX_HEIGHTMAP_WATER_LEVEL].top + 1);
 }
 
@@ -1244,9 +1244,9 @@ static void window_mapgen_set_page(rct_window *w, sint32 page)
 {
     w->page = page;
     w->frame_no = 0;
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
     }
 
     w->enabled_widgets = PageEnabledWidgets[page];
diff --git a/src/openrct2-ui/windows/Multiplayer.cpp b/src/openrct2-ui/windows/Multiplayer.cpp
index c55c72ddda..39ce902cdb 100644
--- a/src/openrct2-ui/windows/Multiplayer.cpp
+++ b/src/openrct2-ui/windows/Multiplayer.cpp
@@ -154,127 +154,127 @@ static void window_multiplayer_options_invalidate(rct_window *w);
 static void window_multiplayer_options_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_multiplayer_information_events = {
-    NULL,
+    nullptr,
     window_multiplayer_information_mouseup,
     window_multiplayer_information_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_information_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_information_invalidate,
     window_multiplayer_information_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_multiplayer_players_events = {
-    NULL,
+    nullptr,
     window_multiplayer_players_mouseup,
     window_multiplayer_players_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_players_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_players_scrollgetsize,
     window_multiplayer_players_scrollmousedown,
-    NULL,
+    nullptr,
     window_multiplayer_players_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_players_invalidate,
     window_multiplayer_players_paint,
     window_multiplayer_players_scrollpaint
 };
 
 static rct_window_event_list window_multiplayer_groups_events = {
-    NULL,
+    nullptr,
     window_multiplayer_groups_mouseup,
     window_multiplayer_groups_resize,
     window_multiplayer_groups_mousedown,
     window_multiplayer_groups_dropdown,
-    NULL,
+    nullptr,
     window_multiplayer_groups_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_groups_scrollgetsize,
     window_multiplayer_groups_scrollmousedown,
-    NULL,
+    nullptr,
     window_multiplayer_groups_scrollmouseover,
     window_multiplayer_groups_text_input,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_groups_invalidate,
     window_multiplayer_groups_paint,
     window_multiplayer_groups_scrollpaint
 };
 
 static rct_window_event_list window_multiplayer_options_events = {
-    NULL,
+    nullptr,
     window_multiplayer_options_mouseup,
     window_multiplayer_options_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_options_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_multiplayer_options_invalidate,
     window_multiplayer_options_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_multiplayer_page_events[] = {
@@ -297,7 +297,7 @@ rct_window * window_multiplayer_open()
 {
     // Check if window is already open
     rct_window *window = window_bring_to_front_by_class(WC_MULTIPLAYER);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_auto_pos(320, 144, &window_multiplayer_players_events, WC_MULTIPLAYER, WF_10 | WF_RESIZABLE);
         window_multiplayer_set_page(window, WINDOW_MULTIPLAYER_PAGE_INFORMATION);
     }
@@ -585,10 +585,10 @@ static void window_multiplayer_players_paint(rct_window *w, rct_drawpixelinfo *d
     window_multiplayer_draw_tab_images(w, dpi);
 
     // Columns
-    gfx_draw_string_left(dpi, STR_PLAYER, NULL, w->colours[2], w->x + 6, 58 - 12 + w->y + 1);
-    gfx_draw_string_left(dpi, STR_GROUP, NULL, w->colours[2], w->x + 180, 58 - 12 + w->y + 1);
-    gfx_draw_string_left(dpi, STR_LAST_ACTION, NULL, w->colours[2], w->x + 263, 58 - 12 + w->y + 1);
-    gfx_draw_string_left(dpi, STR_PING, NULL, w->colours[2], w->x + 363, 58 - 12 + w->y + 1);
+    gfx_draw_string_left(dpi, STR_PLAYER, nullptr, w->colours[2], w->x + 6, 58 - 12 + w->y + 1);
+    gfx_draw_string_left(dpi, STR_GROUP, nullptr, w->colours[2], w->x + 180, 58 - 12 + w->y + 1);
+    gfx_draw_string_left(dpi, STR_LAST_ACTION, nullptr, w->colours[2], w->x + 263, 58 - 12 + w->y + 1);
+    gfx_draw_string_left(dpi, STR_PING, nullptr, w->colours[2], w->x + 363, 58 - 12 + w->y + 1);
 
     // Number of players
     stringId = w->no_list_items == 1 ? STR_MULTIPLAYER_PLAYER_COUNT : STR_MULTIPLAYER_PLAYER_COUNT_PLURAL;
@@ -793,7 +793,7 @@ static void window_multiplayer_groups_text_input(rct_window *w, rct_widgetindex
     if (widgetIndex != WIDX_RENAME_GROUP)
         return;
 
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     game_do_command(3 | (_selectedGroup << 8) | (1 << 16), GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 0)), GAME_COMMAND_MODIFY_GROUPS, *((sint32*)(text + 8)), *((sint32*)(text + 4)));
@@ -843,7 +843,7 @@ static void window_multiplayer_groups_paint(rct_window *w, rct_drawpixelinfo *dp
     sint32 x = w->x + window_multiplayer_groups_widgets[WIDX_CONTENT_PANEL].left + 4;
     sint32 y = w->y + window_multiplayer_groups_widgets[WIDX_CONTENT_PANEL].top + 4;
 
-    gfx_draw_string_left(dpi, STR_DEFAULT_GROUP, NULL, w->colours[2], x, y);
+    gfx_draw_string_left(dpi, STR_DEFAULT_GROUP, nullptr, w->colours[2], x, y);
 
     y += 20;
 
diff --git a/src/openrct2-ui/windows/MusicCredits.cpp b/src/openrct2-ui/windows/MusicCredits.cpp
index 63a7e86b10..84391c1cfe 100644
--- a/src/openrct2-ui/windows/MusicCredits.cpp
+++ b/src/openrct2-ui/windows/MusicCredits.cpp
@@ -92,32 +92,32 @@ static void window_music_credits_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_music_credits_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list window_music_credits_events = {
-    NULL,
+    nullptr,
     window_music_credits_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_music_credits_scrollgetsize,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_music_credits_paint,
     window_music_credits_scrollpaint
 };
@@ -132,7 +132,7 @@ rct_window * window_music_credits_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_MUSIC_CREDITS);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_centred(
@@ -196,13 +196,13 @@ static void window_music_credits_scrollpaint(rct_window *w, rct_drawpixelinfo *d
     sint32 y = 2;
 
     for (size_t i = 0; i < Util::CountOf(music_credits); i++) {
-        gfx_draw_string_centred(dpi, music_credits[i], x, y, COLOUR_BLACK, NULL);
+        gfx_draw_string_centred(dpi, music_credits[i], x, y, COLOUR_BLACK, nullptr);
         y += 10;
     }
 
     // Add 4 more space before "Original recordings ...".
     y += 4;
-    gfx_draw_string_centred(dpi, STR_MUSIC_ACKNOWLEDGEMENTS_ORIGINAL_RECORDINGS, x, y, COLOUR_BLACK, NULL);
+    gfx_draw_string_centred(dpi, STR_MUSIC_ACKNOWLEDGEMENTS_ORIGINAL_RECORDINGS, x, y, COLOUR_BLACK, nullptr);
     y += 10;
 
     // Draw the separator
@@ -211,7 +211,7 @@ static void window_music_credits_scrollpaint(rct_window *w, rct_drawpixelinfo *d
     y += 11;
 
     for (size_t i = 0; i < Util::CountOf(music_credits_rct2); i++) {
-        gfx_draw_string_centred(dpi, music_credits_rct2[i], x, y, COLOUR_BLACK, NULL);
+        gfx_draw_string_centred(dpi, music_credits_rct2[i], x, y, COLOUR_BLACK, nullptr);
         y += 10;
     }
 
diff --git a/src/openrct2-ui/windows/News.cpp b/src/openrct2-ui/windows/News.cpp
index c1af5fbf62..f5af0e7623 100644
--- a/src/openrct2-ui/windows/News.cpp
+++ b/src/openrct2-ui/windows/News.cpp
@@ -55,32 +55,32 @@ static void window_news_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_news_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list window_news_events = {
-    NULL,
+    nullptr,
     window_news_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_scrollgetsize,
     window_news_scrollmousedown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_tooltip,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_paint,
     window_news_scrollpaint
 };
@@ -95,7 +95,7 @@ rct_window * window_news_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_RECENT_NEWS);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_auto_pos(
             400,
             300,
@@ -171,7 +171,7 @@ static void window_news_update(rct_window *w)
             else if (w->news.var_482 > 1) {
                 news_item_get_subject_location(newsItem->Type, newsItem->Assoc, &x, &y, &z);
                 if (x != SPRITE_LOCATION_NULL)
-                    if ((w = window_get_main()) != NULL)
+                    if ((w = window_get_main()) != nullptr)
                         window_scroll_to_location(w, x, y, z);
                 return;
             }
diff --git a/src/openrct2-ui/windows/NewsOptions.cpp b/src/openrct2-ui/windows/NewsOptions.cpp
index 874d41898d..38e59c06ad 100644
--- a/src/openrct2-ui/windows/NewsOptions.cpp
+++ b/src/openrct2-ui/windows/NewsOptions.cpp
@@ -96,34 +96,34 @@ static void window_news_options_invalidate(rct_window *w);
 static void window_news_options_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_news_options_events = {
-    NULL,
+    nullptr,
     window_news_options_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_options_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_news_options_invalidate,
     window_news_options_paint,
-    NULL
+    nullptr
 };
 
 static void window_news_options_set_page(rct_window *w, sint32 page);
@@ -136,7 +136,7 @@ rct_window * window_news_options_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_NOTIFICATION_OPTIONS);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_centred(
             400,
             300,
diff --git a/src/openrct2-ui/windows/Options.cpp b/src/openrct2-ui/windows/Options.cpp
index 6a935decca..3710906103 100644
--- a/src/openrct2-ui/windows/Options.cpp
+++ b/src/openrct2-ui/windows/Options.cpp
@@ -423,32 +423,32 @@ static void window_options_tooltip(rct_window *w, rct_widgetindex widgetIndex, r
 static rct_window_event_list window_options_events = {
     window_options_close,
     window_options_mouseup,
-    NULL,
+    nullptr,
     window_options_mousedown,
     window_options_dropdown,
-    NULL,
+    nullptr,
     window_options_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_options_scrollgetsize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_options_text_input,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_options_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_options_invalidate,
     window_options_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -574,7 +574,7 @@ static uint64 window_options_page_enabled_widgets[] = {
 
 #pragma endregion
 
-static struct Resolution * _resolutions = NULL;
+static struct Resolution * _resolutions = nullptr;
 static sint32 _numResolutions = 0;
 
 /**
@@ -587,7 +587,7 @@ rct_window * window_options_open()
 
     // Check if window is already open
     w = window_bring_to_front_by_class(WC_OPTIONS);
-    if (w != NULL)
+    if (w != nullptr)
         return w;
 
     w = window_create_centred(WW, WH, &window_options_events, WC_OPTIONS, 0);
@@ -603,7 +603,7 @@ rct_window * window_options_open()
 static void window_options_close(rct_window *w)
 {
     free(_resolutions);
-    _resolutions = NULL;
+    _resolutions = nullptr;
     _numResolutions = 0;
 }
 
@@ -673,7 +673,7 @@ static void window_options_mouseup(rct_window *w, rct_widgetindex widgetIndex)
             gConfigGeneral.always_show_gridlines ^= 1;
             config_save_default();
             gfx_invalidate_screen();
-            if ((w = window_get_main()) != NULL) {
+            if ((w = window_get_main()) != nullptr) {
                 if (gConfigGeneral.always_show_gridlines)
                     w->viewport->flags |= VIEWPORT_FLAG_GRIDLINES;
                 else
@@ -1418,8 +1418,8 @@ static void window_options_dropdown(rct_window *w, rct_widgetindex widgetIndex,
             audio_init_ride_sounds(dropdownIndex);
             if (dropdownIndex < gAudioDeviceCount) {
                 if (dropdownIndex == 0) {
-                    Mixer_Init(NULL);
-                    gConfigSound.device = NULL;
+                    Mixer_Init(nullptr);
+                    gConfigSound.device = nullptr;
                 }
                 else {
                     char* devicename = gAudioDevices[dropdownIndex].name;
@@ -1837,7 +1837,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left_clipped(
             dpi,
             DrawingEngineStringIds[gConfigGeneral.drawing_engine],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_culture_widgets[WIDX_DRAWING_ENGINE].left + 1,
             w->y + window_options_culture_widgets[WIDX_DRAWING_ENGINE].top,
@@ -1877,7 +1877,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left(
             dpi,
             DateFormatStringIds[gConfigGeneral.date_format],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_culture_widgets[WIDX_DATE_FORMAT].left + 1,
             w->y + window_options_culture_widgets[WIDX_DATE_FORMAT].top
@@ -1887,7 +1887,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
     {
         // Sound device
         rct_string_id audioDeviceStringId = STR_OPTIONS_SOUND_VALUE_DEFAULT;
-        const char * audioDeviceName = NULL;
+        const char * audioDeviceName = nullptr;
         if (gAudioCurrentDevice == -1) {
             audioDeviceStringId = STR_SOUND_NONE;
         } else {
@@ -1915,7 +1915,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left(
             dpi,
             window_options_title_music_names[gConfigSound.title_music],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_audio_widgets[WIDX_TITLE_MUSIC].left + 1,
             w->y + window_options_audio_widgets[WIDX_TITLE_MUSIC].top
@@ -1930,7 +1930,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         const utf8 * activeThemeName = theme_manager_get_available_theme_name(activeAvailableThemeIndex);
         set_format_arg(0, uintptr_t, (uintptr_t)activeThemeName);
 
-        gfx_draw_string_left(dpi, STR_THEMES_LABEL_CURRENT_THEME, NULL, w->colours[1], w->x + 10, w->y + window_options_controls_and_interface_widgets[WIDX_THEMES].top + 1);
+        gfx_draw_string_left(dpi, STR_THEMES_LABEL_CURRENT_THEME, nullptr, w->colours[1], w->x + 10, w->y + window_options_controls_and_interface_widgets[WIDX_THEMES].top + 1);
         gfx_draw_string_left_clipped(
             dpi,
             STR_STRING,
@@ -1940,13 +1940,13 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
             w->y + window_options_controls_and_interface_widgets[WIDX_THEMES].top,
             window_options_controls_and_interface_widgets[WIDX_THEMES_DROPDOWN].left - window_options_controls_and_interface_widgets[WIDX_THEMES].left - 4
         );
-        gfx_draw_string_left(dpi, STR_OPTIONS_SCENARIO_GROUPING, NULL, w->colours[1], w->x + 10, w->y + window_options_controls_and_interface_widgets[WIDX_SCENARIO_GROUPING].top + 1);
+        gfx_draw_string_left(dpi, STR_OPTIONS_SCENARIO_GROUPING, nullptr, w->colours[1], w->x + 10, w->y + window_options_controls_and_interface_widgets[WIDX_SCENARIO_GROUPING].top + 1);
         gfx_draw_string_left_clipped(
             dpi,
             gConfigGeneral.scenario_select_mode == SCENARIO_SELECT_MODE_DIFFICULTY ?
                 STR_OPTIONS_SCENARIO_DIFFICULTY :
                 STR_OPTIONS_SCENARIO_ORIGIN,
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_controls_and_interface_widgets[WIDX_SCENARIO_GROUPING].left + 1,
             w->y + window_options_controls_and_interface_widgets[WIDX_SCENARIO_GROUPING].top,
@@ -1960,7 +1960,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left(
             dpi,
             window_options_autosave_names[gConfigGeneral.autosave_frequency],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_misc_widgets[WIDX_AUTOSAVE].left + 1,
             w->y + window_options_misc_widgets[WIDX_AUTOSAVE].top
@@ -1983,7 +1983,7 @@ static void window_options_paint(rct_window *w, rct_drawpixelinfo *dpi)
         gfx_draw_string_left(
             dpi,
             RideInspectionIntervalNames[gConfigGeneral.default_inspection_interval],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + window_options_misc_widgets[WIDX_DEFAULT_INSPECTION_INTERVAL].left + 1,
             w->y + window_options_misc_widgets[WIDX_DEFAULT_INSPECTION_INTERVAL].top
@@ -2047,7 +2047,7 @@ static void window_options_scrollgetsize(rct_window *w, sint32 scrollIndex, sint
 
 static void window_options_text_input(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     if (widgetIndex == WIDX_CHANNEL_BUTTON) {
diff --git a/src/openrct2-ui/windows/SavePrompt.cpp b/src/openrct2-ui/windows/SavePrompt.cpp
index 7618f84853..6d9f1f0486 100644
--- a/src/openrct2-ui/windows/SavePrompt.cpp
+++ b/src/openrct2-ui/windows/SavePrompt.cpp
@@ -80,32 +80,32 @@ static void window_save_prompt_callback(sint32 result, const utf8 * path);
 static rct_window_event_list window_save_prompt_events = {
     window_save_prompt_close,
     window_save_prompt_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_save_prompt_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2-ui/windows/ServerList.cpp b/src/openrct2-ui/windows/ServerList.cpp
index dc4f5e4573..66438efeaf 100644
--- a/src/openrct2-ui/windows/ServerList.cpp
+++ b/src/openrct2-ui/windows/ServerList.cpp
@@ -40,7 +40,7 @@ extern "C"
 #define ITEM_HEIGHT (3 + 9 + 3)
 
 static char _playerName[32 + 1];
-static server_entry *_serverEntries = NULL;
+static server_entry *_serverEntries = nullptr;
 static sint32 _numServerEntries = 0;
 static std::mutex _mutex;
 static uint32 _numPlayersOnline = 0;
@@ -90,28 +90,28 @@ static rct_window_event_list window_server_list_events = {
     window_server_list_close,
     window_server_list_mouseup,
     window_server_list_resize,
-    NULL,
+    nullptr,
     window_server_list_dropdown,
-    NULL,
+    nullptr,
     window_server_list_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_server_list_scroll_getsize,
     window_server_list_scroll_mousedown,
-    NULL,
+    nullptr,
     window_server_list_scroll_mouseover,
     window_server_list_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_server_list_invalidate,
     window_server_list_paint,
     window_server_list_scrollpaint
@@ -123,7 +123,7 @@ enum {
 };
 
 static sint32 _hoverButtonIndex = -1;
-static char * _version = NULL;
+static char * _version = nullptr;
 
 static void server_list_get_item_button(sint32 buttonIndex, sint32 x, sint32 y, sint32 width, sint32 *outX, sint32 *outY);
 static void server_list_load_server_entries();
@@ -145,7 +145,7 @@ rct_window * window_server_list_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_SERVER_LIST);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_centred(WWIDTH_MIN, WHEIGHT_MIN, &window_server_list_events, WC_SERVER_LIST, WF_10 | WF_RESIZABLE);
@@ -328,7 +328,7 @@ static void window_server_list_scroll_mouseover(rct_window *w, sint32 scrollInde
 
 static void window_server_list_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL || text[0] == 0) return;
+    if (text == nullptr || text[0] == 0) return;
 
     switch (widgetIndex) {
     case WIDX_PLAYER_NAME_INPUT:
@@ -396,7 +396,7 @@ static void window_server_list_paint(rct_window *w, rct_drawpixelinfo *dpi)
 {
     window_draw_widgets(w, dpi);
 
-    gfx_draw_string_left(dpi, STR_PLAYER_NAME, NULL, COLOUR_WHITE, w->x + 6, w->y + w->widgets[WIDX_PLAYER_NAME_INPUT].top);
+    gfx_draw_string_left(dpi, STR_PLAYER_NAME, nullptr, COLOUR_WHITE, w->x + 6, w->y + w->widgets[WIDX_PLAYER_NAME_INPUT].top);
     const char * version = NETWORK_STREAM_ID;
     gfx_draw_string_left(dpi, STR_NETWORK_VERSION, (void*)&version, COLOUR_WHITE, w->x + 324, w->y + w->widgets[WIDX_START_SERVER].top);
 
@@ -525,7 +525,7 @@ static void server_list_save_server_entries()
 
 static void dispose_server_entry_list()
 {
-    if (_serverEntries != NULL) {
+    if (_serverEntries != nullptr) {
         for (sint32 i = 0; i < _numServerEntries; i++) {
             dispose_server_entry(&_serverEntries[i]);
         }
@@ -551,7 +551,7 @@ static server_entry* add_server_entry(char *address)
     }
 
     _numServerEntries++;
-    if (_serverEntries == NULL) {
+    if (_serverEntries == nullptr) {
         _serverEntries = (server_entry *)malloc(_numServerEntries * sizeof(server_entry));
     } else {
         _serverEntries = (server_entry *)realloc(_serverEntries, _numServerEntries * sizeof(server_entry));
@@ -612,7 +612,7 @@ static sint32 server_compare(const void *a, const void *b)
 
 static void sort_servers()
 {
-    if (_serverEntries == NULL) {
+    if (_serverEntries == nullptr) {
         return;
     }
     qsort(_serverEntries, _numServerEntries, sizeof(server_entry), server_compare);
@@ -637,7 +637,7 @@ static void join_server(char *address)
     char *dot = strchr(address, '.');
 
     char *colon = strrchr(address, ':');
-    if (colon != NULL && (endbracket != NULL || dot != NULL)) {
+    if (colon != nullptr && (endbracket != nullptr || dot != nullptr)) {
         address = substr(address, (sint32)(colon - address));
         sscanf(colon + 1, "%d", &port);
         addresscopied = true;
@@ -689,7 +689,7 @@ static void fetch_servers()
     http_request_t request = {};
     request.url = masterServerUrl;
     request.method = HTTP_METHOD_GET;
-    request.body = NULL;
+    request.body = nullptr;
     request.type = HTTP_DATA_JSON;
     http_request_async(&request, fetch_servers_callback);
 #endif
@@ -698,7 +698,7 @@ static void fetch_servers()
 #ifndef DISABLE_HTTP
 static void fetch_servers_callback(http_response_t* response)
 {
-    if (response == NULL) {
+    if (response == nullptr) {
         log_warning("Unable to connect to master server");
         return;
     }
@@ -742,7 +742,7 @@ static void fetch_servers_callback(http_response_t* response)
         json_t *ip4 = json_object_get(ip, "v4");
         json_t *addressIp = json_array_get(ip4, 0);
 
-        if (name == NULL || version == NULL)
+        if (name == nullptr || version == nullptr)
         {
             log_verbose("Cowardly refusing to add server without name or version specified.");
             continue;
@@ -759,7 +759,7 @@ static void fetch_servers_callback(http_response_t* response)
             SafeFree(newserver->version);
             newserver->name = _strdup(json_string_value(name));
             newserver->requiresPassword = json_is_true(requiresPassword);
-            newserver->description = _strdup(description == NULL ? "" : json_string_value(description));
+            newserver->description = _strdup(description == nullptr ? "" : json_string_value(description));
             newserver->version = _strdup(json_string_value(version));
             newserver->players = (uint8)json_integer_value(players);
             newserver->maxplayers = (uint8)json_integer_value(maxPlayers);
@@ -771,7 +771,7 @@ static void fetch_servers_callback(http_response_t* response)
     _numPlayersOnline = get_total_player_count();
 
     rct_window *window = window_find_by_class(WC_SERVER_LIST);
-    if (window != NULL) {
+    if (window != nullptr) {
         window_invalidate(window);
     }
 }
diff --git a/src/openrct2-ui/windows/ServerStart.cpp b/src/openrct2-ui/windows/ServerStart.cpp
index 4721d5300e..d2b6ea5fc6 100644
--- a/src/openrct2-ui/windows/ServerStart.cpp
+++ b/src/openrct2-ui/windows/ServerStart.cpp
@@ -82,32 +82,32 @@ static void window_server_start_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static rct_window_event_list window_server_start_events = {
     window_server_start_close,
     window_server_start_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_server_start_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_server_start_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_server_start_invalidate,
     window_server_start_paint,
-    NULL
+    nullptr
 };
 
 rct_window * window_server_start_open()
@@ -116,7 +116,7 @@ rct_window * window_server_start_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_SERVER_START);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_centred(WW, WH, &window_server_start_events, WC_SERVER_START, WF_10);
@@ -230,7 +230,7 @@ static void window_server_start_mouseup(rct_window *w, rct_widgetindex widgetInd
         break;
     case WIDX_LOAD_SERVER:
         network_set_password(_password);
-        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_GAME, NULL);
+        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_GAME, nullptr);
         window_loadsave_set_loadsave_callback(window_server_start_loadsave_callback);
         break;
     }
@@ -249,7 +249,7 @@ static void window_server_start_update(rct_window *w)
 
 static void window_server_start_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL) return;
+    if (text == nullptr) return;
 
     switch (widgetIndex) {
     case WIDX_PORT_INPUT:
@@ -343,10 +343,10 @@ static void window_server_start_paint(rct_window *w, rct_drawpixelinfo *dpi)
 {
     window_draw_widgets(w, dpi);
 
-    gfx_draw_string_left(dpi, STR_PORT, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_PORT_INPUT].top);
-    gfx_draw_string_left(dpi, STR_SERVER_NAME, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_NAME_INPUT].top);
-    gfx_draw_string_left(dpi, STR_SERVER_DESCRIPTION, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_DESCRIPTION_INPUT].top);
-    gfx_draw_string_left(dpi, STR_SERVER_GREETING, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_GREETING_INPUT].top);
-    gfx_draw_string_left(dpi, STR_PASSWORD, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_PASSWORD_INPUT].top);
-    gfx_draw_string_left(dpi, STR_MAX_PLAYERS, NULL, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_MAXPLAYERS].top);
+    gfx_draw_string_left(dpi, STR_PORT, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_PORT_INPUT].top);
+    gfx_draw_string_left(dpi, STR_SERVER_NAME, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_NAME_INPUT].top);
+    gfx_draw_string_left(dpi, STR_SERVER_DESCRIPTION, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_DESCRIPTION_INPUT].top);
+    gfx_draw_string_left(dpi, STR_SERVER_GREETING, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_GREETING_INPUT].top);
+    gfx_draw_string_left(dpi, STR_PASSWORD, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_PASSWORD_INPUT].top);
+    gfx_draw_string_left(dpi, STR_MAX_PLAYERS, nullptr, w->colours[1], w->x + 6, w->y + w->widgets[WIDX_MAXPLAYERS].top);
 }
diff --git a/src/openrct2-ui/windows/ShortcutKeyChange.cpp b/src/openrct2-ui/windows/ShortcutKeyChange.cpp
index c21aaf4ba7..9730c1fbd6 100644
--- a/src/openrct2-ui/windows/ShortcutKeyChange.cpp
+++ b/src/openrct2-ui/windows/ShortcutKeyChange.cpp
@@ -47,34 +47,34 @@ static void window_shortcut_change_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 // 0x9A3F7C
 static rct_window_event_list window_shortcut_change_events = {
-    NULL,
+    nullptr,
     window_shortcut_change_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_shortcut_change_paint,
-    NULL
+    nullptr
 };
 
 rct_window * window_shortcut_change_open(sint32 selected_key)
diff --git a/src/openrct2-ui/windows/ShortcutKeys.cpp b/src/openrct2-ui/windows/ShortcutKeys.cpp
index 92b23c2e56..151b2d3d78 100644
--- a/src/openrct2-ui/windows/ShortcutKeys.cpp
+++ b/src/openrct2-ui/windows/ShortcutKeys.cpp
@@ -59,31 +59,31 @@ static void window_shortcut_scrollmouseover(rct_window *w, sint32 scrollIndex, s
 static void window_shortcut_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list window_shortcut_events = {
-    NULL,
+    nullptr,
     window_shortcut_mouseup,
     window_shortcut_resize,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_shortcut_scrollgetsize,
     window_shortcut_scrollmousedown,
-    NULL,
+    nullptr,
     window_shortcut_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_shortcut_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_shortcut_invalidate,
     window_shortcut_paint,
     window_shortcut_scrollpaint
@@ -166,7 +166,7 @@ const rct_string_id ShortcutStringIds[SHORTCUT_COUNT] = {
 rct_window * window_shortcut_keys_open()
 {
     rct_window * w = window_bring_to_front_by_class(WC_KEYBOARD_SHORTCUT_LIST);
-    if (w == NULL)
+    if (w == nullptr)
     {
         w = window_create_auto_pos(WW, WH, &window_shortcut_events, WC_KEYBOARD_SHORTCUT_LIST, WF_RESIZABLE);
 
diff --git a/src/openrct2-ui/windows/StaffList.cpp b/src/openrct2-ui/windows/StaffList.cpp
index 6b5a003be7..6409d5a297 100644
--- a/src/openrct2-ui/windows/StaffList.cpp
+++ b/src/openrct2-ui/windows/StaffList.cpp
@@ -64,26 +64,26 @@ static rct_window_event_list window_staff_list_events = {
     window_staff_list_resize,
     window_staff_list_mousedown,
     window_staff_list_dropdown,
-    NULL,
+    nullptr,
     window_staff_list_update,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_list_tooldown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_staff_list_toolabort,
-    NULL,
+    nullptr,
     window_staff_list_scrollgetsize,
     window_staff_list_scrollmousedown,
-    NULL,
+    nullptr,
     window_staff_list_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_list_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_staff_list_invalidate,
     window_staff_list_paint,
     window_staff_list_scrollpaint,
@@ -158,7 +158,7 @@ rct_window * window_staff_list_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_STAFF_LIST);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_auto_pos(WW, WH, &window_staff_list_events, WC_STAFF_LIST, WF_10 | WF_RESIZABLE);
@@ -313,7 +313,7 @@ void window_staff_list_update(rct_window *w)
         widget_invalidate(w, WIDX_STAFF_LIST_HANDYMEN_TAB + _windowStaffListSelectedTab);
 
         // Enable highlighting of these staff members in map window
-        if (window_find_by_class(WC_MAP) != NULL) {
+        if (window_find_by_class(WC_MAP) != nullptr) {
             sint32 spriteIndex;
             rct_peep * peep;
             gWindowMapFlashingFlags |= (1 << 2);
@@ -346,7 +346,7 @@ static void window_staff_list_tooldown(rct_window *w, rct_widgetindex widgetInde
         bool isPatrolAreaSet = staff_is_patrol_area_set(200 + selectedPeepType, x, y);
 
         uint16 spriteIndex;
-        rct_peep *peep, *closestPeep = NULL;
+        rct_peep *peep, *closestPeep = nullptr;
         sint32 closestPeepDistance = INT_MAX;
         FOR_ALL_STAFF(spriteIndex, peep) {
             if (peep->staff_type != selectedPeepType)
@@ -372,7 +372,7 @@ static void window_staff_list_tooldown(rct_window *w, rct_widgetindex widgetInde
             }
         }
 
-        if (closestPeep != NULL) {
+        if (closestPeep != nullptr) {
             tool_cancel();
             rct_window *staffWindow = window_staff_open(closestPeep);
             window_event_dropdown_call(staffWindow, WC_PEEP__WIDX_PATROL, 0);
diff --git a/src/openrct2-ui/windows/Themes.cpp b/src/openrct2-ui/windows/Themes.cpp
index baf9055389..c87950f652 100644
--- a/src/openrct2-ui/windows/Themes.cpp
+++ b/src/openrct2-ui/windows/Themes.cpp
@@ -59,31 +59,31 @@ static void window_themes_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sin
 static void window_themes_draw_tab_images(rct_drawpixelinfo *dpi, rct_window *w);
 
 static rct_window_event_list window_themes_events = {
-    NULL,
+    nullptr,
     window_themes_mouseup,
     window_themes_resize,
     window_themes_mousedown,
     window_themes_dropdown,
-    NULL,
+    nullptr,
     window_themes_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_themes_scrollgetsize,
     window_themes_scrollmousedown,
-    NULL,
+    nullptr,
     window_themes_scrollmouseover,
     window_themes_textinput,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_themes_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_themes_invalidate,
     window_themes_paint,
     window_themes_scrollpaint,
@@ -257,7 +257,7 @@ static rct_windowclass window_themes_tab_7_classes[] = {
 };
 
 static rct_windowclass *window_themes_tab_classes[] = {
-    NULL,
+    nullptr,
     window_themes_tab_1_classes,
     window_themes_tab_2_classes,
     window_themes_tab_3_classes,
@@ -316,7 +316,7 @@ rct_window * window_themes_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_THEMES);
-    if (window != NULL)
+    if (window != nullptr)
         return window;
 
     window = window_create_auto_pos(320, 107, &window_themes_events, WC_THEMES, WF_10 | WF_RESIZABLE);
@@ -646,7 +646,7 @@ void window_themes_scrollmouseover(rct_window *w, sint32 scrollIndex, sint32 x,
 
 static void window_themes_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (text == NULL || text[0] == 0)
+    if (text == nullptr || text[0] == 0)
         return;
 
     switch (widgetIndex) {
@@ -702,7 +702,7 @@ void window_themes_invalidate(rct_window *w)
 
     w->pressed_widgets = pressed_widgets | (1 << widgetIndex);
 
-    if (window_find_by_class(WC_DROPDOWN) == NULL) {
+    if (window_find_by_class(WC_DROPDOWN) == nullptr) {
         _colour_index_1 = -1;
         _colour_index_2 = -1;
     }
@@ -778,7 +778,7 @@ void window_themes_paint(rct_window *w, rct_drawpixelinfo *dpi)
         size_t activeAvailableThemeIndex = theme_manager_get_active_available_theme_index();
         const utf8 * activeThemeName = theme_manager_get_available_theme_name(activeAvailableThemeIndex);
         set_format_arg(0, uintptr_t, (uintptr_t)activeThemeName);
-        gfx_draw_string_left(dpi, STR_THEMES_LABEL_CURRENT_THEME, NULL, w->colours[1], w->x + 10, w->y + window_themes_widgets[WIDX_THEMES_PRESETS].top + 1);
+        gfx_draw_string_left(dpi, STR_THEMES_LABEL_CURRENT_THEME, nullptr, w->colours[1], w->x + 10, w->y + window_themes_widgets[WIDX_THEMES_PRESETS].top + 1);
         gfx_draw_string_left_clipped(
             dpi,
             STR_STRING,
@@ -837,7 +837,7 @@ void window_themes_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scr
             rct_windowclass wc = get_window_class_tab_index(i);
             sint32 numColours = theme_desc_get_num_colours(wc);
             for (uint8 j = 0; j < numColours; j++) {
-                gfx_draw_string_left(dpi, theme_desc_get_name(wc), NULL, w->colours[1], 2, y + 4);
+                gfx_draw_string_left(dpi, theme_desc_get_name(wc), nullptr, w->colours[1], 2, y + 4);
 
                 uint8 colour = theme_get_colour(wc, j);
                 uint32 image = SPRITE_ID_PALETTE_COLOUR_1(colour & ~COLOUR_FLAG_TRANSLUCENT) | IMAGE_TYPE_TRANSPARENT | SPR_PALETTE_BTN;
diff --git a/src/openrct2-ui/windows/TitleExit.cpp b/src/openrct2-ui/windows/TitleExit.cpp
index 73030c98f7..dd467a9165 100644
--- a/src/openrct2-ui/windows/TitleExit.cpp
+++ b/src/openrct2-ui/windows/TitleExit.cpp
@@ -39,34 +39,34 @@ static void window_title_exit_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_title_exit_mouseup(rct_window *w, rct_widgetindex widgetIndex);
 
 static rct_window_event_list window_title_exit_events = {
-    NULL,
+    nullptr,
     window_title_exit_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_exit_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2-ui/windows/TitleLogo.cpp b/src/openrct2-ui/windows/TitleLogo.cpp
index 8c895451e3..5ec96a3d21 100644
--- a/src/openrct2-ui/windows/TitleLogo.cpp
+++ b/src/openrct2-ui/windows/TitleLogo.cpp
@@ -30,34 +30,34 @@ static rct_widget window_title_logo_widgets[] = {
 static void window_title_logo_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_title_logo_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_logo_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2-ui/windows/TitleMenu.cpp b/src/openrct2-ui/windows/TitleMenu.cpp
index 8383bf1d27..99ba4d4530 100644
--- a/src/openrct2-ui/windows/TitleMenu.cpp
+++ b/src/openrct2-ui/windows/TitleMenu.cpp
@@ -54,34 +54,34 @@ static void window_title_menu_cursor(rct_window *w, rct_widgetindex widgetIndex,
 static void window_title_menu_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_title_menu_events = {
-    NULL,
+    nullptr,
     window_title_menu_mouseup,
-    NULL,
+    nullptr,
     window_title_menu_mousedown,
     window_title_menu_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_menu_cursor,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_title_menu_paint,
-    NULL
+    nullptr
 };
 
 /**
@@ -141,12 +141,12 @@ static void window_title_menu_scenarioselect_callback(const utf8 *path)
 
 static void window_title_menu_mouseup(rct_window *w, rct_widgetindex widgetIndex)
 {
-    rct_window *windowToOpen = NULL;
+    rct_window *windowToOpen = nullptr;
 
     switch (widgetIndex) {
     case WIDX_START_NEW_GAME:
         windowToOpen = window_find_by_class(WC_SCENARIO_SELECT);
-        if (windowToOpen != NULL) {
+        if (windowToOpen != nullptr) {
             window_bring_to_front(windowToOpen);
         }
         else {
@@ -157,7 +157,7 @@ static void window_title_menu_mouseup(rct_window *w, rct_widgetindex widgetIndex
         break;
     case WIDX_CONTINUE_SAVED_GAME:
         windowToOpen = window_find_by_class(WC_LOADSAVE);
-        if (windowToOpen != NULL) {
+        if (windowToOpen != nullptr) {
             window_bring_to_front(windowToOpen);
         }
         else {
@@ -168,7 +168,7 @@ static void window_title_menu_mouseup(rct_window *w, rct_widgetindex widgetIndex
         break;
     case WIDX_MULTIPLAYER:
         windowToOpen = window_find_by_class(WC_SERVER_LIST);
-        if (windowToOpen != NULL) {
+        if (windowToOpen != nullptr) {
             window_bring_to_front(windowToOpen);
         }
         else {
diff --git a/src/openrct2-ui/windows/TitleOptions.cpp b/src/openrct2-ui/windows/TitleOptions.cpp
index 3155b22661..a5ab834e11 100644
--- a/src/openrct2-ui/windows/TitleOptions.cpp
+++ b/src/openrct2-ui/windows/TitleOptions.cpp
@@ -38,34 +38,34 @@ static void window_title_options_mouseup(rct_window *w, rct_widgetindex widgetIn
 static void window_title_options_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_title_options_events = {
-    NULL,
+    nullptr,
     window_title_options_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_options_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2-ui/windows/ViewClipping.cpp b/src/openrct2-ui/windows/ViewClipping.cpp
index 817a500fc3..9f1f45579e 100644
--- a/src/openrct2-ui/windows/ViewClipping.cpp
+++ b/src/openrct2-ui/windows/ViewClipping.cpp
@@ -74,32 +74,32 @@ static void window_view_clipping_close();
 static rct_window_event_list window_view_clipping_events = {
     window_view_clipping_close_button,
     window_view_clipping_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_view_clipping_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_view_clipping_scrollgetsize,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_view_clipping_invalidate,
     window_view_clipping_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -121,7 +121,7 @@ rct_window * window_view_clipping_open()
 
     // Check if window is already open
     window = window_find_by_class(WC_VIEW_CLIPPING);
-    if (window != NULL) {
+    if (window != nullptr) {
         return window;
     }
 
@@ -143,7 +143,7 @@ rct_window * window_view_clipping_open()
     window_push_others_below(window);
 
     // Turn on view clipping when the window is opened.
-    if (mainWindow != NULL) {
+    if (mainWindow != nullptr) {
         mainWindow->viewport->flags |= VIEWPORT_FLAG_PAINT_CLIP_TO_HEIGHT;
         window_invalidate(mainWindow);
     }
@@ -155,7 +155,7 @@ static void window_view_clipping_close()
 {
     // Turn off view clipping when the window is closed.
     rct_window *mainWindow = window_get_main();
-    if (mainWindow != NULL) {
+    if (mainWindow != nullptr) {
         mainWindow->viewport->flags &= ~VIEWPORT_FLAG_PAINT_CLIP_TO_HEIGHT;
         window_invalidate(mainWindow);
     }
@@ -179,7 +179,7 @@ static void window_view_clipping_mouseup(rct_window *w, rct_widgetindex widgetIn
     case WIDX_CLIP_HEIGHT_CHECKBOX:
         // Toggle height clipping.
         mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             mainWindow->viewport->flags ^= VIEWPORT_FLAG_PAINT_CLIP_TO_HEIGHT;
             window_invalidate(mainWindow);
         }
@@ -189,14 +189,14 @@ static void window_view_clipping_mouseup(rct_window *w, rct_widgetindex widgetIn
         if (gClipHeight < 255)
             window_view_clipping_set_clipheight(w, gClipHeight + 1);
         mainWindow = window_get_main();
-        if (mainWindow != NULL)
+        if (mainWindow != nullptr)
             window_invalidate(mainWindow);
         break;
     case WIDX_CLIP_HEIGHT_DECREASE:
         if (gClipHeight > 0)
             window_view_clipping_set_clipheight(w, gClipHeight - 1);
         mainWindow = window_get_main();
-        if (mainWindow != NULL)
+        if (mainWindow != nullptr)
             window_invalidate(mainWindow);
         break;
     case WIDX_CLIP_HEIGHT_VALUE:
@@ -225,7 +225,7 @@ static void window_view_clipping_update(rct_window *w)
 
         // Update the main window accordingly.
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             window_invalidate(mainWindow);
         }
     }
@@ -237,7 +237,7 @@ static void window_view_clipping_invalidate(rct_window *w)
     widget_scroll_update_thumbs(w, WIDX_CLIP_HEIGHT_SLIDER);
 
     rct_window *mainWindow = window_get_main();
-    if (mainWindow != NULL) {
+    if (mainWindow != nullptr) {
         widget_set_checkbox_value(w, WIDX_CLIP_HEIGHT_CHECKBOX, mainWindow->viewport->flags & VIEWPORT_FLAG_PAINT_CLIP_TO_HEIGHT);
     }
 }
@@ -249,7 +249,7 @@ static void window_view_clipping_paint(rct_window *w, rct_drawpixelinfo *dpi)
     // Clip height value
     sint32 x = w->x + 8;
     sint32 y = w->y + w->widgets[WIDX_CLIP_HEIGHT_VALUE].top;
-    gfx_draw_string_left(dpi, STR_VIEW_CLIPPING_HEIGHT_VALUE, NULL, w->colours[0], x, y);
+    gfx_draw_string_left(dpi, STR_VIEW_CLIPPING_HEIGHT_VALUE, nullptr, w->colours[0], x, y);
 
     x = w->x + w->widgets[WIDX_CLIP_HEIGHT_VALUE].left + 1;
     y = w->y + w->widgets[WIDX_CLIP_HEIGHT_VALUE].top;
diff --git a/src/openrct2-ui/windows/Viewport.cpp b/src/openrct2-ui/windows/Viewport.cpp
index 9c50de310a..10c9c50909 100644
--- a/src/openrct2-ui/windows/Viewport.cpp
+++ b/src/openrct2-ui/windows/Viewport.cpp
@@ -60,34 +60,34 @@ static void window_viewport_invalidate(rct_window *w);
 static void window_viewport_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_viewport_events = {
-    NULL,
+    nullptr,
     window_viewport_mouseup,
     window_viewport_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_viewport_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_viewport_invalidate,
     window_viewport_paint,
-    NULL
+    nullptr
 };
 
 static sint32 _viewportNumber = 1;
@@ -114,7 +114,7 @@ rct_window * window_viewport_open()
     // Create viewport
     viewport_create(w, w->x, w->y, w->width, w->height, 0, 128 * 32, 128 * 32, 0, 1, -1);
     rct_window *mainWindow = window_get_main();
-    if (mainWindow != NULL) {
+    if (mainWindow != nullptr) {
         rct_viewport *mainViewport = mainWindow->viewport;
         sint32 x = mainViewport->view_x + (mainViewport->view_width / 2);
         sint32 y = mainViewport->view_y + (mainViewport->view_height / 2);
@@ -148,21 +148,21 @@ static void window_viewport_mouseup(rct_window *w, rct_widgetindex widgetIndex)
         window_close(w);
         break;
     case WIDX_ZOOM_IN:
-        if (w->viewport != NULL && w->viewport->zoom > 0) {
+        if (w->viewport != nullptr && w->viewport->zoom > 0) {
             w->viewport->zoom--;
             window_invalidate(w);
         }
         break;
     case WIDX_ZOOM_OUT:
-        if (w->viewport != NULL && w->viewport->zoom < 3) {
+        if (w->viewport != nullptr && w->viewport->zoom < 3) {
             w->viewport->zoom++;
             window_invalidate(w);
         }
         break;
     case WIDX_LOCATE:
         mainWindow = window_get_main();
-        if (mainWindow != NULL) {
-            get_map_coordinates_from_pos(w->x + (w->width / 2), w->y + (w->height / 2), VIEWPORT_INTERACTION_MASK_NONE, &x, &y, NULL, NULL, NULL);
+        if (mainWindow != nullptr) {
+            get_map_coordinates_from_pos(w->x + (w->width / 2), w->y + (w->height / 2), VIEWPORT_INTERACTION_MASK_NONE, &x, &y, nullptr, nullptr, nullptr);
             window_scroll_to_location(mainWindow, x, y, map_element_height(x, y));
         }
         break;
@@ -180,7 +180,7 @@ static void window_viewport_update(rct_window *w)
     rct_window *mainWindow;
 
     mainWindow = window_get_main();
-    if (mainWindow == NULL)
+    if (mainWindow == nullptr)
         return;
 
     if (w->viewport->flags != mainWindow->viewport->flags) {
@@ -233,6 +233,6 @@ static void window_viewport_paint(rct_window *w, rct_drawpixelinfo *dpi)
     window_draw_widgets(w, dpi);
 
     // Draw viewport
-    if (w->viewport != NULL)
+    if (w->viewport != nullptr)
         window_draw_viewport(dpi, w);
 }
diff --git a/src/openrct2-ui/windows/Water.cpp b/src/openrct2-ui/windows/Water.cpp
index df48a6d967..0d1d3cc08c 100644
--- a/src/openrct2-ui/windows/Water.cpp
+++ b/src/openrct2-ui/windows/Water.cpp
@@ -58,32 +58,32 @@ static void window_water_inputsize(rct_window *w);
 static rct_window_event_list window_water_events = {
     window_water_close,
     window_water_mouseup,
-    NULL,
+    nullptr,
     window_water_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_water_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_water_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_water_invalidate,
     window_water_paint,
-    NULL
+    nullptr
 };
 
 /**
@@ -173,7 +173,7 @@ static void window_water_textinput(rct_window *w, rct_widgetindex widgetIndex, c
     sint32 size;
     char* end;
 
-    if (widgetIndex != WIDX_PREVIEW || text == NULL)
+    if (widgetIndex != WIDX_PREVIEW || text == nullptr)
         return;
 
     size = strtol(text, &end, 10);
diff --git a/src/openrct2/PlatformEnvironment.cpp b/src/openrct2/PlatformEnvironment.cpp
index 1740b29996..b79eb7c749 100644
--- a/src/openrct2/PlatformEnvironment.cpp
+++ b/src/openrct2/PlatformEnvironment.cpp
@@ -109,7 +109,7 @@ IPlatformEnvironment * OpenRCT2::CreatePlatformEnvironment()
     utf8 userPath[MAX_PATH];
     platform_resolve_openrct_data_path();
     platform_resolve_user_data_path();
-    platform_get_user_directory(userPath, NULL, sizeof(userPath));
+    platform_get_user_directory(userPath, nullptr, sizeof(userPath));
     if (!platform_ensure_directory_exists(userPath))
     {
         Console::Error::WriteLine("Could not create user directory (do you have write access to your documents folder?)");
diff --git a/src/openrct2/audio/Audio.cpp b/src/openrct2/audio/Audio.cpp
index 4cc477995d..f470c3de38 100644
--- a/src/openrct2/audio/Audio.cpp
+++ b/src/openrct2/audio/Audio.cpp
@@ -138,7 +138,7 @@ void audio_init()
 {
     if (str_is_null_or_empty(gConfigSound.device))
     {
-        Mixer_Init(NULL);
+        Mixer_Init(nullptr);
         gAudioCurrentDevice = 0;
     }
     else
diff --git a/src/openrct2/cmdline/RootCommands.cpp b/src/openrct2/cmdline/RootCommands.cpp
index aa4b1ca604..829240b60c 100644
--- a/src/openrct2/cmdline/RootCommands.cpp
+++ b/src/openrct2/cmdline/RootCommands.cpp
@@ -365,7 +365,7 @@ static exitcode_t HandleCommandSetRCT2(CommandLineArgEnumerator * enumerator)
     // Check user path that will contain the config
     utf8 userPath[MAX_PATH];
     platform_resolve_user_data_path();
-    platform_get_user_directory(userPath, NULL, sizeof(userPath));
+    platform_get_user_directory(userPath, nullptr, sizeof(userPath));
     if (!platform_ensure_directory_exists(userPath)) {
         Console::Error::WriteLine("Unable to access or create directory '%s'.", userPath);
         return EXITCODE_FAIL;
diff --git a/src/openrct2/core/Path.cpp b/src/openrct2/core/Path.cpp
index b7fa7afca5..2bb10b6622 100644
--- a/src/openrct2/core/Path.cpp
+++ b/src/openrct2/core/Path.cpp
@@ -182,7 +182,7 @@ namespace Path
 #ifdef _WIN32
         wchar_t * relativePathW = utf8_to_widechar(relativePath);
         wchar_t   absolutePathW[MAX_PATH];
-        DWORD length = GetFullPathNameW(relativePathW, (DWORD)Util::CountOf(absolutePathW), absolutePathW, NULL);
+        DWORD length = GetFullPathNameW(relativePathW, (DWORD)Util::CountOf(absolutePathW), absolutePathW, nullptr);
         Memory::Free(relativePathW);
         if (length == 0)
         {
@@ -196,7 +196,7 @@ namespace Path
             return buffer;
         }
 #else
-        utf8 * absolutePath = realpath(relativePath, NULL);
+        utf8 * absolutePath = realpath(relativePath, nullptr);
         if (absolutePath == nullptr)
         {
             return String::Set(buffer, bufferSize, relativePath);
diff --git a/src/openrct2/core/ZipAndroid.cpp b/src/openrct2/core/ZipAndroid.cpp
index 04d3e5cb7e..726bb82281 100644
--- a/src/openrct2/core/ZipAndroid.cpp
+++ b/src/openrct2/core/ZipAndroid.cpp
@@ -166,7 +166,7 @@ JNIEXPORT jlong JNICALL
 Java_website_openrct2_ZipArchive_allocBytes(JNIEnv *env, jclass, jbyteArray input,
                                                 jint numBytes) {
 
-    jbyte *bufferPtr = env->GetByteArrayElements(input, NULL);
+    jbyte *bufferPtr = env->GetByteArrayElements(input, nullptr);
 
     void *data = Memory::Allocate<void>((size_t) numBytes);
     memcpy(data, bufferPtr, numBytes);
diff --git a/src/openrct2/drawing/X8DrawingEngine.cpp b/src/openrct2/drawing/X8DrawingEngine.cpp
index a716b08447..262d676916 100644
--- a/src/openrct2/drawing/X8DrawingEngine.cpp
+++ b/src/openrct2/drawing/X8DrawingEngine.cpp
@@ -388,7 +388,7 @@ void X8DrawingEngine::ResetWindowVisbilities()
     for (rct_window *w = g_window_list; w < gWindowNextSlot; w++)
     {
         w->visibility = VC_UNKNOWN;
-        if (w->viewport != NULL) w->viewport->visibility = VC_UNKNOWN;
+        if (w->viewport != nullptr) w->viewport->visibility = VC_UNKNOWN;
     }
 }
 
diff --git a/src/openrct2/interface/Screenshot.cpp b/src/openrct2/interface/Screenshot.cpp
index 4a6e649e8c..6ce30634e8 100644
--- a/src/openrct2/interface/Screenshot.cpp
+++ b/src/openrct2/interface/Screenshot.cpp
@@ -159,7 +159,7 @@ void screenshot_giant()
     sint32 originalZoom = 0;
 
     rct_window *mainWindow = window_get_main();
-    if (mainWindow != NULL && mainWindow->viewport != NULL)
+    if (mainWindow != nullptr && mainWindow->viewport != nullptr)
         originalZoom = mainWindow->viewport->zoom;
 
     sint32 rotation = originalRotation;
diff --git a/src/openrct2/network/Http.cpp b/src/openrct2/network/Http.cpp
index f5c015cf2a..a930df2278 100644
--- a/src/openrct2/network/Http.cpp
+++ b/src/openrct2/network/Http.cpp
@@ -159,34 +159,34 @@ static http_response_t *http_request(const HttpRequest2 &request)
     write_buffer writeBuffer;
 
     curl = curl_easy_init();
-    if (curl == NULL)
-        return NULL;
+    if (curl == nullptr)
+        return nullptr;
 
-    if (request.Type == HTTP_DATA_JSON && request.Body.Json != NULL) {
+    if (request.Type == HTTP_DATA_JSON && request.Body.Json != nullptr) {
         readBuffer.ptr = json_dumps(request.Body.Json, JSON_COMPACT);
         readBuffer.length = strlen(readBuffer.ptr);
         readBuffer.position = 0;
-    } else if (request.Type == HTTP_DATA_RAW && request.Body.Buffer != NULL) {
+    } else if (request.Type == HTTP_DATA_RAW && request.Body.Buffer != nullptr) {
         readBuffer.ptr = request.Body.Buffer;
         readBuffer.length = request.Size;
         readBuffer.position = 0;
     }
 
-    writeBuffer.ptr = NULL;
+    writeBuffer.ptr = nullptr;
     writeBuffer.length = 0;
     writeBuffer.capacity = 0;
 
-    curl_slist *headers = NULL;
+    curl_slist *headers = nullptr;
 
     if (request.Type == HTTP_DATA_JSON) {
         headers = curl_slist_append(headers, "Accept: " MIME_TYPE_APPLICATION_JSON);
 
-        if (request.Body.Json != NULL) {
+        if (request.Body.Json != nullptr) {
             headers = curl_slist_append(headers, "Content-Type: " MIME_TYPE_APPLICATION_JSON);
         }
     }
 
-    if (readBuffer.ptr != NULL) {
+    if (readBuffer.ptr != nullptr) {
         char contentLengthHeaderValue[64];
         snprintf(contentLengthHeaderValue, sizeof(contentLengthHeaderValue), "Content-Length: %zu", readBuffer.length);
         headers = curl_slist_append(headers, contentLengthHeaderValue);
@@ -205,16 +205,16 @@ static http_response_t *http_request(const HttpRequest2 &request)
 
     curlResult = curl_easy_perform(curl);
 
-    if (request.Type == HTTP_DATA_JSON && request.Body.Json != NULL) {
+    if (request.Type == HTTP_DATA_JSON && request.Body.Json != nullptr) {
         free(readBuffer.ptr);
     }
 
     if (curlResult != CURLE_OK) {
         log_error("HTTP request failed: %s.", curl_easy_strerror(curlResult));
-        if (writeBuffer.ptr != NULL)
+        if (writeBuffer.ptr != nullptr)
             free(writeBuffer.ptr);
 
-        return NULL;
+        return nullptr;
     }
 
     long httpStatusCode;
@@ -229,14 +229,14 @@ static http_response_t *http_request(const HttpRequest2 &request)
     writeBuffer.capacity = writeBuffer.length;
     writeBuffer.ptr[writeBuffer.length - 1] = 0;
 
-    response = NULL;
+    response = nullptr;
 
     // Parse as JSON if response is JSON
-    if (contentType != NULL && strstr(contentType, "json") != NULL) {
+    if (contentType != nullptr && strstr(contentType, "json") != nullptr) {
         json_t *root;
         json_error_t error;
         root = json_loads(writeBuffer.ptr, 0, &error);
-        if (root != NULL) {
+        if (root != nullptr) {
             response = (http_response_t*) malloc(sizeof(http_response_t));
             response->tag = request.Tag;
             response->status_code = (sint32) httpStatusCode;
@@ -272,9 +272,9 @@ void http_request_async(const http_request_t * request, void (*callback)(http_re
 
 void http_request_dispose(http_response_t *response)
 {
-    if (response->type == HTTP_DATA_JSON && response->root != NULL)
+    if (response->type == HTTP_DATA_JSON && response->root != nullptr)
         json_decref(response->root);
-    else if (response->type == HTTP_DATA_RAW && response->body != NULL)
+    else if (response->type == HTTP_DATA_RAW && response->body != nullptr)
         free(response->body);
 
     free(response);
@@ -285,7 +285,7 @@ const char *http_get_extension_from_url(const char *url, const char *fallback)
     const char *extension = strrchr(url, '.');
 
     // Assume a save file by default if no valid extension can be determined
-    if (extension == NULL || strchr(extension, '/') != NULL) {
+    if (extension == nullptr || strchr(extension, '/') != nullptr) {
         return fallback;
     } else {
         return extension;
@@ -302,19 +302,19 @@ size_t http_download_park(const char * url, void * * outData)
 
     http_response_t *response = http_request(request);
 
-    if (response == NULL || response->status_code != 200) {
+    if (response == nullptr || response->status_code != 200) {
         Console::Error::WriteLine("Failed to download '%s'", request.Url.c_str());
-        if (response != NULL) {
+        if (response != nullptr) {
             http_request_dispose(response);
         }
 
-        *outData = NULL;
+        *outData = nullptr;
         return 0;
     }
 
     size_t dataSize = response->size - 1;
     void * data = malloc(dataSize);
-    if (data == NULL) {
+    if (data == nullptr) {
         dataSize = 0;
         Console::Error::WriteLine("Failed to allocate memory for downloaded park.");
     } else {
diff --git a/src/openrct2/network/Network.cpp b/src/openrct2/network/Network.cpp
index 21a973b991..906cd223cc 100644
--- a/src/openrct2/network/Network.cpp
+++ b/src/openrct2/network/Network.cpp
@@ -450,7 +450,7 @@ void Network::UpdateClient()
             {
                 _lastConnectStatus = SOCKET_STATUS_RESOLVING;
                 char str_resolving[256];
-                format_string(str_resolving, 256, STR_MULTIPLAYER_RESOLVING, NULL);
+                format_string(str_resolving, 256, STR_MULTIPLAYER_RESOLVING, nullptr);
                 window_network_status_open(str_resolving, []() -> void {
                     gNetwork.Close();
                 });
@@ -463,7 +463,7 @@ void Network::UpdateClient()
             {
                 _lastConnectStatus = SOCKET_STATUS_CONNECTING;
                 char str_connecting[256];
-                format_string(str_connecting, 256, STR_MULTIPLAYER_CONNECTING, NULL);
+                format_string(str_connecting, 256, STR_MULTIPLAYER_CONNECTING, nullptr);
                 window_network_status_open(str_connecting, []() -> void {
                     gNetwork.Close();
                 });
@@ -477,7 +477,7 @@ void Network::UpdateClient()
             server_connection->ResetLastPacketTime();
             Client_Send_TOKEN();
             char str_authenticating[256];
-            format_string(str_authenticating, 256, STR_MULTIPLAYER_AUTHENTICATING, NULL);
+            format_string(str_authenticating, 256, STR_MULTIPLAYER_AUTHENTICATING, nullptr);
             window_network_status_open(str_authenticating, []() -> void {
                 gNetwork.Close();
             });
@@ -511,10 +511,10 @@ void Network::UpdateClient()
                     const char * disconnect_reason = server_connection->GetLastDisconnectReason();
                     format_string(str_disconnected, 256, STR_MULTIPLAYER_DISCONNECTED_WITH_REASON, &disconnect_reason);
                 } else {
-                    format_string(str_disconnected, 256, STR_MULTIPLAYER_DISCONNECTED_NO_REASON, NULL);
+                    format_string(str_disconnected, 256, STR_MULTIPLAYER_DISCONNECTED_NO_REASON, nullptr);
                 }
 
-                window_network_status_open(str_disconnected, NULL);
+                window_network_status_open(str_disconnected, nullptr);
             }
             Close();
         }
@@ -634,7 +634,7 @@ void Network::KickPlayer(sint32 playerId)
             // Disconnect the client gracefully
             (*it)->SetLastDisconnectReason(STR_MULTIPLAYER_KICKED);
             char str_disconnect_msg[256];
-            format_string(str_disconnect_msg, 256, STR_MULTIPLAYER_KICKED_REASON, NULL);
+            format_string(str_disconnect_msg, 256, STR_MULTIPLAYER_KICKED_REASON, nullptr);
             Server_Send_SETDISCONNECTMSG(*(*it), str_disconnect_msg);
             (*it)->Socket->Disconnect();
             break;
@@ -747,7 +747,7 @@ void Network::SaveGroups()
     if (GetMode() == NETWORK_MODE_SERVER) {
         utf8 path[MAX_PATH];
 
-        platform_get_user_directory(path, NULL, sizeof(path));
+        platform_get_user_directory(path, nullptr, sizeof(path));
         safe_strcat_path(path, "groups.json", sizeof(path));
 
         json_t * jsonGroupsCfg = json_object();
@@ -803,7 +803,7 @@ void Network::LoadGroups()
 
     utf8 path[MAX_PATH];
 
-    platform_get_user_directory(path, NULL, sizeof(path));
+    platform_get_user_directory(path, nullptr, sizeof(path));
     safe_strcat_path(path, "groups.json", sizeof(path));
 
     json_t * json = nullptr;
@@ -903,9 +903,9 @@ void Network::BeginServerLog()
     // Log server start event
     utf8 logMessage[256];
     if (GetMode() == NETWORK_MODE_CLIENT) {
-        format_string(logMessage, sizeof(logMessage), STR_LOG_CLIENT_STARTED, NULL);
+        format_string(logMessage, sizeof(logMessage), STR_LOG_CLIENT_STARTED, nullptr);
     } else if (GetMode() == NETWORK_MODE_SERVER) {
-        format_string(logMessage, sizeof(logMessage), STR_LOG_SERVER_STARTED, NULL);
+        format_string(logMessage, sizeof(logMessage), STR_LOG_SERVER_STARTED, nullptr);
     }
     AppendServerLog(logMessage);
 }
@@ -922,9 +922,9 @@ void Network::CloseServerLog()
     // Log server stopped event
     char logMessage[256];
     if (GetMode() == NETWORK_MODE_CLIENT) {
-        format_string(logMessage, sizeof(logMessage), STR_LOG_CLIENT_STOPPED, NULL);
+        format_string(logMessage, sizeof(logMessage), STR_LOG_CLIENT_STOPPED, nullptr);
     } else if (GetMode() == NETWORK_MODE_SERVER) {
-        format_string(logMessage, sizeof(logMessage), STR_LOG_SERVER_STOPPED, NULL);
+        format_string(logMessage, sizeof(logMessage), STR_LOG_SERVER_STOPPED, nullptr);
     }
     AppendServerLog(logMessage);
 }
@@ -1060,7 +1060,7 @@ uint8 * Network::save_for_network(size_t &out_size, const std::vector<const Obje
     sint32 size = ms.GetLength();
 
     uint8 *compressed = util_zlib_deflate((const uint8 *)data, size, &out_size);
-    if (compressed != NULL)
+    if (compressed != nullptr)
     {
         header = (uint8 *)_strdup("open2_sv6_zlib");
         size_t header_len = strlen((char *)header) + 1; // account for null terminator
@@ -1387,8 +1387,8 @@ void Network::ProcessGameCommandQueue()
         _desynchronised = true;
 
         char str_desync[256];
-        format_string(str_desync, 256, STR_MULTIPLAYER_DESYNC, NULL);
-        window_network_status_open(str_desync, NULL);
+        format_string(str_desync, 256, STR_MULTIPLAYER_DESYNC, nullptr);
+        window_network_status_open(str_desync, nullptr);
         if (!gConfigNetwork.stay_connected) {
             Close();
         }
@@ -1849,7 +1849,7 @@ void Network::Client_Handle_MAP(NetworkConnection& connection, NetworkPacket& pa
             has_to_free = true;
             size_t header_len = strlen("open2_sv6_zlib") + 1;
             data = util_zlib_inflate(&chunk_buffer[header_len], size - header_len, &data_size);
-            if (data == NULL)
+            if (data == nullptr)
             {
                 log_warning("Failed to decompress data sent from server.");
                 Close();
diff --git a/src/openrct2/network/NetworkKey.cpp b/src/openrct2/network/NetworkKey.cpp
index ff18414ed4..50a46146eb 100644
--- a/src/openrct2/network/NetworkKey.cpp
+++ b/src/openrct2/network/NetworkKey.cpp
@@ -353,7 +353,7 @@ bool NetworkKey::Sign(const uint8 * md, const size_t len, char ** signature, siz
     *signature = nullptr;
 
     /* Create the Message Digest Context */
-    if ((mdctx = EVP_MD_CTX_create()) == NULL)
+    if ((mdctx = EVP_MD_CTX_create()) == nullptr)
     {
         log_error("Failed to create MD context");
         return false;
@@ -385,7 +385,7 @@ bool NetworkKey::Sign(const uint8 * md, const size_t len, char ** signature, siz
 
     uint8 * sig;
     /* Allocate memory for the signature based on size in slen */
-    if ((sig = (unsigned char*)malloc((sint32)(sizeof(unsigned char) * (*out_size)))) == NULL)
+    if ((sig = (unsigned char*)malloc((sint32)(sizeof(unsigned char) * (*out_size)))) == nullptr)
     {
         log_error("Failed to crypto-allocate space for signature");
         EVP_MD_CTX_destroy(mdctx);
@@ -411,7 +411,7 @@ bool NetworkKey::Verify(const uint8 * md, const size_t len, const char * sig, co
     EVP_MD_CTX * mdctx = nullptr;
 
     /* Create the Message Digest Context */
-    if ((mdctx = EVP_MD_CTX_create()) == NULL)
+    if ((mdctx = EVP_MD_CTX_create()) == nullptr)
     {
         log_error("Failed to create MD context");
         return false;
diff --git a/src/openrct2/network/Twitch.cpp b/src/openrct2/network/Twitch.cpp
index 784aae51ce..7452834093 100644
--- a/src/openrct2/network/Twitch.cpp
+++ b/src/openrct2/network/Twitch.cpp
@@ -280,7 +280,7 @@ namespace Twitch
         http_request_t request = {};
         request.url = url;
         request.method = HTTP_METHOD_GET;
-        request.body = NULL;
+        request.body = nullptr;
         request.type = HTTP_DATA_JSON;
         http_request_async(&request, [](http_response_t * jsonResponse) -> void
         {
@@ -354,7 +354,7 @@ namespace Twitch
         }
 
         http_request_dispose(_twitchJsonResponse);
-        _twitchJsonResponse = NULL;
+        _twitchJsonResponse = nullptr;
         _twitchState = TWITCH_STATE_JOINED;
 
         gfx_invalidate_screen();
@@ -420,7 +420,7 @@ namespace Twitch
             if (is_user_string_id(peep->name_string_idx))
             {
                 utf8 buffer[256];
-                format_string(buffer, 256, peep->name_string_idx, NULL);
+                format_string(buffer, 256, peep->name_string_idx, nullptr);
 
                 AudienceMember * member = nullptr;
                 for (AudienceMember &m : members)
diff --git a/src/openrct2/object/RideObject.cpp b/src/openrct2/object/RideObject.cpp
index bfba7638c3..9211bf1af6 100644
--- a/src/openrct2/object/RideObject.cpp
+++ b/src/openrct2/object/RideObject.cpp
@@ -404,14 +404,14 @@ void RideObject::SetRepositoryItem(ObjectRepositoryItem * item) const
 
     const ride_group * rideGroup = get_ride_group(rideTypeIdx, (rct_ride_entry *)&_legacyType);
 
-    // If the ride group is NULL, the track type does not have ride groups.
-    if (rideGroup != NULL)
+    // If the ride group is nullptr, the track type does not have ride groups.
+    if (rideGroup != nullptr)
     {
         for (uint8 i = rideGroupIndex + 1; i < MAX_RIDE_GROUPS_PER_RIDE_TYPE; i++)
         {
             ride_group * irg = ride_group_find(rideTypeIdx, i);
 
-            if (irg != NULL)
+            if (irg != nullptr)
             {
                 if (ride_groups_are_equal(irg, rideGroup))
                 {
diff --git a/src/openrct2/platform/Crash.cpp b/src/openrct2/platform/Crash.cpp
index b4005a32af..da360c3248 100644
--- a/src/openrct2/platform/Crash.cpp
+++ b/src/openrct2/platform/Crash.cpp
@@ -64,7 +64,7 @@ static bool OnCrash(const wchar_t * dumpPath,
         printf("%s\n", DumpFailedMessage);
         if (!gOpenRCT2SilentBreakpad)
         {
-            MessageBoxA(NULL, DumpFailedMessage, OPENRCT2_NAME, MB_OK | MB_ICONERROR);
+            MessageBoxA(nullptr, DumpFailedMessage, OPENRCT2_NAME, MB_OK | MB_ICONERROR);
         }
         return succeeded;
     }
@@ -118,8 +118,8 @@ static bool OnCrash(const wchar_t * dumpPath,
                _wszCommitSha1Short);
 
     // Cannot use platform_show_messagebox here, it tries to set parent window already dead.
-    MessageBoxW(NULL, message, WSZ(OPENRCT2_NAME), MB_OK | MB_ICONERROR);
-    HRESULT coInitializeResult = CoInitialize(NULL);
+    MessageBoxW(nullptr, message, WSZ(OPENRCT2_NAME), MB_OK | MB_ICONERROR);
+    HRESULT coInitializeResult = CoInitialize(nullptr);
     if (SUCCEEDED(coInitializeResult))
     {
         LPITEMIDLIST pidl = ILCreateFromPathW(dumpPath);
@@ -149,7 +149,7 @@ static bool OnCrash(const wchar_t * dumpPath,
 static std::wstring GetDumpDirectory()
 {
     char userDirectory[MAX_PATH];
-    platform_get_user_directory(userDirectory, NULL, sizeof(userDirectory));
+    platform_get_user_directory(userDirectory, nullptr, sizeof(userDirectory));
 
     wchar_t * userDirectoryW = utf8_to_widechar(userDirectory);
     auto result = std::wstring(userDirectoryW);
diff --git a/src/openrct2/ride/RideGroupManager.cpp b/src/openrct2/ride/RideGroupManager.cpp
index 3d051400e9..ea942ab6e3 100644
--- a/src/openrct2/ride/RideGroupManager.cpp
+++ b/src/openrct2/ride/RideGroupManager.cpp
@@ -118,7 +118,7 @@ public:
                 else
                     return (ride_group *) &ride_group_hyper_twister;
             default:
-                return NULL;
+                return nullptr;
         }
     }
 
@@ -159,7 +159,7 @@ public:
                 rideGroup = (ride_group *) &twister_rc_groups[index];
                 break;
             default:
-                return NULL;
+                return nullptr;
         }
 
         return rideGroup;
@@ -167,7 +167,7 @@ public:
 
     bool RideGroupsAreEqual(const ride_group * a, const ride_group * b) const override
     {
-        if (a != NULL && b != NULL && (a->naming.name == b->naming.name && a->naming.description == b->naming.description))
+        if (a != nullptr && b != nullptr && (a->naming.name == b->naming.name && a->naming.description == b->naming.description))
         {
             return true;
         }
diff --git a/src/openrct2/ride/TrackDesignRepository.cpp b/src/openrct2/ride/TrackDesignRepository.cpp
index fa39260632..944559417e 100644
--- a/src/openrct2/ride/TrackDesignRepository.cpp
+++ b/src/openrct2/ride/TrackDesignRepository.cpp
@@ -146,7 +146,7 @@ public:
             uint8 rideGroupIndex = (ori != nullptr) ? ori->RideGroupIndex : 0;
             ride_group * itemRideGroup = ride_group_find(rideType, rideGroupIndex);
 
-            if (itemRideGroup != NULL && ride_groups_are_equal(itemRideGroup, rideGroup))
+            if (itemRideGroup != nullptr && ride_groups_are_equal(itemRideGroup, rideGroup))
             {
                 count++;
             }
@@ -212,7 +212,7 @@ public:
             uint8 rideGroupIndex = (ori != nullptr) ? ori->RideGroupIndex : 0;
             ride_group * itemRideGroup = ride_group_find(rideType, rideGroupIndex);
 
-            if (itemRideGroup != NULL && ride_groups_are_equal(itemRideGroup, rideGroup))
+            if (itemRideGroup != nullptr && ride_groups_are_equal(itemRideGroup, rideGroup))
             {
                 track_design_file_ref ref;
                 ref.name = String::Duplicate(GetNameFromTrackPath(item.Path));
diff --git a/src/openrct2/scenario/ScenarioSources.cpp b/src/openrct2/scenario/ScenarioSources.cpp
index 7558b15300..0a53129961 100644
--- a/src/openrct2/scenario/ScenarioSources.cpp
+++ b/src/openrct2/scenario/ScenarioSources.cpp
@@ -286,7 +286,7 @@ namespace ScenarioSources
             }
         }
 
-        outDesc->title = NULL;
+        outDesc->title = nullptr;
         outDesc->id = SC_UNIDENTIFIED;
         outDesc->source = SCENARIO_SOURCE_OTHER;
         outDesc->index = -1;
@@ -317,7 +317,7 @@ namespace ScenarioSources
             }
         }
 
-        outDesc->title = NULL;
+        outDesc->title = nullptr;
         outDesc->id = SC_UNIDENTIFIED;
         outDesc->source = SCENARIO_SOURCE_OTHER;
         outDesc->index = -1;
diff --git a/src/openrct2/windows/Banner.cpp b/src/openrct2/windows/Banner.cpp
index bee49c001d..3f02308ce1 100644
--- a/src/openrct2/windows/Banner.cpp
+++ b/src/openrct2/windows/Banner.cpp
@@ -82,34 +82,34 @@ static void window_banner_invalidate(rct_window *w);
 static void window_banner_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_banner_events = {
-    NULL,
+    nullptr,
     window_banner_mouseup,
-    NULL,
+    nullptr,
     window_banner_mousedown,
     window_banner_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_banner_textinput,
     window_banner_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_banner_invalidate,
     window_banner_paint,
-    NULL
+    nullptr
 };
 
 /**
@@ -124,7 +124,7 @@ static void _window_banner_open(rct_windownumber number)
 
     // Check if window is already open
     w = window_bring_to_front_by_number(WC_BANNER, number);
-    if (w != NULL)
+    if (w != nullptr)
         return;
 
     w = window_create_auto_pos(WW, WH, &window_banner_events, WC_BANNER, WF_NO_SCROLLING);
@@ -284,7 +284,7 @@ static void window_banner_dropdown(rct_window *w, rct_widgetindex widgetIndex, s
  */
 static void window_banner_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex == WIDX_BANNER_TEXT && text != NULL) {
+    if (widgetIndex == WIDX_BANNER_TEXT && text != nullptr) {
         game_do_command(1, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 0)), GAME_COMMAND_SET_BANNER_NAME, *((sint32*)(text + 8)), *((sint32*)(text + 4)));
         game_do_command(2, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 12)), GAME_COMMAND_SET_BANNER_NAME, *((sint32*)(text + 20)), *((sint32*)(text + 16)));
         game_do_command(0, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 24)), GAME_COMMAND_SET_BANNER_NAME, *((sint32*)(text + 32)), *((sint32*)(text + 28)));
@@ -332,7 +332,7 @@ static void window_banner_paint(rct_window *w, rct_drawpixelinfo *dpi)
     window_draw_widgets(w, dpi);
 
     // Draw viewport
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         window_draw_viewport(dpi, w);
     }
 }
diff --git a/src/openrct2/windows/DemolishRidePrompt.cpp b/src/openrct2/windows/DemolishRidePrompt.cpp
index 9755dcb9b9..7a93442ada 100644
--- a/src/openrct2/windows/DemolishRidePrompt.cpp
+++ b/src/openrct2/windows/DemolishRidePrompt.cpp
@@ -46,34 +46,34 @@ static void window_ride_demolish_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 //0x0098E2E4
 static rct_window_event_list window_ride_demolish_events = {
-    NULL,
+    nullptr,
     window_ride_demolish_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_demolish_paint,
-    NULL
+    nullptr
 };
 
 /** Based off of rct2: 0x006B486A */
@@ -82,7 +82,7 @@ static void _window_ride_demolish_prompt_open(sint32 rideIndex)
     rct_window *w;
 
     w = window_bring_to_front_by_number(WC_DEMOLISH_RIDE_PROMPT, rideIndex);
-    if (w != NULL)
+    if (w != nullptr)
         return;
 
     w = window_create_centred(WW, WH, &window_ride_demolish_events, WC_DEMOLISH_RIDE_PROMPT, WF_TRANSPARENT);
@@ -107,7 +107,7 @@ static void window_ride_demolish_mouseup(rct_window *w, rct_widgetindex widgetIn
 
         // Prevents demolished rides sticking around in the ride list window
         window = window_find_by_class(WC_RIDE_LIST);
-        if (window != NULL)
+        if (window != nullptr)
         {
             window_ride_list_refresh_list(window);
         }
diff --git a/src/openrct2/windows/Dropdown.cpp b/src/openrct2/windows/Dropdown.cpp
index 17e8acd091..cdd53ce4f6 100644
--- a/src/openrct2/windows/Dropdown.cpp
+++ b/src/openrct2/windows/Dropdown.cpp
@@ -101,34 +101,34 @@ void dropdown_set_disabled(sint32 index, bool value)
 static void window_dropdown_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_dropdown_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_dropdown_paint,
-    NULL
+    nullptr
 };
 
 /**
diff --git a/src/openrct2/windows/EditorBottomToolbar.cpp b/src/openrct2/windows/EditorBottomToolbar.cpp
index 7b0d86ca91..cd0ef802b0 100644
--- a/src/openrct2/windows/EditorBottomToolbar.cpp
+++ b/src/openrct2/windows/EditorBottomToolbar.cpp
@@ -62,45 +62,45 @@ static void window_editor_bottom_toolbar_jump_forward_to_objective_selection();
 static void window_editor_bottom_toolbar_jump_forward_to_save_scenario();
 
 static rct_window_event_list window_editor_bottom_toolbar_events = {
-    NULL,
+    nullptr,
     window_editor_bottom_toolbar_mouseup, // 0x0066f5ae,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_bottom_toolbar_invalidate, // 0x0066f1c9,
     window_editor_bottom_toolbar_paint, // 0x0066f25c,
-    NULL
+    nullptr
 };
 
 static EMPTY_ARGS_VOID_POINTER *previous_button_mouseup_events[] = {
-    NULL,
+    nullptr,
     window_editor_bottom_toolbar_jump_back_to_object_selection,
     window_editor_bottom_toolbar_jump_back_to_landscape_editor,
     window_editor_bottom_toolbar_jump_back_to_invention_list_set_up,
     window_editor_bottom_toolbar_jump_back_to_options_selection,
-    NULL,
+    nullptr,
     window_editor_bottom_toolbar_jump_back_to_object_selection,
-    NULL
+    nullptr
 };
 
 static EMPTY_ARGS_VOID_POINTER *next_button_mouseup_events[] = {
@@ -109,9 +109,9 @@ static EMPTY_ARGS_VOID_POINTER *next_button_mouseup_events[] = {
     window_editor_bottom_toolbar_jump_forward_to_options_selection,
     window_editor_bottom_toolbar_jump_forward_to_objective_selection,
     window_editor_bottom_toolbar_jump_forward_to_save_scenario,
-    NULL,
-    NULL,
-    NULL
+    nullptr,
+    nullptr,
+    nullptr
 };
 
 static const rct_string_id EditorStepNames[] = {
@@ -208,7 +208,7 @@ static bool window_editor_bottom_toolbar_check_object_selection()
 
     window_error_open(STR_INVALID_SELECTION_OF_OBJECTS, gGameCommandErrorText);
     w = window_find_by_class(WC_EDITOR_OBJECT_SELECTION);
-    if (w != NULL) {
+    if (w != nullptr) {
         // Click tab with missing object
         window_event_mouse_up_call(w, WC_EDITOR_OBJECT_SELECTION__WIDX_TAB_1 + missingObjectType);
     }
@@ -447,8 +447,8 @@ void window_editor_bottom_toolbar_paint(rct_window *w, rct_drawpixelinfo *dpi)
             if (gScreenFlags & SCREEN_FLAGS_TRACK_DESIGNER)
                 stringId = STR_EDITOR_STEP_OBJECT_SELECTION;
 
-            gfx_draw_string_centred(dpi, STR_BACK_TO_PREVIOUS_STEP, textX, textY, textColour, NULL);
-            gfx_draw_string_centred(dpi, stringId, textX, textY + 10, textColour, NULL);
+            gfx_draw_string_centred(dpi, STR_BACK_TO_PREVIOUS_STEP, textX, textY, textColour, nullptr);
+            gfx_draw_string_centred(dpi, stringId, textX, textY + 10, textColour, nullptr);
         }
 
         if ((drawPreviousButton || drawNextButton) && gS6Info.editor_step != EDITOR_STEP_ROLLERCOASTER_DESIGNER) {
@@ -472,8 +472,8 @@ void window_editor_bottom_toolbar_paint(rct_window *w, rct_drawpixelinfo *dpi)
             if (gScreenFlags & SCREEN_FLAGS_TRACK_DESIGNER)
                 stringId = STR_EDITOR_STEP_ROLLERCOASTER_DESIGNER;
 
-            gfx_draw_string_centred(dpi, STR_FORWARD_TO_NEXT_STEP, textX, textY, textColour, NULL);
-            gfx_draw_string_centred(dpi, stringId, textX, textY + 10, textColour, NULL);
+            gfx_draw_string_centred(dpi, STR_FORWARD_TO_NEXT_STEP, textX, textY, textColour, nullptr);
+            gfx_draw_string_centred(dpi, stringId, textX, textY + 10, textColour, nullptr);
 
         }
     }
diff --git a/src/openrct2/windows/EditorMain.cpp b/src/openrct2/windows/EditorMain.cpp
index e5d3ab2cb6..cdcc0eca9e 100644
--- a/src/openrct2/windows/EditorMain.cpp
+++ b/src/openrct2/windows/EditorMain.cpp
@@ -26,34 +26,34 @@ extern "C"
 static void window_editor_main_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_editor_main_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_main_paint,// 0x0066FC97, // window_editor_main_paint,
-    NULL,
+    nullptr,
 };
 
 static rct_widget window_editor_main_widgets[] = {
diff --git a/src/openrct2/windows/EditorObjectSelection.cpp b/src/openrct2/windows/EditorObjectSelection.cpp
index b4cdec3965..6b351479e1 100644
--- a/src/openrct2/windows/EditorObjectSelection.cpp
+++ b/src/openrct2/windows/EditorObjectSelection.cpp
@@ -202,26 +202,26 @@ static rct_window_event_list window_editor_object_selection_events = {
     window_editor_object_selection_resize,
     window_editor_object_selection_mousedown,
     window_editor_object_selection_dropdown,
-    NULL,
+    nullptr,
     window_editor_object_selection_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_editor_object_selection_scrollgetsize,
     window_editor_object_selection_scroll_mousedown,
-    NULL,
+    nullptr,
     window_editor_object_selection_scroll_mouseover,
     window_editor_object_selection_textinput,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_editor_object_selection_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_editor_object_selection_invalidate,
     window_editor_object_selection_paint,
     window_editor_object_selection_scrollpaint
@@ -277,11 +277,11 @@ static rct_string_id get_ride_type_string_id(const ObjectRepositoryItem * item);
 typedef sint32(*sortFunc_t)(const void *, const void *);
 
 static sint32 _numListItems = 0;
-static list_item *_listItems = NULL;
+static list_item *_listItems = nullptr;
 static sint32 _listSortType = RIDE_SORT_TYPE;
 static bool _listSortDescending = false;
-static void * _loadedObject = NULL;
-static uint8 * _objectSelectionFlags = NULL;
+static void * _loadedObject = nullptr;
+static uint8 * _objectSelectionFlags = nullptr;
 static sint32 _numSelectedObjectsForType[11];
 static sint32 _numAvailableObjectsForType[11];
 static bool _maxObjectsWasHit;
@@ -358,11 +358,11 @@ static void visible_list_refresh(rct_window *w)
     }
 
     _listItems = Memory::ReallocateArray(_listItems, _numListItems);
-    if (_listItems == NULL) {
+    if (_listItems == nullptr) {
         _numListItems = 0;
         log_error("Unable to reallocate list items");
     } else {
-        sortFunc_t sortFunc = NULL;
+        sortFunc_t sortFunc = nullptr;
         switch (_listSortType) {
         case RIDE_SORT_TYPE:
             sortFunc = visible_list_sort_ride_type;
@@ -398,7 +398,7 @@ void window_editor_object_selection_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_EDITOR_OBJECT_SELECTION);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     if (!sub_6AB211())
@@ -611,7 +611,7 @@ static sint32 sub_6AB211()
 {
     sint32 numObjects = (sint32)object_repository_get_items_count();
     _objectSelectionFlags = (uint8*)calloc(numObjects, sizeof(uint8));
-    if (_objectSelectionFlags == NULL){
+    if (_objectSelectionFlags == nullptr){
         log_error("Failed to allocate memory for object flag list.");
         return 0;
     }
@@ -720,7 +720,7 @@ static void window_editor_object_selection_close(rct_window *w)
     editor_object_flags_free();
 
     object_delete(_loadedObject);
-    _loadedObject = NULL;
+    _loadedObject = nullptr;
 
     if (gScreenFlags & SCREEN_FLAGS_EDITOR) {
         research_populate_list_random();
@@ -813,7 +813,7 @@ static void window_editor_object_selection_mouseup(rct_window *w, rct_widgetinde
         }
         window_invalidate(w);
 
-        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_TRACK, NULL);
+        window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_TRACK, nullptr);
         break;
     case WIDX_FILTER_STRING_BUTTON:
         //window_text_input_open(w, widgetIndex, STR_OBJECT_SEARCH, STR_OBJECT_SEARCH_DESC, STR_STRING, (uint32)_filter_string, 40);
@@ -1026,11 +1026,11 @@ static void window_editor_object_selection_scroll_mouseover(rct_window *w, sint3
         w->selected_list_item = selectedObject;
 
         object_delete(_loadedObject);
-        _loadedObject = NULL;
+        _loadedObject = nullptr;
 
         list_item * listItem = &_listItems[selectedObject];
         if (selectedObject == -1) {
-            w->object_entry = NULL;
+            w->object_entry = nullptr;
         } else {
             w->object_entry = listItem->entry;
             _loadedObject = object_repository_load_object(listItem->entry);
@@ -1291,7 +1291,7 @@ static void window_editor_object_selection_paint(rct_window *w, rct_drawpixelinf
         gfx_draw_string_left_clipped(dpi, STR_OBJECTS_SORT_RIDE, &stringId, w->colours[1], w->x + widget->left + 1, w->y + widget->top + 1, widget->right - widget->left);
     }
 
-    if (w->selected_list_item == -1 || _loadedObject == NULL)
+    if (w->selected_list_item == -1 || _loadedObject == nullptr)
         return;
 
     list_item *listItem = &_listItems[w->selected_list_item];
@@ -1322,7 +1322,7 @@ static void window_editor_object_selection_paint(rct_window *w, rct_drawpixelinf
 
     // Draw description of object
     const char *description = object_get_description(_loadedObject);
-    if (description != NULL) {
+    if (description != nullptr) {
         set_format_arg(0, rct_string_id, STR_STRING);
         set_format_arg(2, const char *, description);
 
@@ -1344,18 +1344,18 @@ static void window_editor_object_selection_paint(rct_window *w, rct_drawpixelinf
     case 2: stringId = STR_OBJECT_FILTER_TT; break;
     default: stringId = STR_OBJECT_FILTER_CUSTOM; break;
     }
-    gfx_draw_string_right(dpi, stringId, NULL, COLOUR_WHITE, w->x + w->width - 5, w->y + w->height - 3 - 12 - 14);
+    gfx_draw_string_right(dpi, stringId, nullptr, COLOUR_WHITE, w->x + w->width - 5, w->y + w->height - 3 - 12 - 14);
 
     //
     if (w->selected_tab == WINDOW_OBJECT_SELECTION_PAGE_RIDE_VEHICLES_ATTRACTIONS) {
         y = w->y + w->height - 3 - 12 - 14 - 14;
         stringId = get_ride_type_string_id(listItem->repositoryItem);
-        gfx_draw_string_right(dpi, stringId, NULL, COLOUR_WHITE, w->x + w->width - 5, y);
+        gfx_draw_string_right(dpi, stringId, nullptr, COLOUR_WHITE, w->x + w->width - 5, y);
         y -= 11;
     }
 
     //stringId = highlightedEntry->checksum
-    // gfx_draw_string_right(dpi, stringId, NULL, 2, w->x + w->width - 5, w->y + w->height - 3 - 12 - 14);
+    // gfx_draw_string_right(dpi, stringId, nullptr, 2, w->x + w->width - 5, w->y + w->height - 3 - 12 - 14);
 
     // Draw object dat name
     const char *path = path_get_filename(listItem->repositoryItem->Path);
@@ -1535,7 +1535,7 @@ static sint32 window_editor_object_selection_select_object(uint8 bh, sint32 flag
 {
     sint32 numObjects = (sint32)object_repository_get_items_count();
     const ObjectRepositoryItem * item = object_repository_find_object_by_entry(entry);
-    if (item == NULL) {
+    if (item == nullptr) {
         set_object_selection_error(bh, STR_OBJECT_SELECTION_ERR_OBJECT_DATA_NOT_FOUND);
         return 0;
     }
@@ -1673,9 +1673,9 @@ static void editor_load_selected_objects()
             const ObjectRepositoryItem * item = &items[i];
             const rct_object_entry * entry = &item->ObjectEntry;
             void * loadedObject = object_manager_get_loaded_object(entry);
-            if (loadedObject == NULL) {
+            if (loadedObject == nullptr) {
                 loadedObject = object_manager_load_object(entry);
-                if (loadedObject == NULL) {
+                if (loadedObject == nullptr) {
                     log_error("Failed to load entry %.8s", entry->name);
                 }
                 else if (!(gScreenFlags & SCREEN_FLAGS_EDITOR)) {
@@ -1719,7 +1719,7 @@ static void window_editor_object_selection_update(rct_window *w)
 
 static void window_editor_object_selection_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex != WIDX_FILTER_STRING_BUTTON || text == NULL)
+    if (widgetIndex != WIDX_FILTER_STRING_BUTTON || text == nullptr)
         return;
 
     if (strcmp(_filter_string, text) == 0)
@@ -1765,7 +1765,7 @@ static bool filter_string(const ObjectRepositoryItem * item)
 
     // Object doesn't have a name
     utf8 *name = item->Name;
-    if (name == NULL || name[0] == '\0')
+    if (name == nullptr || name[0] == '\0')
         return false;
 
     // Get ride type
@@ -1787,7 +1787,7 @@ static bool filter_string(const ObjectRepositoryItem * item)
     for (sint32 i = 0; filter_lower[i] != '\0'; i++)
         filter_lower[i] = (char)tolower(filter_lower[i]);
 
-    return strstr(name_lower, filter_lower) != NULL || (((item->ObjectEntry.flags & 0x0F) == OBJECT_TYPE_RIDE) && strstr(type_lower, filter_lower) != NULL);
+    return strstr(name_lower, filter_lower) != nullptr || (((item->ObjectEntry.flags & 0x0F) == OBJECT_TYPE_RIDE) && strstr(type_lower, filter_lower) != nullptr);
 }
 
 static bool filter_source(const ObjectRepositoryItem * item)
diff --git a/src/openrct2/windows/Error.cpp b/src/openrct2/windows/Error.cpp
index fe5025bbf8..04f1b83c25 100644
--- a/src/openrct2/windows/Error.cpp
+++ b/src/openrct2/windows/Error.cpp
@@ -41,34 +41,34 @@ static void window_error_unknown5(rct_window *w);
 static void window_error_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_error_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_error_unknown5,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_error_paint,
-    NULL
+    nullptr
 };
 
 static char _window_error_text[512];
diff --git a/src/openrct2/windows/Finances.cpp b/src/openrct2/windows/Finances.cpp
index 30474cd9a1..6238d4cc48 100644
--- a/src/openrct2/windows/Finances.cpp
+++ b/src/openrct2/windows/Finances.cpp
@@ -231,194 +231,194 @@ static void window_finances_research_paint(rct_window *w, rct_drawpixelinfo *dpi
 
 // 0x00988EB8
 static rct_window_event_list window_finances_summary_events = {
-    NULL,
+    nullptr,
     window_finances_summary_mouseup,
-    NULL,
+    nullptr,
     window_finances_summary_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_finances_summary_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_summary_invalidate,
     window_finances_summary_paint,
-    NULL
+    nullptr
 };
 
 // 0x00988F28
 static rct_window_event_list window_finances_financial_graph_events = {
-    NULL,
+    nullptr,
     window_finances_financial_graph_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_financial_graph_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_financial_graph_invalidate,
     window_finances_financial_graph_paint,
-    NULL
+    nullptr
 };
 
 // 0x00988F98
 static rct_window_event_list window_finances_value_graph_events = {
-    NULL,
+    nullptr,
     window_finances_park_value_graph_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_park_value_graph_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_park_value_graph_invalidate,
     window_finances_park_value_graph_paint,
-    NULL
+    nullptr
 };
 
 // 0x00989008
 static rct_window_event_list window_finances_profit_graph_events = {
-    NULL,
+    nullptr,
     window_finances_profit_graph_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_profit_graph_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_profit_graph_invalidate,
     window_finances_profit_graph_paint,
-    NULL
+    nullptr
 };
 
 // 0x00989078
 static rct_window_event_list window_finances_marketing_events = {
-    NULL,
+    nullptr,
     window_finances_marketing_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_marketing_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_marketing_invalidate,
     window_finances_marketing_paint,
-    NULL
+    nullptr
 };
 
 // 0x009890E8
 static rct_window_event_list window_finances_research_events = {
-    NULL,
+    nullptr,
     window_finances_research_mouseup,
-    NULL,
+    nullptr,
     window_finances_research_mousedown,
     window_finances_research_dropdown,
-    NULL,
+    nullptr,
     window_finances_research_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_finances_research_invalidate,
     window_finances_research_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_finances_page_events[] = {
@@ -549,7 +549,7 @@ void window_finances_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_FINANCES);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_create_auto_pos(530, 257, window_finances_page_events[0], WC_FINANCES, WF_10);
         w->number = 0;
         w->frame_no = 0;
@@ -582,7 +582,7 @@ void window_finances_research_open()
 
     window_finances_open();
     w = window_find_by_class(WC_FINANCES);
-    if (w != NULL)
+    if (w != nullptr)
         window_finances_set_page(w, WINDOW_FINANCES_PAGE_RESEARCH);
 }
 
@@ -666,7 +666,7 @@ static void window_finances_summary_paint(rct_window *w, rct_drawpixelinfo *dpi)
     y = w->y + 47;
 
     // Expenditure / Income heading
-    draw_string_left_underline(dpi, STR_FINANCES_SUMMARY_EXPENDITURE_INCOME, NULL, COLOUR_BLACK, x, y - 1);
+    draw_string_left_underline(dpi, STR_FINANCES_SUMMARY_EXPENDITURE_INCOME, nullptr, COLOUR_BLACK, x, y - 1);
     y += 14;
 
     // Expenditure / Income row labels
@@ -675,7 +675,7 @@ static void window_finances_summary_paint(rct_window *w, rct_drawpixelinfo *dpi)
         if (i % 2 == 0)
             gfx_fill_rect(dpi, x, y, x + 513 - 2, y + 9, ColourMapA[w->colours[1]].lighter | 0x1000000);
 
-        gfx_draw_string_left(dpi, window_finances_summary_row_labels[i], NULL, COLOUR_BLACK, x, y - 1);
+        gfx_draw_string_left(dpi, window_finances_summary_row_labels[i], nullptr, COLOUR_BLACK, x, y - 1);
         y += 10;
     }
 
@@ -741,7 +741,7 @@ static void window_finances_summary_paint(rct_window *w, rct_drawpixelinfo *dpi)
     gfx_fill_rect_inset(dpi, w->x + 8, w->y + 223, w->x + 8 + 513, w->y + 223 + 1, w->colours[1], INSET_RECT_FLAG_BORDER_INSET);
 
     // Loan and interest rate
-    gfx_draw_string_left(dpi, STR_FINANCES_SUMMARY_LOAN, NULL, COLOUR_BLACK, w->x + 4, w->y + 229);
+    gfx_draw_string_left(dpi, STR_FINANCES_SUMMARY_LOAN, nullptr, COLOUR_BLACK, w->x + 4, w->y + 229);
     set_format_arg(0, uint16, gBankLoanInterestRate);
     gfx_draw_string_left(dpi, STR_FINANCES_SUMMARY_AT_X_PER_YEAR, gCommonFormatArgs, COLOUR_BLACK, w->x + 156, w->y + 229);
 
@@ -1203,7 +1203,7 @@ static void window_finances_marketing_paint(rct_window *w, rct_drawpixelinfo *dp
     }
 
     if (noCampaignsActive) {
-        gfx_draw_string_left(dpi, STR_MARKETING_CAMPAGINS_NONE, NULL, COLOUR_BLACK, x + 4, y);
+        gfx_draw_string_left(dpi, STR_MARKETING_CAMPAGINS_NONE, nullptr, COLOUR_BLACK, x + 4, y);
         y += 10;
     }
     y += 31;
@@ -1218,7 +1218,7 @@ static void window_finances_marketing_paint(rct_window *w, rct_drawpixelinfo *dp
         money32 pricePerWeek = AdvertisingCampaignPricePerWeek[i];
 
         // Draw button text
-        gfx_draw_string_left(dpi, MarketingCampaignNames[i][0], NULL, COLOUR_BLACK, x + 4, y - 1);
+        gfx_draw_string_left(dpi, MarketingCampaignNames[i][0], nullptr, COLOUR_BLACK, x + 4, y - 1);
         gfx_draw_string_left(dpi, STR_MARKETING_PER_WEEK, &pricePerWeek, COLOUR_BLACK, x + 310, y - 1);
 
         y += 12;
@@ -1388,9 +1388,9 @@ static void window_finances_set_page(rct_window *w, sint32 page)
 {
     w->page = page;
     w->frame_no = 0;
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
     }
 
     w->enabled_widgets = window_finances_page_enabled_widgets[page];
diff --git a/src/openrct2/windows/GameBottomToolbar.cpp b/src/openrct2/windows/GameBottomToolbar.cpp
index e4f13a2058..70ee1d12c3 100644
--- a/src/openrct2/windows/GameBottomToolbar.cpp
+++ b/src/openrct2/windows/GameBottomToolbar.cpp
@@ -90,34 +90,34 @@ static void window_game_bottom_toolbar_draw_news_item(rct_drawpixelinfo *dpi, rc
  *  rct2: 0x0097BFDC
  */
 static rct_window_event_list window_game_bottom_toolbar_events = {
-    NULL,
+    nullptr,
     window_game_bottom_toolbar_mouseup,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_game_bottom_toolbar_unknown05,
     window_game_bottom_toolbar_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_game_bottom_toolbar_tooltip,
     window_game_bottom_toolbar_cursor,
-    NULL,
+    nullptr,
     window_game_bottom_toolbar_invalidate,
     window_game_bottom_toolbar_paint,
-    NULL
+    nullptr
 };
 
 static void window_game_bottom_toolbar_invalidate_dirty_widgets(rct_window *w);
@@ -200,7 +200,7 @@ static void window_game_bottom_toolbar_mouseup(rct_window *w, rct_widgetindex wi
                 break;
 
             rct_window *mainWindow = window_get_main();
-            if (mainWindow != NULL)
+            if (mainWindow != nullptr)
                 window_scroll_to_location(mainWindow, x, y, z);
         }
         break;
diff --git a/src/openrct2/windows/Guest.cpp b/src/openrct2/windows/Guest.cpp
index 8981ab0c7d..593b6f9eba 100644
--- a/src/openrct2/windows/Guest.cpp
+++ b/src/openrct2/windows/Guest.cpp
@@ -221,186 +221,186 @@ static rct_window_event_list window_guest_overview_events = {
     window_guest_overview_close,
     window_guest_overview_mouse_up,
     window_guest_overview_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_overview_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_overview_tool_update,
     window_guest_overview_tool_down,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_overview_tool_abort,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_overview_text_input,
     window_guest_overview_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_overview_invalidate,
     window_guest_overview_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_guest_stats_events = {
-    NULL,
+    nullptr,
     window_guest_mouse_up,
     window_guest_stats_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_unknown_05,
     window_guest_stats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_stats_invalidate,
     window_guest_stats_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_guest_rides_events = {
-    NULL,
+    nullptr,
     window_guest_mouse_up,
     window_guest_rides_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_unknown_05,
     window_guest_rides_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_rides_scroll_get_size,
     window_guest_rides_scroll_mouse_down,
-    NULL,
+    nullptr,
     window_guest_rides_scroll_mouse_over,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_rides_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_rides_invalidate,
     window_guest_rides_paint,
     window_guest_rides_scroll_paint
 };
 
 static rct_window_event_list window_guest_finance_events = {
-    NULL,
+    nullptr,
     window_guest_mouse_up,
     window_guest_finance_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_unknown_05,
     window_guest_finance_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_finance_invalidate,
     window_guest_finance_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_guest_thoughts_events = {
-    NULL,
+    nullptr,
     window_guest_mouse_up,
     window_guest_thoughts_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_unknown_05,
     window_guest_thoughts_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_thoughts_invalidate,
     window_guest_thoughts_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_guest_inventory_events = {
-    NULL,
+    nullptr,
     window_guest_mouse_up,
     window_guest_inventory_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_unknown_05,
     window_guest_inventory_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_inventory_invalidate,
     window_guest_inventory_paint,
-    NULL
+    nullptr
 };
 
 // 0x981D24
@@ -486,7 +486,7 @@ void window_guest_open(rct_peep* peep){
     rct_window* window;
 
     window = window_bring_to_front_by_number(WC_PEEP, peep->sprite_index);
-    if (window == NULL){
+    if (window == nullptr){
         window = window_create_auto_pos(192, 157, &window_guest_overview_events, WC_PEEP, WF_RESIZABLE);
         window->widgets = window_guest_overview_widgets;
         window->enabled_widgets = window_guest_page_enabled_widgets[0];
@@ -1146,7 +1146,7 @@ void window_guest_overview_text_input(rct_window *w, rct_widgetindex widgetIndex
     if (widgetIndex != WIDX_RENAME)
         return;
 
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     gGameCommandErrorTitle = STR_CANT_NAME_GUEST;
@@ -1169,7 +1169,7 @@ void window_guest_overview_tool_update(rct_window* w, rct_widgetindex widgetInde
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE;
 
     sint32 map_x, map_y;
-    footpath_get_coordinates_from_pos(x, y + 16, &map_x, &map_y, NULL, NULL);
+    footpath_get_coordinates_from_pos(x, y + 16, &map_x, &map_y, nullptr, nullptr);
     if (map_x != MAP_LOCATION_NULL) {
         gMapSelectFlags |= MAP_SELECT_FLAG_ENABLE;
         gMapSelectType = MAP_SELECT_TYPE_FULL;
@@ -1183,7 +1183,7 @@ void window_guest_overview_tool_update(rct_window* w, rct_widgetindex widgetInde
     gPickupPeepImage = UINT32_MAX;
 
     sint32 interactionType;
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_NONE, NULL, NULL, &interactionType, NULL, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_NONE, nullptr, nullptr, &interactionType, nullptr, nullptr);
     if (interactionType == VIEWPORT_INTERACTION_ITEM_NONE)
         return;
 
@@ -1217,7 +1217,7 @@ void window_guest_overview_tool_down(rct_window* w, rct_widgetindex widgetIndex,
 
     sint32 dest_x, dest_y;
     rct_map_element* mapElement;
-    footpath_get_coordinates_from_pos(x, y + 16, &dest_x, &dest_y, NULL, &mapElement);
+    footpath_get_coordinates_from_pos(x, y + 16, &dest_x, &dest_y, nullptr, &mapElement);
 
     if (dest_x == MAP_LOCATION_NULL)
         return;
@@ -1479,7 +1479,7 @@ void window_guest_stats_paint(rct_window *w, rct_drawpixelinfo *dpi)
     gfx_fill_rect_inset(dpi, x, y - 6, x + 179, y - 5, w->colours[1], INSET_RECT_FLAG_BORDER_INSET);
 
     // Preferred Ride
-    gfx_draw_string_left(dpi, STR_GUEST_STAT_PREFERRED_RIDE, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_STAT_PREFERRED_RIDE, nullptr, COLOUR_BLACK, x, y);
     y += 10;
 
     // Intensity
@@ -1675,7 +1675,7 @@ void window_guest_rides_paint(rct_window *w, rct_drawpixelinfo *dpi)
     // dx
     sint32 y = w->y + window_guest_rides_widgets[WIDX_PAGE_BACKGROUND].top + 2;
 
-    gfx_draw_string_left(dpi, STR_GUEST_LABEL_RIDES_BEEN_ON, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_LABEL_RIDES_BEEN_ON, nullptr, COLOUR_BLACK, x, y);
 
     y = w->y + window_guest_rides_widgets[WIDX_PAGE_BACKGROUND].bottom - 12;
 
@@ -1938,7 +1938,7 @@ void window_guest_thoughts_paint(rct_window *w, rct_drawpixelinfo *dpi)
     // dx
     sint32 y = w->y + window_guest_thoughts_widgets[WIDX_PAGE_BACKGROUND].top + 4;
 
-    gfx_draw_string_left(dpi, STR_GUEST_RECENT_THOUGHTS_LABEL, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_GUEST_RECENT_THOUGHTS_LABEL, nullptr, COLOUR_BLACK, x, y);
 
     y += 10;
     for (rct_peep_thought* thought = peep->thoughts; thought < &peep->thoughts[PEEP_MAX_THOUGHTS]; ++thought){
@@ -2114,7 +2114,7 @@ void window_guest_inventory_paint(rct_window *w, rct_drawpixelinfo *dpi)
     sint32 maxY = w->y + w->height - 22;
     sint32 numItems = 0;
 
-    gfx_draw_string_left(dpi, STR_CARRYING, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_CARRYING, nullptr, COLOUR_BLACK, x, y);
     y += 10;
 
     for (sint32 item = 0; item < SHOP_ITEM_COUNT; item++) {
@@ -2127,6 +2127,6 @@ void window_guest_inventory_paint(rct_window *w, rct_drawpixelinfo *dpi)
     }
 
     if (numItems == 0) {
-        gfx_draw_string_left(dpi, STR_NOTHING, NULL, COLOUR_BLACK, x, y);
+        gfx_draw_string_left(dpi, STR_NOTHING, nullptr, COLOUR_BLACK, x, y);
     }
 }
diff --git a/src/openrct2/windows/GuestList.cpp b/src/openrct2/windows/GuestList.cpp
index 85433a0cfb..3111073d54 100644
--- a/src/openrct2/windows/GuestList.cpp
+++ b/src/openrct2/windows/GuestList.cpp
@@ -102,31 +102,31 @@ static void window_guest_list_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_guest_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list window_guest_list_events = {
-    NULL,
+    nullptr,
     window_guest_list_mouseup,
     window_guest_list_resize,
     window_guest_list_mousedown,
     window_guest_list_dropdown,
-    NULL,
+    nullptr,
     window_guest_list_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_list_scrollgetsize,
     window_guest_list_scrollmousedown,
-    NULL,
+    nullptr,
     window_guest_list_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_guest_list_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_guest_list_invalidate,
     window_guest_list_paint,
     window_guest_list_scrollpaint
@@ -191,7 +191,7 @@ void window_guest_list_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_GUEST_LIST);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     window = window_create_auto_pos(350, 330, &window_guest_list_events, WC_GUEST_LIST, WF_10 | WF_RESIZABLE);
diff --git a/src/openrct2/windows/InstallTrack.cpp b/src/openrct2/windows/InstallTrack.cpp
index 89c6b87017..084fbadcc8 100644
--- a/src/openrct2/windows/InstallTrack.cpp
+++ b/src/openrct2/windows/InstallTrack.cpp
@@ -63,32 +63,32 @@ static void window_install_track_text_input(rct_window *w, rct_widgetindex widge
 static rct_window_event_list window_install_track_events = {
     window_install_track_close,
     window_install_track_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_install_track_text_input,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_install_track_invalidate,
     window_install_track_paint,
-    NULL
+    nullptr
 };
 
 static rct_track_td6 *_trackDesign;
@@ -106,7 +106,7 @@ static void window_install_track_design(rct_window *w);
 void window_install_track_open(const utf8 *path)
 {
     _trackDesign = track_design_open(path);
-    if (_trackDesign == NULL) {
+    if (_trackDesign == nullptr) {
         window_error_open(STR_UNABLE_TO_LOAD_FILE, STR_NONE);
         return;
     }
@@ -116,7 +116,7 @@ void window_install_track_open(const utf8 *path)
         log_error("Failed to load track (ride type null): %s", path);
         return;
     }
-    if (object_manager_load_object(&_trackDesign->vehicle_object) == NULL) {
+    if (object_manager_load_object(&_trackDesign->vehicle_object) == nullptr) {
         log_error("Failed to load track (vehicle load fail): %s", path);
         return;
     }
@@ -157,7 +157,7 @@ static void window_install_track_close(rct_window *w)
     SafeFree(_trackName);
     SafeFree(_trackDesignPreviewPixels);
     track_design_dispose(_trackDesign);
-    _trackDesign = NULL;
+    _trackDesign = nullptr;
 }
 
 /**
@@ -242,7 +242,7 @@ static void window_install_track_paint(rct_window *w, rct_drawpixelinfo *dpi)
     if (td6->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE) {
         if (!gTrackDesignSceneryToggle) {
             // Scenery not available
-            gfx_draw_string_centred_clipped(dpi, STR_DESIGN_INCLUDES_SCENERY_WHICH_IS_UNAVAILABLE, NULL, COLOUR_BLACK, x, y, 368);
+            gfx_draw_string_centred_clipped(dpi, STR_DESIGN_INCLUDES_SCENERY_WHICH_IS_UNAVAILABLE, nullptr, COLOUR_BLACK, x, y, 368);
             y -= 10;
         }
     }
diff --git a/src/openrct2/windows/LoadSave.cpp b/src/openrct2/windows/LoadSave.cpp
index 44df6a791b..e535974809 100644
--- a/src/openrct2/windows/LoadSave.cpp
+++ b/src/openrct2/windows/LoadSave.cpp
@@ -83,30 +83,30 @@ static void window_loadsave_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, s
 static rct_window_event_list window_loadsave_events = {
     window_loadsave_close,
     window_loadsave_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_loadsave_scrollgetsize,
     window_loadsave_scrollmousedown,
-    NULL,
+    nullptr,
     window_loadsave_scrollmouseover,
     window_loadsave_textinput,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_loadsave_tooltip,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_loadsave_paint,
     window_loadsave_scrollpaint
 };
@@ -129,7 +129,7 @@ typedef struct loadsave_list_item {
 static loadsave_callback _loadSaveCallback;
 
 static sint32 _listItemsCount = 0;
-static loadsave_list_item *_listItems = NULL;
+static loadsave_list_item *_listItems = nullptr;
 static char _directory[MAX_PATH];
 static char _shortenedDirectory[MAX_PATH];
 static char _parentDirectory[MAX_PATH];
@@ -164,7 +164,7 @@ static sint32 window_loadsave_get_dir(utf8 *last_save, char *path, const char *s
 
 rct_window *window_loadsave_open(sint32 type, char *defaultName)
 {
-    _loadSaveCallback = NULL;
+    _loadSaveCallback = nullptr;
     _type = type;
     _defaultName[0] = '\0';
 
@@ -173,7 +173,7 @@ rct_window *window_loadsave_open(sint32 type, char *defaultName)
     }
 
     rct_window *w = window_bring_to_front_by_class(WC_LOADSAVE);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_create_centred(WW, WH, &window_loadsave_events, WC_LOADSAVE, WF_STICK_TO_FRONT);
         w->widgets = window_loadsave_widgets;
         w->enabled_widgets = (1 << WIDX_CLOSE) | (1 << WIDX_UP) | (1 << WIDX_NEW_FOLDER) | (1 << WIDX_NEW_FILE) | (1 << WIDX_SORT_NAME) | (1 << WIDX_SORT_DATE) | (1 << WIDX_BROWSE) | (1 << WIDX_DEFAULT);
@@ -232,7 +232,7 @@ rct_window *window_loadsave_open(sint32 type, char *defaultName)
 
     if (!success) {
         window_close(w);
-        return NULL;
+        return nullptr;
     }
 
     w->no_list_items = _listItemsCount;
@@ -242,9 +242,9 @@ rct_window *window_loadsave_open(sint32 type, char *defaultName)
 
 static void window_loadsave_close(rct_window *w)
 {
-    if (_listItems != NULL) {
+    if (_listItems != nullptr) {
         free(_listItems);
-        _listItems = NULL;
+        _listItems = nullptr;
     }
 
     window_close_by_class(WC_LOADSAVE_OVERWRITE_PROMPT);
@@ -259,7 +259,7 @@ static bool browse(bool isSave, char *path, size_t pathSize)
     file_dialog_desc desc = { 0 };
     desc.initial_directory = _directory;
     desc.type = isSave ? FD_SAVE : FD_OPEN;
-    desc.default_filename = isSave ? path : NULL;
+    desc.default_filename = isSave ? path : nullptr;
 
     rct_string_id title = STR_NONE;
     switch (_type & 0x0E) {
@@ -317,7 +317,7 @@ static void window_loadsave_mouseup(rct_window *w, rct_widgetindex widgetIndex)
         window_text_input_open(w, WIDX_NEW_FILE, STR_NONE, STR_FILEBROWSER_FILE_NAME_PROMPT, STR_STRING, (uintptr_t)&_defaultName, 64);
         break;
     case WIDX_NEW_FOLDER:
-        window_text_input_raw_open(w, WIDX_NEW_FOLDER, STR_NONE, STR_FILEBROWSER_FOLDER_NAME_PROMPT, NULL, 64);
+        window_text_input_raw_open(w, WIDX_NEW_FOLDER, STR_NONE, STR_FILEBROWSER_FOLDER_NAME_PROMPT, nullptr, 64);
         break;
     case WIDX_BROWSE:
         if (browse(isSave, path, sizeof(path)))
@@ -421,7 +421,7 @@ static void window_loadsave_textinput(rct_window *w, rct_widgetindex widgetIndex
     char path[MAX_PATH];
     sint32 i, overwrite;
 
-    if (text == NULL || text[0] == 0)
+    if (text == nullptr || text[0] == 0)
         return;
 
     switch (widgetIndex) {
@@ -581,7 +581,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
     }
     _shortenedDirectory[0] = '\0';
 
-    if (_listItems != NULL)
+    if (_listItems != nullptr)
         free(_listItems);
 
     sint32 listItemCapacity = 8;
@@ -600,7 +600,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
             if (listItemCapacity <= _listItemsCount) {
                 listItemCapacity *= 2;
                 void *new_memory = realloc(_listItems, listItemCapacity * sizeof(loadsave_list_item));
-                if (new_memory == NULL) {
+                if (new_memory == nullptr) {
                     log_error("Failed to reallocate memory for loadsave list");
                     return;
                 }
@@ -628,7 +628,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
 
         // Remove everything past the now last separator
         char *ch = strrchr(_parentDirectory, *PATH_SEPARATOR);
-        if (ch != NULL) {
+        if (ch != nullptr) {
             *(ch + 1) = '\0';
         } else if (drives) {
             // If on Windows, clear the entire path to show the drives
@@ -675,7 +675,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
         char * extToken;
         bool showExtension = false;
         extToken = strtok(extCopy, ";");
-        while (extToken != NULL) {
+        while (extToken != nullptr) {
             safe_strcpy(filter, directory, sizeof(filter));
             safe_strcat_path(filter, "*", sizeof(filter));
             path_append_extension(filter, extToken, sizeof(filter));
@@ -706,7 +706,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
             }
             platform_enumerate_files_end(fileEnumHandle);
 
-            extToken = strtok(NULL, ";");
+            extToken = strtok(nullptr, ";");
             showExtension = true; //Show any extension after the first iteration
         }
 
@@ -716,7 +716,7 @@ static void window_loadsave_populate_list(rct_window *w, sint32 includeNewItem,
 
 static void window_loadsave_invoke_callback(sint32 result, const utf8 * path)
 {
-    if (_loadSaveCallback != NULL) {
+    if (_loadSaveCallback != nullptr) {
         _loadSaveCallback(result, path);
     }
 }
@@ -872,34 +872,34 @@ static void window_overwrite_prompt_mouseup(rct_window *w, rct_widgetindex widge
 static void window_overwrite_prompt_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_overwrite_prompt_events = {
-    NULL,
+    nullptr,
     window_overwrite_prompt_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_overwrite_prompt_paint,
-    NULL
+    nullptr
 };
 
 static char _window_overwrite_prompt_name[256];
@@ -931,7 +931,7 @@ static void window_overwrite_prompt_mouseup(rct_window *w, rct_widgetindex widge
     switch (widgetIndex) {
     case WIDX_OVERWRITE_OVERWRITE:
         loadsaveWindow = window_find_by_class(WC_LOADSAVE);
-        if (loadsaveWindow != NULL)
+        if (loadsaveWindow != nullptr)
             window_loadsave_select(loadsaveWindow, _window_overwrite_prompt_path);
         // As the window_loadsave_select function can change the order of the
         // windows we can't use window_close(w).
diff --git a/src/openrct2/windows/Map.cpp b/src/openrct2/windows/Map.cpp
index f4cc23a52f..3386af1af0 100644
--- a/src/openrct2/windows/Map.cpp
+++ b/src/openrct2/windows/Map.cpp
@@ -144,27 +144,27 @@ static rct_window_event_list window_map_events = {
     window_map_mouseup,
     window_map_resize,
     window_map_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_map_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_map_toolupdate,
     window_map_tooldown,
     window_map_tooldrag,
-    NULL,
+    nullptr,
     window_map_toolabort,
-    NULL,
+    nullptr,
     window_map_scrollgetsize,
     window_map_scrollmousedown,
     window_map_scrollmousedown,
-    NULL,
+    nullptr,
     window_map_textinput,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_map_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_map_invalidate,
     window_map_paint,
     window_map_scrollpaint
@@ -213,14 +213,14 @@ void window_map_open()
 
     // Check if window is already open
     w = window_bring_to_front_by_class(WC_MAP);
-    if (w != NULL) {
+    if (w != nullptr) {
         w->selected_tab = 0;
         w->list_information_type = 0;
         return;
     }
 
     _mapImageData = Memory::Allocate<uint8[MAP_WINDOW_MAP_SIZE][MAP_WINDOW_MAP_SIZE]>();
-    if (_mapImageData == NULL) {
+    if (_mapImageData == nullptr) {
         return;
     }
 
@@ -270,7 +270,7 @@ void window_map_reset()
 
     // Check if window is even opened
     w = window_bring_to_front_by_class(WC_MAP);
-    if (w == NULL) {
+    if (w == nullptr) {
         return;
     }
 
@@ -578,7 +578,7 @@ static void window_map_scrollmousedown(rct_window *w, sint32 scrollIndex, sint32
     mapZ = map_element_height(x, y);
 
     mainWindow = window_get_main();
-    if (mainWindow != NULL) {
+    if (mainWindow != nullptr) {
         window_scroll_to_location(mainWindow, mapX, mapY, mapZ);
     }
 
@@ -644,7 +644,7 @@ static void window_map_textinput(rct_window *w, rct_widgetindex widgetIndex, cha
     sint32 size;
     char* end;
 
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     switch (widgetIndex) {
@@ -871,7 +871,7 @@ static void window_map_paint(rct_window *w, rct_drawpixelinfo *dpi)
             }
         }
     } else if (!widget_is_active_tool(w, WIDX_SET_LAND_RIGHTS)) {
-        gfx_draw_string_left(dpi, STR_MAP_SIZE, NULL, w->colours[1], w->x + 4, w->y + w->widgets[WIDX_MAP_SIZE_SPINNER].top + 1);
+        gfx_draw_string_left(dpi, STR_MAP_SIZE, nullptr, w->colours[1], w->x + 4, w->y + w->widgets[WIDX_MAP_SIZE_SPINNER].top + 1);
     }
 }
 
@@ -928,11 +928,11 @@ static void window_map_centre_on_view_point()
     sint16 ax, bx, cx, dx;
     sint16 bp, di;
 
-    if (w == NULL || w->viewport == NULL)
+    if (w == nullptr || w->viewport == nullptr)
         return;
 
     w_map = window_find_by_class(WC_MAP);
-    if (w_map == NULL)
+    if (w_map == nullptr)
         return;
 
     rct_xy16 offset = MiniMapOffsets[get_current_rotation()];
@@ -1145,11 +1145,11 @@ static void window_map_paint_train_overlay(rct_drawpixelinfo *dpi)
 static void window_map_paint_hud_rectangle(rct_drawpixelinfo *dpi)
 {
     rct_window *main_window = window_get_main();
-    if (main_window == NULL)
+    if (main_window == nullptr)
         return;
 
     rct_viewport *viewport = main_window->viewport;
-    if (viewport == NULL)
+    if (viewport == nullptr)
         return;
 
     rct_xy16 offset = MiniMapOffsets[get_current_rotation()];
@@ -1363,7 +1363,7 @@ static void window_map_set_peep_spawn_tool_down(sint32 x, sint32 y)
         return;
 
     surfaceMapElement = map_get_surface_element_at(mapX >> 5, mapY >> 5);
-    if (surfaceMapElement == NULL) {
+    if (surfaceMapElement == nullptr) {
         return;
     }
     if (surfaceMapElement->properties.surface.ownership & 0xF0) {
diff --git a/src/openrct2/windows/MapTooltip.cpp b/src/openrct2/windows/MapTooltip.cpp
index 4c1d7dbcb9..cc9768c1ea 100644
--- a/src/openrct2/windows/MapTooltip.cpp
+++ b/src/openrct2/windows/MapTooltip.cpp
@@ -32,34 +32,34 @@ static void window_map_tooltip_update(rct_window *w);
 static void window_map_tooltip_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_map_tooltip_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_map_tooltip_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_map_tooltip_paint,
-    NULL
+    nullptr
 };
 
 #define MAP_TOOLTIP_ARGS
@@ -97,7 +97,7 @@ void window_map_tooltip_update_visibility()
     if (_cursorHoldDuration < 25 ||
         stringId == STR_NONE ||
         input_test_place_object_modifier((PLACE_OBJECT_MODIFIER) (PLACE_OBJECT_MODIFIER_COPY_Z | PLACE_OBJECT_MODIFIER_SHIFT_Z)) ||
-        window_find_by_class(WC_ERROR) != NULL
+        window_find_by_class(WC_ERROR) != nullptr
     ) {
         window_close_by_class(WC_MAP_TOOLTIP);
     } else {
@@ -121,7 +121,7 @@ static void window_map_tooltip_open()
     y = state->y + 15;
 
     w = window_find_by_class(WC_MAP_TOOLTIP);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_create(
             x, y, width, height, &window_map_tooltip_events, WC_MAP_TOOLTIP, WF_STICK_TO_FRONT | WF_TRANSPARENT | WF_NO_BACKGROUND
         );
diff --git a/src/openrct2/windows/MazeConstruction.cpp b/src/openrct2/windows/MazeConstruction.cpp
index e4e4f65e4f..ce16980d48 100644
--- a/src/openrct2/windows/MazeConstruction.cpp
+++ b/src/openrct2/windows/MazeConstruction.cpp
@@ -104,30 +104,30 @@ static rct_window_event_list window_maze_construction_events = {
     window_maze_construction_mouseup,
     window_maze_construction_resize,
     window_maze_construction_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_maze_construction_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_maze_construction_toolupdate,
     window_maze_construction_tooldown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_maze_construction_invalidate,
     window_maze_construction_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -297,7 +297,7 @@ static void window_maze_construction_mousedown(rct_window *w, rct_widgetindex wi
 static void window_maze_construction_update(rct_window *w)
 {
     rct_ride *ride = get_ride(_currentRideIndex);
-    if (ride == NULL || ride->status != RIDE_STATUS_CLOSED) {
+    if (ride == nullptr || ride->status != RIDE_STATUS_CLOSED) {
         window_close(w);
         return;
     }
@@ -454,7 +454,7 @@ void window_maze_construction_update_pressed_widgets()
     rct_window *w;
 
     w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL)
+    if (w == nullptr)
         return;
 
     uint64 pressedWidgets = w->pressed_widgets;
diff --git a/src/openrct2/windows/NetworkStatus.cpp b/src/openrct2/windows/NetworkStatus.cpp
index 973c8b5058..f33332c5a9 100644
--- a/src/openrct2/windows/NetworkStatus.cpp
+++ b/src/openrct2/windows/NetworkStatus.cpp
@@ -51,35 +51,35 @@ static void window_network_status_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static rct_window_event_list window_network_status_events = {
     window_network_status_onclose,
     window_network_status_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_network_status_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_network_status_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_network_status_invalidate,
     window_network_status_paint,
-    NULL
+    nullptr
 };
 
-static close_callback _onClose = NULL;
+static close_callback _onClose = nullptr;
 
 void window_network_status_open(const char* text, close_callback onClose)
 {
@@ -88,7 +88,7 @@ void window_network_status_open(const char* text, close_callback onClose)
 
     // Check if window is already open
     rct_window *window = window_bring_to_front_by_class_with_flags(WC_NETWORK_STATUS, 0);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     window = window_create_centred(420, 90, &window_network_status_events, WC_NETWORK_STATUS, WF_10 | WF_TRANSPARENT);
@@ -110,7 +110,7 @@ void window_network_status_open(const char* text, close_callback onClose)
 
 void window_network_status_close()
 {
-    _onClose = NULL;
+    _onClose = nullptr;
     window_close_by_class(WC_NETWORK_STATUS);
 }
 
@@ -118,7 +118,7 @@ void window_network_status_open_password()
 {
     rct_window* window;
     window = window_bring_to_front_by_class(WC_NETWORK_STATUS);
-    if (window == NULL)
+    if (window == nullptr)
         return;
 
     window_text_input_raw_open(window, WIDX_PASSWORD, STR_PASSWORD_REQUIRED, STR_PASSWORD_REQUIRED_DESC, _password, 32);
@@ -126,7 +126,7 @@ void window_network_status_open_password()
 
 static void window_network_status_onclose(rct_window *w)
 {
-    if (_onClose != NULL) {
+    if (_onClose != nullptr) {
         _onClose();
     }
 }
@@ -150,11 +150,11 @@ static void window_network_status_textinput(rct_window *w, rct_widgetindex widge
     _password[0] = '\0';
     switch (widgetIndex) {
     case WIDX_PASSWORD:
-        if (text != NULL)
+        if (text != nullptr)
             safe_strcpy(_password, text, sizeof(_password));
         break;
     }
-    if (text == NULL) {
+    if (text == nullptr) {
         network_shutdown_client();
     } else {
         network_send_password(_password);
diff --git a/src/openrct2/windows/NewCampaign.cpp b/src/openrct2/windows/NewCampaign.cpp
index 7295b39cd9..708c5f404a 100644
--- a/src/openrct2/windows/NewCampaign.cpp
+++ b/src/openrct2/windows/NewCampaign.cpp
@@ -65,34 +65,34 @@ static void window_new_campaign_invalidate(rct_window *w);
 static void window_new_campaign_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_new_campaign_events = {
-    NULL,
+    nullptr,
     window_new_campaign_mouseup,
-    NULL,
+    nullptr,
     window_new_campaign_mousedown,
     window_new_campaign_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_new_campaign_invalidate,
     window_new_campaign_paint,
-    NULL
+    nullptr
 };
 
 uint8 window_new_campaign_rides[MAX_RIDES];
@@ -132,7 +132,7 @@ void window_new_campaign_open(sint16 campaignType)
     sint32 i, numApplicableRides;
 
     w = window_bring_to_front_by_class(WC_NEW_CAMPAIGN);
-    if (w != NULL) {
+    if (w != nullptr) {
         if (w->campaign.campaign_type == campaignType)
             return;
 
@@ -206,7 +206,7 @@ static void window_new_campaign_get_shop_items()
     uint64 items = 0;
     FOR_ALL_RIDES(i, ride) {
         rct_ride_entry *rideType = get_ride_entry(ride->subtype);
-        if (rideType == NULL) {
+        if (rideType == nullptr) {
             continue;
         }
         uint8 itemType = rideType->shop_item;
diff --git a/src/openrct2/windows/NewRide.cpp b/src/openrct2/windows/NewRide.cpp
index 5422aaa33a..55d32fe398 100644
--- a/src/openrct2/windows/NewRide.cpp
+++ b/src/openrct2/windows/NewRide.cpp
@@ -214,31 +214,31 @@ static void window_new_ride_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, s
 
 // 0x0098E354
 static rct_window_event_list window_new_ride_events = {
-    NULL,
+    nullptr,
     window_new_ride_mouseup,
-    NULL,
+    nullptr,
     window_new_ride_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_new_ride_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_new_ride_scrollgetsize,
     window_new_ride_scrollmousedown,
-    NULL,
+    nullptr,
     window_new_ride_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_new_ride_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_new_ride_invalidate,
     window_new_ride_paint,
     window_new_ride_scrollpaint
@@ -452,7 +452,7 @@ rct_window *window_new_ride_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_CONSTRUCT_RIDE);
-    if (w != NULL)
+    if (w != nullptr)
         return w;
 
     // Not sure what these windows are
@@ -514,7 +514,7 @@ void window_new_ride_focus(ride_list_item rideItem)
     // Find the first non-null ride type index.
 
     w = window_find_by_class(WC_CONSTRUCT_RIDE);
-    if (w == NULL)
+    if (w == nullptr)
         return;
 
     rideEntry = get_ride_entry(rideItem.entry_index);
@@ -907,8 +907,8 @@ static ride_list_item window_new_ride_scroll_get_ride_list_item_at(rct_window *w
 static sint32 get_num_track_designs(ride_list_item item)
 {
     char entry[9];
-    const char *entryPtr = NULL;
-    rct_ride_entry * rideEntry = NULL;
+    const char *entryPtr = nullptr;
+    rct_ride_entry * rideEntry = nullptr;
 
     if (item.type < 0x80) {
         rideEntry = get_ride_entry(item.entry_index);
@@ -918,7 +918,7 @@ static sint32 get_num_track_designs(ride_list_item item)
         }
     }
 
-    if (rideEntry != NULL && ride_type_has_ride_groups(item.type))
+    if (rideEntry != nullptr && ride_type_has_ride_groups(item.type))
     {
         const ride_group * rideGroup = get_ride_group(item.type, rideEntry);
         return (sint32)track_repository_get_count_for_ride_group(item.type, rideGroup);
diff --git a/src/openrct2/windows/ObjectLoadError.cpp b/src/openrct2/windows/ObjectLoadError.cpp
index bf33e235bd..05254577db 100644
--- a/src/openrct2/windows/ObjectLoadError.cpp
+++ b/src/openrct2/windows/ObjectLoadError.cpp
@@ -70,37 +70,37 @@ static void window_object_load_error_scrollpaint(rct_window *w, rct_drawpixelinf
 static rct_window_event_list window_object_load_error_events = {
     window_object_load_error_close,
     window_object_load_error_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_object_load_error_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_object_load_error_scrollgetsize,
     window_object_load_error_scrollmousedown,
-    NULL,
+    nullptr,
     window_object_load_error_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_object_load_error_paint,
     window_object_load_error_scrollpaint
 };
 
-rct_object_entry * invalid_entries = NULL;
+rct_object_entry * invalid_entries = nullptr;
 sint32 highlighted_index = -1;
-utf8* file_path = NULL;
+utf8* file_path = nullptr;
 
 /**
 *  Returns an rct_string_id that represents an rct_object_entry's type.
@@ -162,7 +162,7 @@ static utf8* combine_object_names(rct_window *w)
         // Something's gone wrong, this shouldn't happen
         // We don't want to allocate stupidly large amounts of memory
         // for no reason, so bail
-        return NULL;
+        return nullptr;
     }
     utf8* buffer;
 
@@ -189,7 +189,7 @@ rct_window * window_object_load_error_open(utf8 * path, size_t numMissingObjects
 
     // Check if window is already open
     rct_window * window = window_bring_to_front_by_class(WC_OBJECT_LOAD_ERROR);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_centred(
             WW,
             WH,
@@ -328,10 +328,10 @@ static void window_object_load_error_scrollpaint(rct_window *w, rct_drawpixelinf
 
         // ... source game ...
         rct_string_id sourceStringId = object_manager_get_source_game_string(&invalid_entries[i]);
-        gfx_draw_string_left(dpi, sourceStringId, NULL, COLOUR_DARK_GREEN, SOURCE_COL_LEFT, y);
+        gfx_draw_string_left(dpi, sourceStringId, nullptr, COLOUR_DARK_GREEN, SOURCE_COL_LEFT, y);
 
         // ... and type
         rct_string_id type = get_object_type_string(&invalid_entries[i]);
-        gfx_draw_string_left(dpi, type, NULL, COLOUR_DARK_GREEN, TYPE_COL_LEFT, y);
+        gfx_draw_string_left(dpi, type, nullptr, COLOUR_DARK_GREEN, TYPE_COL_LEFT, y);
     }
 }
diff --git a/src/openrct2/windows/Park.cpp b/src/openrct2/windows/Park.cpp
index c7d2b40d14..dc3148a79a 100644
--- a/src/openrct2/windows/Park.cpp
+++ b/src/openrct2/windows/Park.cpp
@@ -206,215 +206,215 @@ static rct_window_event_list window_park_entrance_events = {
     window_park_entrance_resize,
     window_park_entrance_mousedown,
     window_park_entrance_dropdown,
-    NULL,
+    nullptr,
     window_park_entrance_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_entrance_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_entrance_invalidate,
     window_park_entrance_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_rating_events = {
-    NULL,
+    nullptr,
     window_park_rating_mouseup,
     window_park_rating_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_rating_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_rating_invalidate,
     window_park_rating_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_guests_events = {
-    NULL,
+    nullptr,
     window_park_guests_mouseup,
     window_park_guests_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_guests_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_guests_invalidate,
     window_park_guests_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_price_events = {
-    NULL,
+    nullptr,
     window_park_price_mouseup,
     window_park_price_resize,
     window_park_price_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_park_price_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_price_invalidate,
     window_park_price_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_stats_events = {
-    NULL,
+    nullptr,
     window_park_stats_mouseup,
     window_park_stats_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_stats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_stats_invalidate,
     window_park_stats_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_objective_events = {
-    NULL,
+    nullptr,
     window_park_objective_mouseup,
     window_park_objective_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_objective_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_objective_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_objective_invalidate,
     window_park_objective_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list window_park_awards_events = {
-    NULL,
+    nullptr,
     window_park_awards_mouseup,
     window_park_awards_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_awards_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_park_awards_invalidate,
     window_park_awards_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_park_page_events[] = {
@@ -602,7 +602,7 @@ void window_park_entrance_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_PARK_INFORMATION);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_park_open();
         window->viewport_focus_coordinates.y = -1;
         window->viewport_focus_coordinates.x = -1;
@@ -744,7 +744,7 @@ static void window_park_entrance_update(rct_window *w)
  */
 static void window_park_entrance_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex == WIDX_RENAME && text != NULL)
+    if (widgetIndex == WIDX_RENAME && text != nullptr)
         park_set_name(text);
 }
 
@@ -839,7 +839,7 @@ static void window_park_entrance_paint(rct_window *w, rct_drawpixelinfo *dpi)
     window_park_draw_tab_images(dpi, w);
 
     // Draw viewport
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         window_draw_viewport(dpi, w);
         if (w->viewport->flags & VIEWPORT_FLAG_SOUND_ON)
             gfx_draw_sprite(dpi, SPR_HEARING_VIEWPORT, w->x + 2, w->y + 2, 0);
@@ -886,14 +886,14 @@ static void window_park_init_viewport(rct_window *w)
         }
     }
 
-    if (w->viewport == NULL) {
+    if (w->viewport == nullptr) {
         viewportFlags = gConfigGeneral.always_show_gridlines ? VIEWPORT_FLAG_GRIDLINES : 0;
     } else {
         // if (w->var_482 == x && w->var_484 == y && w->var_486 == z && (uint16)w->var_488 >> 8 == r)
         //  return;
 
         viewport = w->viewport;
-        w->viewport = NULL;
+        w->viewport = nullptr;
         viewportFlags = viewport->flags;
         viewport->width = 0;
         viewport_update_pointers();
@@ -910,7 +910,7 @@ static void window_park_init_viewport(rct_window *w)
 
     if (zr != 0xFFFF) {
         // Create viewport
-        if (w->viewport == NULL) {
+        if (w->viewport == nullptr) {
             rct_widget *viewportWidget = &window_park_entrance_widgets[WIDX_VIEWPORT];
             viewport_create(
                 w,
@@ -930,7 +930,7 @@ static void window_park_init_viewport(rct_window *w)
         }
     }
 
-    if (w->viewport != NULL)
+    if (w->viewport != nullptr)
         w->viewport->flags = viewportFlags;
     window_invalidate(w);
 }
@@ -948,7 +948,7 @@ void window_park_rating_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_PARK_INFORMATION);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_park_open();
         window->viewport_focus_coordinates.x = -1;
         window->viewport_focus_coordinates.y = -1;
@@ -958,7 +958,7 @@ void window_park_rating_open()
     if (window->classification == gCurrentToolWidget.window_classification && window->number == gCurrentToolWidget.window_number)
         tool_cancel();
 
-    window->viewport = NULL;
+    window->viewport = nullptr;
     window->page = WINDOW_PARK_PAGE_RATING;
     window_invalidate(window);
     window->widgets = window_park_rating_widgets;
@@ -1062,7 +1062,7 @@ void window_park_guests_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_PARK_INFORMATION);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_park_open();
         window->viewport_focus_coordinates.x = -1;
         window->viewport_focus_coordinates.y = -1;
@@ -1072,7 +1072,7 @@ void window_park_guests_open()
         if (window->classification == gCurrentToolWidget.window_classification && window->number == gCurrentToolWidget.window_number)
             tool_cancel();
 
-    window->viewport = NULL;
+    window->viewport = nullptr;
     window->page = WINDOW_PARK_PAGE_GUESTS;
     window_invalidate(window);
     window->widgets = window_park_guests_widgets;
@@ -1426,7 +1426,7 @@ void window_park_objective_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_PARK_INFORMATION);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_park_open();
         window->viewport_focus_coordinates.x = -1;
         window->viewport_focus_coordinates.y = -1;
@@ -1436,7 +1436,7 @@ void window_park_objective_open()
         if (window->classification == gCurrentToolWidget.window_classification && window->number == gCurrentToolWidget.window_number)
             tool_cancel();
 
-    window->viewport = NULL;
+    window->viewport = nullptr;
     window->page = WINDOW_PARK_PAGE_OBJECTIVE;
     window_invalidate(window);
     window->widgets = window_park_objective_widgets;
@@ -1507,7 +1507,7 @@ static void window_park_objective_update(rct_window *w)
  */
 static void window_park_objective_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex == WIDX_ENTER_NAME && text != NULL && text[0] != 0) {
+    if (widgetIndex == WIDX_ENTER_NAME && text != nullptr && text[0] != 0) {
         scenario_success_submit_name(text);
         window_invalidate(w);
     }
@@ -1552,7 +1552,7 @@ static void window_park_objective_paint(rct_window *w, rct_drawpixelinfo *dpi)
     y += 5;
 
     // Your objective:
-    gfx_draw_string_left(dpi, STR_OBJECTIVE_LABEL, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_OBJECTIVE_LABEL, nullptr, COLOUR_BLACK, x, y);
     y += 10;
 
     // Objective
@@ -1567,7 +1567,7 @@ static void window_park_objective_paint(rct_window *w, rct_drawpixelinfo *dpi)
     if (gScenarioCompletedCompanyValue != MONEY32_UNDEFINED) {
         if ((uint32)gScenarioCompletedCompanyValue == 0x80000001) {
             // Objective failed
-            gfx_draw_string_left_wrapped(dpi, NULL, x, y, 222, STR_OBJECTIVE_FAILED, COLOUR_BLACK);
+            gfx_draw_string_left_wrapped(dpi, nullptr, x, y, 222, STR_OBJECTIVE_FAILED, COLOUR_BLACK);
         } else {
             // Objective completed
             set_format_arg(0, money32, gScenarioCompletedCompanyValue);
@@ -1589,7 +1589,7 @@ void window_park_awards_open()
     rct_window* window;
 
     window = window_bring_to_front_by_class(WC_PARK_INFORMATION);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_park_open();
         window->viewport_focus_coordinates.x = -1;
         window->viewport_focus_coordinates.y = -1;
@@ -1599,7 +1599,7 @@ void window_park_awards_open()
         if (window->classification == gCurrentToolWidget.window_classification && window->number == gCurrentToolWidget.window_number)
             tool_cancel();
 
-    window->viewport = NULL;
+    window->viewport = nullptr;
     window->page = WINDOW_PARK_PAGE_AWARDS;
     window_invalidate(window);
     window->widgets = window_park_awards_widgets;
@@ -1679,14 +1679,14 @@ static void window_park_awards_paint(rct_window *w, rct_drawpixelinfo *dpi)
             continue;
 
         gfx_draw_sprite(dpi, ParkAwards[award->Type].sprite, x, y, 0);
-        gfx_draw_string_left_wrapped(dpi, NULL, x + 34, y + 6, 180, ParkAwards[award->Type].text, COLOUR_BLACK);
+        gfx_draw_string_left_wrapped(dpi, nullptr, x + 34, y + 6, 180, ParkAwards[award->Type].text, COLOUR_BLACK);
 
         y += 32;
         count++;
     }
 
     if (count == 0)
-        gfx_draw_string_left(dpi, STR_NO_RECENT_AWARDS, NULL, COLOUR_BLACK, x + 6, y + 6);
+        gfx_draw_string_left(dpi, STR_NO_RECENT_AWARDS, nullptr, COLOUR_BLACK, x + 6, y + 6);
 }
 
 #pragma endregion
@@ -1707,15 +1707,15 @@ static void window_park_set_page(rct_window *w, sint32 page)
 
     // Set listen only to viewport
     listen = 0;
-    if (page == WINDOW_PARK_PAGE_ENTRANCE && w->page == WINDOW_PARK_PAGE_ENTRANCE && w->viewport != NULL && !(w->viewport->flags & VIEWPORT_FLAG_SOUND_ON))
+    if (page == WINDOW_PARK_PAGE_ENTRANCE && w->page == WINDOW_PARK_PAGE_ENTRANCE && w->viewport != nullptr && !(w->viewport->flags & VIEWPORT_FLAG_SOUND_ON))
         listen++;
 
     w->page = page;
     w->frame_no = 0;
     w->var_492 = 0;
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
     }
 
     w->enabled_widgets = window_park_page_enabled_widgets[page];
@@ -1728,7 +1728,7 @@ static void window_park_set_page(rct_window *w, sint32 page)
     window_event_resize_call(w);
     window_event_invalidate_call(w);
     window_event_update_call(w);
-    if (listen != 0 && w->viewport != NULL)
+    if (listen != 0 && w->viewport != nullptr)
         w->viewport->flags |= VIEWPORT_FLAG_SOUND_ON;
 }
 
diff --git a/src/openrct2/windows/Player.cpp b/src/openrct2/windows/Player.cpp
index 76c212b3cf..e03f933903 100644
--- a/src/openrct2/windows/Player.cpp
+++ b/src/openrct2/windows/Player.cpp
@@ -98,29 +98,29 @@ static rct_window_event_list window_player_overview_events = {
     window_player_overview_resize,
     window_player_overview_mouse_down,
     window_player_overview_dropdown,
-    NULL,
+    nullptr,
     window_player_overview_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_player_overview_invalidate,
     window_player_overview_paint,
-    NULL
+    nullptr
 };
 
 static void window_player_statistics_close(rct_window *w);
@@ -134,31 +134,31 @@ static rct_window_event_list window_player_statistics_events = {
     window_player_statistics_close,
     window_player_statistics_mouse_up,
     window_player_statistics_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_player_statistics_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_player_statistics_invalidate,
     window_player_statistics_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_player_page_events[] = {
@@ -192,7 +192,7 @@ void window_player_open(uint8 id)
     rct_window* window;
 
     window = window_bring_to_front_by_number(WC_PLAYER, id);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_auto_pos(240, 170, &window_player_overview_events, WC_PLAYER, WF_RESIZABLE);
         window->number = id;
         window->page = 0;
@@ -273,7 +273,7 @@ void window_player_overview_mouse_up(rct_window *w, rct_widgetindex widgetIndex)
         break;
     case WIDX_LOCATE:{
         rct_window* mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             sint32 player = network_get_player_index((uint8)w->number);
             if (player == -1) {
                 return;
@@ -392,7 +392,7 @@ void window_player_overview_paint(rct_window *w, rct_drawpixelinfo *dpi)
     }
     gfx_draw_string_centred_clipped(dpi, STR_LAST_ACTION_RAN, gCommonFormatArgs, COLOUR_BLACK, x, y, width);
 
-    if (w->viewport != NULL && w->var_492 != -1) {
+    if (w->viewport != nullptr && w->var_492 != -1) {
         window_draw_viewport(dpi, w);
     }
 }
@@ -433,7 +433,7 @@ void window_player_overview_invalidate(rct_window *w)
     window_align_tabs(w, WIDX_TAB_1, WIDX_TAB_2);
 
     rct_viewport *viewport = w->viewport;
-    if (viewport != NULL) {
+    if (viewport != nullptr) {
         rct_widget *viewportWidget = &window_player_overview_widgets[WIDX_VIEWPORT];
 
         viewport->x = w->x + viewportWidget->left;
@@ -548,7 +548,7 @@ static void window_player_set_page(rct_window* w, sint32 page)
     window_invalidate(w);
 
     if (page == WINDOW_PLAYER_PAGE_OVERVIEW) {
-        if (w->viewport == NULL) {
+        if (w->viewport == nullptr) {
             viewport_create(w, w->x, w->y, w->width, w->height, 0, 128 * 32, 128 * 32, 0, 1, -1);
             w->flags |= WF_NO_SCROLLING;
             window_event_invalidate_call(w);
@@ -558,9 +558,9 @@ static void window_player_set_page(rct_window* w, sint32 page)
             window_player_update_viewport(w, false);
         }
     } else {
-        if (w->viewport != NULL) {
+        if (w->viewport != nullptr) {
             w->viewport->width = 0;
-            w->viewport = NULL;
+            w->viewport = nullptr;
         }
     }
 }
@@ -602,7 +602,7 @@ static void window_player_update_viewport(rct_window *w, bool scroll)
     }
 
     rct_viewport *viewport = w->viewport;
-    if (viewport != NULL) {
+    if (viewport != nullptr) {
         rct_xyz16 coord = network_get_player_last_action_coord(playerIndex);
         if (coord.x != 0 || coord.y != 0 || coord.z != 0) {
             sint32 viewX, viewY;
diff --git a/src/openrct2/windows/Research.cpp b/src/openrct2/windows/Research.cpp
index 94f6d0fe5c..afcc7c6e0d 100644
--- a/src/openrct2/windows/Research.cpp
+++ b/src/openrct2/windows/Research.cpp
@@ -115,66 +115,66 @@ static void window_research_funding_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
 //
 static rct_window_event_list window_research_development_events = {
-    NULL,
+    nullptr,
     window_research_development_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_research_development_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_research_development_invalidate,
     window_research_development_paint,
-    NULL
+    nullptr
 };
 
 // 0x009890E8
 static rct_window_event_list window_research_funding_events = {
-    NULL,
+    nullptr,
     window_research_funding_mouseup,
-    NULL,
+    nullptr,
     window_research_funding_mousedown,
     window_research_funding_dropdown,
-    NULL,
+    nullptr,
     window_research_funding_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_research_funding_invalidate,
     window_research_funding_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_research_page_events[] = {
@@ -236,7 +236,7 @@ void window_research_open()
     rct_window *w;
 
     w = window_bring_to_front_by_class(WC_RESEARCH);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_create_auto_pos(530, 257, window_research_page_events[0], WC_RESEARCH, WF_10);
         w->widgets = window_research_page_widgets[0];
         w->enabled_widgets = window_research_page_enabled_widgets[0];
@@ -398,7 +398,7 @@ void window_research_development_page_paint(rct_window *w, rct_drawpixelinfo *dp
     if (typeId != 0xFFFFFFFF) {
         if (typeId >= 0x10000) {
             rct_ride_entry *rideEntry = get_ride_entry(typeId & 0xFF);
-            if (rideEntry == NULL) {
+            if (rideEntry == nullptr) {
                 return;
             }
             stringId = (rideEntry->flags & RIDE_ENTRY_FLAG_SEPARATE_RIDE_NAME) ?
@@ -408,7 +408,7 @@ void window_research_development_page_paint(rct_window *w, rct_drawpixelinfo *dp
             lastDevelopmentFormat = STR_RESEARCH_RIDE_LABEL;
         } else {
             rct_scenery_set_entry *sse = get_scenery_group_entry(typeId);
-            if (sse == NULL) {
+            if (sse == nullptr) {
                 return;
             }
             stringId = sse->name;
@@ -594,9 +594,9 @@ static void window_research_set_page(rct_window *w, sint32 page)
 {
     w->page = page;
     w->frame_no = 0;
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
     }
 
     w->enabled_widgets = window_research_page_enabled_widgets[page];
diff --git a/src/openrct2/windows/Ride.cpp b/src/openrct2/windows/Ride.cpp
index e37120a892..0346aeb654 100644
--- a/src/openrct2/windows/Ride.cpp
+++ b/src/openrct2/windows/Ride.cpp
@@ -621,63 +621,63 @@ static void window_ride_set_page(rct_window *w, sint32 page);
 
 // 0x0098DFD4
 static rct_window_event_list window_ride_main_events = {
-    NULL,
+    nullptr,
     window_ride_main_mouseup,
     window_ride_main_resize,
     window_ride_main_mousedown,
     window_ride_main_dropdown,
-    NULL,
+    nullptr,
     window_ride_main_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_main_textinput,
     window_ride_main_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_main_invalidate,
     window_ride_main_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098E204
 static rct_window_event_list window_ride_vehicle_events = {
-    NULL,
+    nullptr,
     window_ride_vehicle_mouseup,
     window_ride_vehicle_resize,
     window_ride_vehicle_mousedown,
     window_ride_vehicle_dropdown,
-    NULL,
+    nullptr,
     window_ride_vehicle_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_vehicle_invalidate,
     window_ride_vehicle_paint,
     window_ride_vehicle_scrollpaint
@@ -685,66 +685,66 @@ static rct_window_event_list window_ride_vehicle_events = {
 
 // 0x0098E0B4
 static rct_window_event_list window_ride_operating_events = {
-    NULL,
+    nullptr,
     window_ride_operating_mouseup,
     window_ride_operating_resize,
     window_ride_operating_mousedown,
     window_ride_operating_dropdown,
-    NULL,
+    nullptr,
     window_ride_operating_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_operating_invalidate,
     window_ride_operating_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098E124
 static rct_window_event_list window_ride_maintenance_events = {
-    NULL,
+    nullptr,
     window_ride_maintenance_mouseup,
     window_ride_maintenance_resize,
     window_ride_maintenance_mousedown,
     window_ride_maintenance_dropdown,
-    NULL,
+    nullptr,
     window_ride_maintenance_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_maintenance_invalidate,
     window_ride_maintenance_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098E044
@@ -754,26 +754,26 @@ static rct_window_event_list window_ride_colour_events = {
     window_ride_colour_resize,
     window_ride_colour_mousedown,
     window_ride_colour_dropdown,
-    NULL,
+    nullptr,
     window_ride_colour_update,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_colour_tooldown,
     window_ride_colour_tooldrag,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_colour_invalidate,
     window_ride_colour_paint,
     window_ride_colour_scrollpaint
@@ -781,34 +781,34 @@ static rct_window_event_list window_ride_colour_events = {
 
 // 0x0098E194
 static rct_window_event_list window_ride_music_events = {
-    NULL,
+    nullptr,
     window_ride_music_mouseup,
     window_ride_music_resize,
     window_ride_music_mousedown,
     window_ride_music_dropdown,
-    NULL,
+    nullptr,
     window_ride_music_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_music_invalidate,
     window_ride_music_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098DE14
@@ -818,58 +818,58 @@ static rct_window_event_list window_ride_measurements_events = {
     window_ride_measurements_resize,
     window_ride_measurements_mousedown,
     window_ride_measurements_dropdown,
-    NULL,
+    nullptr,
     window_ride_measurements_update,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_measurements_tooldown,
     window_ride_measurements_tooldrag,
-    NULL,
+    nullptr,
     window_ride_measurements_toolabort,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_measurements_invalidate,
     window_ride_measurements_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098DF64
 static rct_window_event_list window_ride_graphs_events = {
-    NULL,
+    nullptr,
     window_ride_graphs_mouseup,
     window_ride_graphs_resize,
     window_ride_graphs_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_ride_graphs_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_graphs_scrollgetheight,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_graphs_15,
     window_ride_graphs_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_ride_graphs_invalidate,
     window_ride_graphs_paint,
     window_ride_graphs_scrollpaint
@@ -877,66 +877,66 @@ static rct_window_event_list window_ride_graphs_events = {
 
 // 0x0098DEF4
 static rct_window_event_list window_ride_income_events = {
-    NULL,
+    nullptr,
     window_ride_income_mouseup,
     window_ride_income_resize,
     window_ride_income_mousedown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_ride_income_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_income_invalidate,
     window_ride_income_paint,
-    NULL
+    nullptr
 };
 
 // 0x0098DE84
 static rct_window_event_list window_ride_customer_events = {
-    NULL,
+    nullptr,
     window_ride_customer_mouseup,
     window_ride_customer_resize,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_customer_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_customer_invalidate,
     window_ride_customer_paint,
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_ride_page_events[] = {
@@ -1427,7 +1427,7 @@ static void window_ride_disable_tabs(rct_window *w)
 
     rct_ride_entry *type = get_ride_entry(ride->subtype);
 
-    if (type == NULL) {
+    if (type == nullptr) {
         disabled_tabs |= 1 << WIDX_TAB_2 | 1 << WIDX_TAB_3 | 1 << WIDX_TAB_4 | 1 << WIDX_TAB_5 | 1 << WIDX_TAB_6
                        | 1 << WIDX_TAB_7 | 1 << WIDX_TAB_8 | 1 << WIDX_TAB_9 | 1 << WIDX_TAB_10;
     } else if ((type->flags & RIDE_ENTRY_FLAG_DISABLE_COLOUR_TAB) != 0)
@@ -1528,7 +1528,7 @@ rct_window *window_ride_main_open(sint32 rideIndex)
     rct_window *w;
 
     w = window_bring_to_front_by_number(WC_RIDE, rideIndex);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_ride_open(rideIndex);
         w->ride.var_482 = -1;
     }
@@ -1566,7 +1566,7 @@ rct_window *window_ride_open_station(sint32 rideIndex, sint32 stationIndex)
         return window_ride_main_open(rideIndex);
 
     w = window_bring_to_front_by_number(WC_RIDE, rideIndex);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_ride_open(rideIndex);
         w->ride.var_482 = -1;
     }
@@ -1645,7 +1645,7 @@ rct_window *window_ride_open_vehicle(rct_vehicle *vehicle)
 
 
     rct_window *w = window_find_by_number(WC_RIDE, rideIndex);
-    if (w != NULL) {
+    if (w != nullptr) {
         window_invalidate(w);
 
         if (
@@ -1666,7 +1666,7 @@ rct_window *window_ride_open_vehicle(rct_vehicle *vehicle)
 
                 numPeepsLeft--;
                 rct_window *w2 = window_find_by_number(WC_PEEP, peepSpriteIndex);
-                if (w2 == NULL) {
+                if (w2 == nullptr) {
                     rct_peep *peep = &(get_sprite(peepSpriteIndex)->peep);
                     window_guest_open(peep);
                     openedPeepWindow = 1;
@@ -1681,7 +1681,7 @@ rct_window *window_ride_open_vehicle(rct_vehicle *vehicle)
             window_bring_to_front_by_number(WC_RIDE, rideIndex);
     }
 
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_ride_open(rideIndex);
         w->ride.var_482 = -1;
     }
@@ -1721,7 +1721,7 @@ static void window_ride_set_page(rct_window *w, sint32 page)
 
     // Set listen only to viewport
     listen = 0;
-    if (page == WINDOW_RIDE_PAGE_MAIN && w->page == WINDOW_RIDE_PAGE_MAIN && w->viewport != NULL && !(w->viewport->flags & VIEWPORT_FLAG_SOUND_ON))
+    if (page == WINDOW_RIDE_PAGE_MAIN && w->page == WINDOW_RIDE_PAGE_MAIN && w->viewport != nullptr && !(w->viewport->flags & VIEWPORT_FLAG_SOUND_ON))
         listen++;
 
     w->page = page;
@@ -1733,9 +1733,9 @@ static void window_ride_set_page(rct_window *w, sint32 page)
         //ride_update_max_vehicles(w->number);
     //}
 
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
     }
 
     w->enabled_widgets = window_ride_page_enabled_widgets[page];
@@ -1751,7 +1751,7 @@ static void window_ride_set_page(rct_window *w, sint32 page)
     window_init_scroll_widgets(w);
     window_invalidate(w);
 
-    if (listen != 0 && w->viewport != NULL)
+    if (listen != 0 && w->viewport != nullptr)
         w->viewport->flags |= VIEWPORT_FLAG_SOUND_ON;
 }
 
@@ -1851,7 +1851,7 @@ static void window_ride_init_viewport(rct_window *w)
 
     uint16 viewport_flags = 0;
 
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         if (focus.coordinate.x == w->viewport_focus_coordinates.x &&
             focus.coordinate.y == w->viewport_focus_coordinates.y &&
             focus.coordinate.z == w->viewport_focus_coordinates.z &&
@@ -1864,7 +1864,7 @@ static void window_ride_init_viewport(rct_window *w)
         }
         viewport_flags = w->viewport->flags;
         w->viewport->width = 0;
-        w->viewport = NULL;
+        w->viewport = nullptr;
 
         viewport_update_pointers();
     } else if (gConfigGeneral.always_show_gridlines) {
@@ -1953,7 +1953,7 @@ static void window_ride_main_mouseup(rct_window *w, rct_widgetindex widgetIndex)
     case WIDX_CONSTRUCTION:
         rideIndex = (uint8)w->number;
         ride_construct(rideIndex);
-        if (window_find_by_number(WC_RIDE_CONSTRUCTION, rideIndex) != NULL) {
+        if (window_find_by_number(WC_RIDE_CONSTRUCTION, rideIndex) != nullptr) {
             window_close(w);
         }
         break;
@@ -2310,7 +2310,7 @@ static void window_ride_main_update(rct_window *w)
  */
 static void window_ride_main_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex != WIDX_RENAME || text == NULL)
+    if (widgetIndex != WIDX_RENAME || text == nullptr)
         return;
 
     ride_set_name(w->number, text);
@@ -2589,7 +2589,7 @@ static void window_ride_main_paint(rct_window *w, rct_drawpixelinfo *dpi)
     window_ride_draw_tab_images(dpi, w);
 
     // Viewport and ear icon
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         window_draw_viewport(dpi, w);
         if (w->viewport->flags & VIEWPORT_FLAG_SOUND_ON)
             gfx_draw_sprite(dpi, SPR_HEARING_VIEWPORT, w->x + 2, w->y + 2, 0);
@@ -2931,7 +2931,7 @@ static void window_ride_vehicle_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     // Capacity
     void * loadedObject = object_manager_get_loaded_object_by_index(ride->subtype);
-    if (loadedObject != NULL)
+    if (loadedObject != nullptr)
     {
         const utf8 * capacity = object_get_capacity(loadedObject);
         set_format_arg(0, rct_string_id, STR_STRING);
@@ -3649,10 +3649,10 @@ static void window_ride_locate_mechanic(rct_window *w)
     mechanic = ride_get_assigned_mechanic(ride);
 
     // Otherwise find the closest mechanic
-    if (mechanic == NULL)
+    if (mechanic == nullptr)
         mechanic = ride_find_closest_mechanic(ride, 1);
 
-    if (mechanic == NULL)
+    if (mechanic == nullptr)
         window_error_open(STR_UNABLE_TO_LOCATE_MECHANIC, STR_NONE);
     else
         window_staff_open(mechanic);
@@ -3722,7 +3722,7 @@ static void window_ride_maintenance_mousedown(rct_window *w, rct_widgetindex wid
 {
     rct_ride *ride = get_ride(w->number);
     rct_ride_entry *ride_type = get_ride_entry(ride->subtype);
-    if (ride_type == NULL) {
+    if (ride_type == nullptr) {
         return;
     }
 
@@ -3973,7 +3973,7 @@ static void window_ride_maintenance_paint(rct_window *w, rct_drawpixelinfo *dpi)
     widget = &window_ride_maintenance_widgets[WIDX_INSPECTION_INTERVAL];
     x = w->x + 4;
     y = w->y + widget->top + 1;
-    gfx_draw_string_left(dpi, STR_INSPECTION, NULL, COLOUR_BLACK, x, y);
+    gfx_draw_string_left(dpi, STR_INSPECTION, nullptr, COLOUR_BLACK, x, y);
 
     // Reliability
     widget = &window_ride_maintenance_widgets[WIDX_PAGE_BACKGROUND];
@@ -4046,7 +4046,7 @@ static void window_ride_maintenance_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
         if (stringId != 0) {
             if (stringId == STR_CALLING_MECHANIC || stringId == STR_NO_MECHANICS_ARE_HIRED_MESSAGE) {
-                gfx_draw_string_left_wrapped(dpi, NULL, x + 4, y, 280, stringId, COLOUR_BLACK);
+                gfx_draw_string_left_wrapped(dpi, nullptr, x + 4, y, 280, stringId, COLOUR_BLACK);
             } else {
                 rct_peep *mechanicSprite = &(get_sprite(ride->mechanic)->peep);
                 if (peep_is_mechanic(mechanicSprite)) {
@@ -4105,7 +4105,7 @@ static void window_ride_set_track_colour_scheme(rct_window *w, sint32 x, sint32
     newColourScheme = (uint8)w->ride_colour;
 
     rct_xy16 mapCoord = { 0 };
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_RIDE, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_RIDE, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, nullptr);
     x = mapCoord.x;
     y = mapCoord.y;
 
@@ -4118,7 +4118,7 @@ static void window_ride_set_track_colour_scheme(rct_window *w, sint32 x, sint32
 
     z = mapElement->base_height * 8;
     direction = map_element_get_direction(mapElement);
-    sub_6C683D(&x, &y, &z, direction, mapElement->properties.track.type, newColourScheme, NULL, 4);
+    sub_6C683D(&x, &y, &z, direction, mapElement->properties.track.type, newColourScheme, nullptr, 4);
 }
 
 /**
@@ -5164,7 +5164,7 @@ static void window_ride_measurements_tooldown(rct_window *w, rct_widgetindex wid
     _lastSceneryY = y;
     _collectTrackDesignScenery = true; // Default to true in case user does not select anything valid
 
-    get_map_coordinates_from_pos(x, y, 0xFCCF, &mapX, &mapY, &interactionType, &mapElement, NULL);
+    get_map_coordinates_from_pos(x, y, 0xFCCF, &mapX, &mapY, &interactionType, &mapElement, nullptr);
     switch (interactionType) {
     case VIEWPORT_INTERACTION_ITEM_SCENERY:
     case VIEWPORT_INTERACTION_ITEM_LARGE_SCENERY:
@@ -5187,7 +5187,7 @@ static void window_ride_measurements_tooldrag(rct_window *w, rct_widgetindex wid
     sint16 mapX, mapY;
     sint32 interactionType;
 
-    get_map_coordinates_from_pos(x, y, 0xFCCF, &mapX, &mapY, &interactionType, &mapElement, NULL);
+    get_map_coordinates_from_pos(x, y, 0xFCCF, &mapX, &mapY, &interactionType, &mapElement, nullptr);
     switch (interactionType) {
     case VIEWPORT_INTERACTION_ITEM_SCENERY:
     case VIEWPORT_INTERACTION_ITEM_LARGE_SCENERY:
@@ -5273,7 +5273,7 @@ static void window_ride_measurements_paint(rct_window *w, rct_drawpixelinfo *dpi
 
         sint32 x = w->x + (widget->right - widget->left) / 2;
         sint32 y = w->y + widget->top + 40;
-        gfx_draw_string_centred_wrapped(dpi, NULL, x, y, w->width - 8, STR_CLICK_ITEMS_OF_SCENERY_TO_SELECT, COLOUR_BLACK);
+        gfx_draw_string_centred_wrapped(dpi, nullptr, x, y, w->width - 8, STR_CLICK_ITEMS_OF_SCENERY_TO_SELECT, COLOUR_BLACK);
 
         x = w->x + 4;
         y = w->y + window_ride_measurements_widgets[WIDX_SELECT_NEARBY_SCENERY].bottom + 17;
@@ -5438,7 +5438,7 @@ static void window_ride_measurements_paint(rct_window *w, rct_drawpixelinfo *dpi
                 }
             }
         } else {
-            gfx_draw_string_left(dpi, STR_NO_TEST_RESULTS_YET, NULL, COLOUR_BLACK, x, y);
+            gfx_draw_string_left(dpi, STR_NO_TEST_RESULTS_YET, nullptr, COLOUR_BLACK, x, y);
         }
     }
 }
@@ -5544,8 +5544,8 @@ static void window_ride_graphs_update(rct_window *w)
     widget = &window_ride_graphs_widgets[WIDX_GRAPH];
     x = w->scrolls[0].h_left;
     if (!(w->list_information_type & 0x8000)) {
-        measurement = ride_get_measurement(w->number, NULL);
-        x = measurement == NULL ?
+        measurement = ride_get_measurement(w->number, nullptr);
+        x = measurement == nullptr ?
             0 :
             measurement->current_item - (((widget->right - widget->left) / 4) * 3);
     }
@@ -5568,8 +5568,8 @@ static void window_ride_graphs_scrollgetheight(rct_window *w, sint32 scrollIndex
     *width = window_ride_graphs_widgets[WIDX_GRAPH].right - window_ride_graphs_widgets[WIDX_GRAPH].left - 2;
 
     // Get measurement size
-    measurement = ride_get_measurement(w->number, NULL);
-    if (measurement != NULL)
+    measurement = ride_get_measurement(w->number, nullptr);
+    if (measurement != nullptr)
         *width = Math::Max<sint32>(*width, measurement->num_items);
 }
 
@@ -5592,7 +5592,7 @@ static void window_ride_graphs_tooltip(rct_window* w, rct_widgetindex widgetInde
         set_format_arg(0, rct_string_id, STR_GRAPH);
         rct_string_id message;
         rct_ride_measurement *measurement = ride_get_measurement(w->number, &message);
-        if (measurement != NULL && (measurement->flags & RIDE_MEASUREMENT_FLAG_RUNNING)) {
+        if (measurement != nullptr && (measurement->flags & RIDE_MEASUREMENT_FLAG_RUNNING)) {
             set_format_arg(4, uint16, measurement->vehicle_index + 1);
             rct_ride *ride = get_ride(w->number);
             set_format_arg(2, rct_string_id, RideComponentNames[RideNameConvention[ride->type].vehicle].count);
@@ -5685,7 +5685,7 @@ static void window_ride_graphs_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi
     rct_widget *widget = &window_ride_graphs_widgets[WIDX_GRAPH];
     rct_string_id stringId;
     rct_ride_measurement *measurement = ride_get_measurement(w->number, &stringId);
-    if (measurement == NULL) {
+    if (measurement == nullptr) {
         // No measurement message
         sint32 x = (widget->right - widget->left) / 2;
         sint32 y = (widget->bottom - widget->top) / 2 - 5;
diff --git a/src/openrct2/windows/RideConstruction.cpp b/src/openrct2/windows/RideConstruction.cpp
index a9cfbc0e9d..d53d931ccf 100644
--- a/src/openrct2/windows/RideConstruction.cpp
+++ b/src/openrct2/windows/RideConstruction.cpp
@@ -153,29 +153,29 @@ static rct_window_event_list window_ride_construction_events = {
     window_ride_construction_resize,
     window_ride_construction_mousedown,
     window_ride_construction_dropdown,
-    NULL,
+    nullptr,
     window_ride_construction_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_ride_construction_toolupdate,
     window_ride_construction_tooldown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_construction_invalidate,
     window_ride_construction_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -529,7 +529,7 @@ static sint32 ride_get_alternative_type(rct_ride *ride)
 static void close_ride_window_for_construction(rct_windownumber number)
 {
     rct_window* w = window_find_by_number(WC_RIDE, number);
-    if (w != NULL && w->page == 1)
+    if (w != nullptr && w->page == 1)
         window_close(w);
 }
 
@@ -652,7 +652,7 @@ static void window_ride_construction_close(rct_window *w)
     hide_gridlines();
 
     uint8 rideIndex = _currentRideIndex;
-    if (ride_try_get_origin_element(rideIndex, NULL)) {
+    if (ride_try_get_origin_element(rideIndex, nullptr)) {
         rct_ride *ride = get_ride(rideIndex);
         // Auto open shops if required.
         if (ride->mode == RIDE_MODE_SHOP_STALL && gConfigGeneral.auto_open_shops) {
@@ -1230,12 +1230,12 @@ static void window_ride_construction_resize(rct_window *w)
     }
     if (_rideConstructionState == RIDE_CONSTRUCTION_STATE_FRONT) {
         disabledWidgets |= (1ULL << WIDX_NEXT_SECTION);
-        if (_sub_6CA2DF(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)) {
+        if (_sub_6CA2DF(nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr)) {
             disabledWidgets |= (1ULL << WIDX_CONSTRUCT);
         }
     } else if (_rideConstructionState == RIDE_CONSTRUCTION_STATE_BACK) {
         disabledWidgets |= (1ULL << WIDX_PREVIOUS_SECTION);
-        if (_sub_6CA2DF(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)) {
+        if (_sub_6CA2DF(nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr)) {
             disabledWidgets |= (1ULL << WIDX_CONSTRUCT);
         }
     }
@@ -1885,7 +1885,7 @@ void window_ride_construction_mouseup_demolish_next_piece(sint32 x, sint32 y, si
         sint32 b4 = _currentTrackLiftHill;
         ride_construction_set_default_next_piece();
         window_ride_construction_update_active_elements();
-        if (!ride_try_get_origin_element(_currentRideIndex, NULL)) {
+        if (!ride_try_get_origin_element(_currentRideIndex, nullptr)) {
             ride_initialise_construction_window(_currentRideIndex);
             _currentTrackPieceDirection = direction;
             if (!(slope & 0x100)) {
@@ -1954,7 +1954,7 @@ static void window_ride_construction_rotate(rct_window *w)
 static void window_ride_construction_entrance_click(rct_window *w)
 {
     if (tool_set(w, WIDX_ENTRANCE, TOOL_CROSSHAIR)) {
-        if (!ride_try_get_origin_element(_currentRideIndex, NULL)) {
+        if (!ride_try_get_origin_element(_currentRideIndex, nullptr)) {
             ride_initialise_construction_window(_currentRideIndex);
         }
     } else {
@@ -1978,7 +1978,7 @@ static void window_ride_construction_entrance_click(rct_window *w)
 static void window_ride_construction_exit_click(rct_window *w)
 {
     if (tool_set(w, WIDX_EXIT, TOOL_CROSSHAIR)) {
-        if (!ride_try_get_origin_element(_currentRideIndex, NULL)) {
+        if (!ride_try_get_origin_element(_currentRideIndex, nullptr)) {
             ride_initialise_construction_window(_currentRideIndex);
         }
     } else {
@@ -2216,7 +2216,7 @@ static void window_ride_construction_paint(rct_window *w, rct_drawpixelinfo *dpi
         return;
 
     sint32 trackType, trackDirection, rideIndex, liftHillAndAlternativeState;
-    if (_sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, NULL, NULL, NULL, NULL))
+    if (_sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, nullptr, nullptr, nullptr, nullptr))
         return;
 
     // Draw track piece
@@ -2467,7 +2467,7 @@ void window_ride_construction_update_active_elements()
 
     window_ride_construction_update_enabled_track_pieces();
     w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL)
+    if (w == nullptr)
         return;
 
     window_ride_construction_update_map_selection();
@@ -2711,14 +2711,14 @@ bool _sub_6CA2DF(sint32 *_trackType, sint32 *_trackDirection, sint32 *_rideIndex
     }
 
 
-    if (_trackType != NULL) *_trackType = trackType;
-    if (_trackDirection != NULL) *_trackDirection = trackDirection;
-    if (_rideIndex != NULL) *_rideIndex = rideIndex;
-    if (_liftHillAndAlternativeState != NULL) *_liftHillAndAlternativeState = liftHillAndAlternativeState;
-    if (_x != NULL) *_x = x;
-    if (_y != NULL) *_y = y;
-    if (_z != NULL) *_z = z;
-    if (_properties != NULL) *_properties = properties;
+    if (_trackType != nullptr) *_trackType = trackType;
+    if (_trackDirection != nullptr) *_trackDirection = trackDirection;
+    if (_rideIndex != nullptr) *_rideIndex = rideIndex;
+    if (_liftHillAndAlternativeState != nullptr) *_liftHillAndAlternativeState = liftHillAndAlternativeState;
+    if (_x != nullptr) *_x = x;
+    if (_y != nullptr) *_y = y;
+    if (_z != nullptr) *_z = z;
+    if (_properties != nullptr) *_properties = properties;
 
     return false;
 }
@@ -2732,7 +2732,7 @@ static void window_ride_construction_update_enabled_track_pieces()
     rct_ride *ride = get_ride(_currentRideIndex);
     rct_ride_entry *rideEntry = get_ride_entry_by_ride(ride);
 
-    if (rideEntry == NULL)
+    if (rideEntry == nullptr)
         return;
 
     sint32 rideType = (_currentTrackAlternative & RIDE_TYPE_ALTERNATIVE_TRACK_TYPE) ? RideData4[ride->type].alternate_type : ride->type;
@@ -2823,7 +2823,7 @@ void sub_6C94D8()
     case RIDE_CONSTRUCTION_STATE_FRONT:
     case RIDE_CONSTRUCTION_STATE_BACK:
         if (!(_currentTrackSelectionFlags & TRACK_SELECTION_FLAG_TRACK)) {
-            if (_sub_6CA2DF(&type, &direction, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, NULL)) {
+            if (_sub_6CA2DF(&type, &direction, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, nullptr)) {
                 ride_construction_remove_ghosts();
             } else {
                 _currentTrackPrice = _place_provisional_track_piece(rideIndex, type, direction, liftHillAndAlternativeState, x, y, z);
@@ -2866,7 +2866,7 @@ void sub_6C94D8()
         z = _currentTrackBeginZ;
         direction = _currentTrackPieceDirection & 3;
         type = _currentTrackPieceType;
-        if (sub_6C683D(&x, &y, &z, direction, type, 0, NULL, _currentTrackSelectionFlags & TRACK_SELECTION_FLAG_ARROW ? 2 : 1)) {
+        if (sub_6C683D(&x, &y, &z, direction, type, 0, nullptr, _currentTrackSelectionFlags & TRACK_SELECTION_FLAG_ARROW ? 2 : 1)) {
             ride_construction_remove_ghosts();
             _rideConstructionState = RIDE_CONSTRUCTION_STATE_0;
         }
@@ -2930,7 +2930,7 @@ static void window_ride_construction_update_map_selection()
         y = _currentTrackBeginY;
         break;
     default:
-        if (_sub_6CA2DF(&trackType, &trackDirection, NULL, NULL, &x, &y, NULL, NULL)) {
+        if (_sub_6CA2DF(&trackType, &trackDirection, nullptr, nullptr, &x, &y, nullptr, nullptr)) {
             trackDirection = _currentTrackPieceDirection;
             trackType = 0;
             x = _currentTrackBeginX;
@@ -3601,7 +3601,7 @@ static void ride_selected_track_set_seat_rotation(sint32 seatRotation)
     x = _currentTrackBeginX;
     y = _currentTrackBeginY;
     z = _currentTrackBeginZ;
-    sub_6C683D(&x, &y, &z, _currentTrackPieceDirection & 3, _currentTrackPieceType, seatRotation, NULL, (1 << 5));
+    sub_6C683D(&x, &y, &z, _currentTrackPieceDirection & 3, _currentTrackPieceType, seatRotation, nullptr, (1 << 5));
     window_ride_construction_update_active_elements();
 }
 
@@ -3684,7 +3684,7 @@ void ride_construction_toolupdate_construct(sint32 screenX, sint32 screenY)
     gMapSelectionTiles[1].y = -1;
 
     sint32 trackType, trackDirection, rideIndex, liftHillAndAlternativeState;
-    if (_sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, NULL, NULL, NULL, NULL)) {
+    if (_sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, nullptr, nullptr, nullptr, nullptr)) {
         ride_construction_invalidate_current_track();
         map_invalidate_map_selection_tiles();
         return;
@@ -3744,7 +3744,7 @@ void ride_construction_toolupdate_construct(sint32 screenX, sint32 screenY)
     _previousTrackPieceZ = z;
     if (ride->type == RIDE_TYPE_MAZE) {
         for (;;) {
-            _sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, NULL);
+            _sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, nullptr);
             _currentTrackPrice = _place_provisional_track_piece(rideIndex, trackType, trackDirection, liftHillAndAlternativeState, x, y, z);
             if (_currentTrackPrice != MONEY32_UNDEFINED)
                 break;
@@ -3767,7 +3767,7 @@ void ride_construction_toolupdate_construct(sint32 screenX, sint32 screenY)
     }
 
     for (;;) {
-        _sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, NULL);
+        _sub_6CA2DF(&trackType, &trackDirection, &rideIndex, &liftHillAndAlternativeState, &x, &y, &z, nullptr);
         _currentTrackPrice = _place_provisional_track_piece(rideIndex, trackType, trackDirection, liftHillAndAlternativeState, x, y, z);
         if (_currentTrackPrice != MONEY32_UNDEFINED)
             break;
@@ -3910,7 +3910,7 @@ void ride_construction_tooldown_construct(sint32 screenX, sint32 screenY)
             _rideConstructionArrowPulseTime = 0;
             window_maze_construction_update_pressed_widgets();
             w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-            if (w == NULL)
+            if (w == nullptr)
                 break;
 
             gDisableErrorWindowSound = true;
@@ -3942,7 +3942,7 @@ void ride_construction_tooldown_construct(sint32 screenX, sint32 screenY)
                     ) {
                     audio_play_sound(SOUND_ERROR, 0, state->x);
                     w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-                    if (w != NULL){
+                    if (w != nullptr){
                         tool_set(w, WIDX_CONSTRUCT, TOOL_CROSSHAIR);
                         input_set_flag(INPUT_FLAG_6, true);
                         _trackPlaceCtrlState = false;
@@ -3973,7 +3973,7 @@ void ride_construction_tooldown_construct(sint32 screenX, sint32 screenY)
         _rideConstructionArrowPulseTime = 0;
         window_ride_construction_update_active_elements();
         w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-        if (w == NULL)
+        if (w == nullptr)
             break;
 
         gDisableErrorWindowSound = true;
@@ -4021,7 +4021,7 @@ void ride_construction_tooldown_construct(sint32 screenX, sint32 screenY)
             window_close_by_class(WC_ERROR);
             if (_rideConstructionState == RIDE_CONSTRUCTION_STATE_0) {
                 w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-                if (w != NULL) {
+                if (w != nullptr) {
                     if (ride_are_all_possible_entrances_and_exits_built(ride)) {
                         // Clients don't necessarily have any ride built at this point
                         if (network_get_mode() != NETWORK_MODE_CLIENT) {
@@ -4094,7 +4094,7 @@ void game_command_callback_place_ride_entrance_or_exit(sint32 eax, sint32 ebx, s
 void window_ride_construction_do_station_check()
 {
     rct_ride *ride = get_ride(_currentRideIndex);
-    if (ride != NULL) {
+    if (ride != nullptr) {
         _stationConstructed = ride->num_stations != 0;
     }
 }
@@ -4104,13 +4104,13 @@ void window_ride_construction_do_entrance_exit_check()
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
     rct_ride *ride = get_ride(_currentRideIndex);
 
-    if (w == NULL || ride == NULL) {
+    if (w == nullptr || ride == nullptr) {
         return;
     }
 
     if (_rideConstructionState == RIDE_CONSTRUCTION_STATE_0) {
         w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-        if (w != NULL) {
+        if (w != nullptr) {
             if (!ride_are_all_possible_entrances_and_exits_built(ride)) {
                 window_event_mouse_up_call(w, WIDX_ENTRANCE);
             } else {
@@ -4123,7 +4123,7 @@ void window_ride_construction_do_entrance_exit_check()
 void window_ride_construction_keyboard_shortcut_turn_left()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4246,7 +4246,7 @@ void window_ride_construction_keyboard_shortcut_turn_left()
 void window_ride_construction_keyboard_shortcut_turn_right()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4369,7 +4369,7 @@ void window_ride_construction_keyboard_shortcut_turn_right()
 void window_ride_construction_keyboard_shortcut_use_track_default()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4393,7 +4393,7 @@ void window_ride_construction_keyboard_shortcut_use_track_default()
 void window_ride_construction_keyboard_shortcut_slope_down()
 {
     rct_window * w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4444,7 +4444,7 @@ void window_ride_construction_keyboard_shortcut_slope_down()
 void window_ride_construction_keyboard_shortcut_slope_up()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_STRAIGHT) || w->widgets[WIDX_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4495,7 +4495,7 @@ void window_ride_construction_keyboard_shortcut_slope_up()
 void window_ride_construction_keyboard_shortcut_chain_lift_toggle()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_CHAIN_LIFT) || w->widgets[WIDX_CHAIN_LIFT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_CHAIN_LIFT) || w->widgets[WIDX_CHAIN_LIFT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4505,7 +4505,7 @@ void window_ride_construction_keyboard_shortcut_chain_lift_toggle()
 void window_ride_construction_keyboard_shortcut_bank_left()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_BANK_STRAIGHT) || w->widgets[WIDX_BANK_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_BANK_STRAIGHT) || w->widgets[WIDX_BANK_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4532,7 +4532,7 @@ void window_ride_construction_keyboard_shortcut_bank_left()
 void window_ride_construction_keyboard_shortcut_bank_right()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_BANK_STRAIGHT) || w->widgets[WIDX_BANK_STRAIGHT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_BANK_STRAIGHT) || w->widgets[WIDX_BANK_STRAIGHT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4559,7 +4559,7 @@ void window_ride_construction_keyboard_shortcut_bank_right()
 void window_ride_construction_keyboard_shortcut_previous_track()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_PREVIOUS_SECTION) || w->widgets[WIDX_PREVIOUS_SECTION].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_PREVIOUS_SECTION) || w->widgets[WIDX_PREVIOUS_SECTION].type == WWT_EMPTY) {
         return;
     }
 
@@ -4569,7 +4569,7 @@ void window_ride_construction_keyboard_shortcut_previous_track()
 void window_ride_construction_keyboard_shortcut_next_track()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_NEXT_SECTION) || w->widgets[WIDX_NEXT_SECTION].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_NEXT_SECTION) || w->widgets[WIDX_NEXT_SECTION].type == WWT_EMPTY) {
         return;
     }
 
@@ -4579,7 +4579,7 @@ void window_ride_construction_keyboard_shortcut_next_track()
 void window_ride_construction_keyboard_shortcut_build_current()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_CONSTRUCT) || w->widgets[WIDX_CONSTRUCT].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_CONSTRUCT) || w->widgets[WIDX_CONSTRUCT].type == WWT_EMPTY) {
         return;
     }
 
@@ -4589,7 +4589,7 @@ void window_ride_construction_keyboard_shortcut_build_current()
 void window_ride_construction_keyboard_shortcut_demolish_current()
 {
     rct_window *w = window_find_by_class(WC_RIDE_CONSTRUCTION);
-    if (w == NULL || widget_is_disabled(w, WIDX_DEMOLISH) || w->widgets[WIDX_DEMOLISH].type == WWT_EMPTY) {
+    if (w == nullptr || widget_is_disabled(w, WIDX_DEMOLISH) || w->widgets[WIDX_DEMOLISH].type == WWT_EMPTY) {
         return;
     }
 
diff --git a/src/openrct2/windows/RideList.cpp b/src/openrct2/windows/RideList.cpp
index 6738345dc8..8942609615 100644
--- a/src/openrct2/windows/RideList.cpp
+++ b/src/openrct2/windows/RideList.cpp
@@ -88,31 +88,31 @@ static void window_ride_list_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_ride_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list window_ride_list_events = {
-    NULL,
+    nullptr,
     window_ride_list_mouseup,
     window_ride_list_resize,
     window_ride_list_mousedown,
     window_ride_list_dropdown,
-    NULL,
+    nullptr,
     window_ride_list_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_list_scrollgetsize,
     window_ride_list_scrollmousedown,
-    NULL,
+    nullptr,
     window_ride_list_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_ride_list_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_ride_list_invalidate,
     window_ride_list_paint,
     window_ride_list_scrollpaint
@@ -201,7 +201,7 @@ void window_ride_list_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_RIDE_LIST);
-    if (window == NULL) {
+    if (window == nullptr) {
         window = window_create_auto_pos(340, 240, &window_ride_list_events, WC_RIDE_LIST, WF_10 | WF_RESIZABLE);
         window->widgets = window_ride_list_widgets;
         window->enabled_widgets =
diff --git a/src/openrct2/windows/Scenery.cpp b/src/openrct2/windows/Scenery.cpp
index e22b1471cd..228fe8fc3c 100644
--- a/src/openrct2/windows/Scenery.cpp
+++ b/src/openrct2/windows/Scenery.cpp
@@ -80,26 +80,26 @@ static rct_window_event_list window_scenery_events = {
     window_scenery_resize,
     window_scenery_mousedown,
     window_scenery_dropdown,
-    NULL,
+    nullptr,
     window_scenery_update,
     window_scenery_event_07,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_scenery_scrollgetsize,
     window_scenery_scrollmousedown,
-    NULL,
+    nullptr,
     window_scenery_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_scenery_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_scenery_invalidate,
     window_scenery_paint,
     window_scenery_scrollpaint,
@@ -416,7 +416,7 @@ void window_scenery_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_SCENERY);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     init_scenery();
@@ -902,7 +902,7 @@ void window_scenery_invalidate(rct_window *w)
     uint32 titleStringId = STR_MISCELLANEOUS;
     if (tabIndex < 19) {
         rct_scenery_set_entry * sgEntry = get_scenery_group_entry(tabIndex);
-        if (sgEntry != NULL && sgEntry != (rct_scenery_set_entry *)-1) {
+        if (sgEntry != nullptr && sgEntry != (rct_scenery_set_entry *)-1) {
             titleStringId = sgEntry->name;
         }
     }
@@ -960,7 +960,7 @@ void window_scenery_invalidate(rct_window *w)
         window_scenery_widgets[WIDX_SCENERY_TERTIARY_COLOUR_BUTTON].type = WWT_COLOURBTN;
         window_scenery_widgets[WIDX_SCENERY_ROTATE_OBJECTS_BUTTON].type = WWT_EMPTY;
     } else if (tabSelectedSceneryId != -1) {
-        rct_scenery_entry* sceneryEntry = NULL;
+        rct_scenery_entry* sceneryEntry = nullptr;
 
         if (tabSelectedSceneryId >= 0x400) {
             sceneryEntry = get_banner_entry(tabSelectedSceneryId - 0x400);
@@ -1059,7 +1059,7 @@ void window_scenery_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     uint32 price = 0;
 
-    rct_scenery_entry* sceneryEntry = NULL;
+    rct_scenery_entry* sceneryEntry = nullptr;
     if (selectedSceneryEntryId >= 0x400) {
         sceneryEntry = get_banner_entry(selectedSceneryEntryId - 0x400);
         price = sceneryEntry->banner.price;
@@ -1248,7 +1248,7 @@ bool window_scenery_set_selected_item(sint32 sceneryId)
 {
     bool result = false;
     rct_window * w = window_bring_to_front_by_class(WC_SCENERY);
-    if (w != NULL) {
+    if (w != nullptr) {
         sint32 tabIndex = window_scenery_find_tab_with_scenery_id(sceneryId);
         if (tabIndex != -1) {
             gWindowSceneryActiveTabIndex = tabIndex;
diff --git a/src/openrct2/windows/Sign.cpp b/src/openrct2/windows/Sign.cpp
index 01f1168ea4..59e6bcebe6 100644
--- a/src/openrct2/windows/Sign.cpp
+++ b/src/openrct2/windows/Sign.cpp
@@ -65,34 +65,34 @@ static void window_sign_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 // 0x98E44C
 static rct_window_event_list window_sign_events = {
-    NULL,
+    nullptr,
     window_sign_mouseup,
-    NULL,
+    nullptr,
     window_sign_mousedown,
     window_sign_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_sign_textinput,
     window_sign_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_sign_invalidate,
     window_sign_paint,
-    NULL
+    nullptr
 };
 
 static void window_sign_small_mouseup(rct_window *w, rct_widgetindex widgetIndex);
@@ -101,34 +101,34 @@ static void window_sign_small_invalidate(rct_window *w);
 
 // 0x9A410C
 static rct_window_event_list window_sign_small_events = {
-    NULL,
+    nullptr,
     window_sign_small_mouseup,
-    NULL,
+    nullptr,
     window_sign_mousedown,
     window_sign_small_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_sign_textinput,
     window_sign_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_sign_small_invalidate,
     window_sign_paint,
-    NULL
+    nullptr
 };
 
 /**
@@ -143,7 +143,7 @@ void window_sign_open(rct_windownumber number)
 
     // Check if window is already open
     w = window_bring_to_front_by_number(WC_BANNER, number);
-    if (w != NULL)
+    if (w != nullptr)
         return;
 
     w = window_create_auto_pos(WW, WH, &window_sign_events, WC_BANNER, WF_NO_SCROLLING);
@@ -309,7 +309,7 @@ static void window_sign_dropdown(rct_window *w, rct_widgetindex widgetIndex, sin
  */
 static void window_sign_textinput(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (widgetIndex == WIDX_SIGN_TEXT && text != NULL) {
+    if (widgetIndex == WIDX_SIGN_TEXT && text != nullptr) {
         game_do_command(1, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 0)), GAME_COMMAND_SET_SIGN_NAME, *((sint32*)(text + 8)), *((sint32*)(text + 4)));
         game_do_command(2, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 12)), GAME_COMMAND_SET_SIGN_NAME, *((sint32*)(text + 20)), *((sint32*)(text + 16)));
         game_do_command(0, GAME_COMMAND_FLAG_APPLY, w->number, *((sint32*)(text + 24)), GAME_COMMAND_SET_SIGN_NAME, *((sint32*)(text + 32)), *((sint32*)(text + 28)));
@@ -350,7 +350,7 @@ static void window_sign_paint(rct_window *w, rct_drawpixelinfo *dpi)
     window_draw_widgets(w, dpi);
 
     // Draw viewport
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         window_draw_viewport(dpi, w);
     }
 }
@@ -405,7 +405,7 @@ void window_sign_small_open(rct_windownumber number){
 
     // Check if window is already open
     w = window_bring_to_front_by_number(WC_BANNER, number);
-    if (w != NULL)
+    if (w != nullptr)
         return;
 
     w = window_create_auto_pos(WW, WH, &window_sign_small_events, WC_BANNER, 0);
diff --git a/src/openrct2/windows/Staff.cpp b/src/openrct2/windows/Staff.cpp
index a4a71b5410..de830f908a 100644
--- a/src/openrct2/windows/Staff.cpp
+++ b/src/openrct2/windows/Staff.cpp
@@ -167,93 +167,93 @@ static rct_window_event_list window_staff_overview_events = {
     window_staff_overview_resize,
     window_staff_overview_mousedown,
     window_staff_overview_dropdown,
-    NULL,
+    nullptr,
     window_staff_overview_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_staff_overview_tool_update,
     window_staff_overview_tool_down,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_staff_overview_tool_abort,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_overview_text_input,
     window_staff_overview_viewport_rotate,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_overview_invalidate, //Invalidate
     window_staff_overview_paint, //Paint
-    NULL
+    nullptr
 };
 
 // 0x992B5C
 static rct_window_event_list window_staff_options_events = {
-    NULL,
+    nullptr,
     window_staff_options_mouseup,
     window_staff_stats_resize,
     window_staff_options_mousedown,
     window_staff_options_dropdown,
     window_staff_unknown_05,
     window_staff_options_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_options_invalidate, //Invalidate
     window_staff_options_paint, //Paint
-    NULL
+    nullptr
 };
 
 // 0x992BCC
 static rct_window_event_list window_staff_stats_events = {
-    NULL,
+    nullptr,
     window_staff_stats_mouseup,
     window_staff_stats_resize,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_staff_unknown_05,
     window_staff_stats_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_stats_invalidate, //Invalidate
     window_staff_stats_paint, //Paint
-    NULL
+    nullptr
 };
 
 static rct_window_event_list *window_staff_page_events[] = {
@@ -298,7 +298,7 @@ static uint8 _availableCostumes[ENTERTAINER_COSTUME_COUNT];
 rct_window *window_staff_open(rct_peep* peep)
 {
     rct_window* w = window_bring_to_front_by_number(WC_PEEP, peep->sprite_index);
-    if (w == NULL) {
+    if (w == nullptr) {
         w = window_create_auto_pos(WW, WH, &window_staff_overview_events, WC_PEEP, WF_10 | WF_RESIZABLE);
 
         w->number = peep->sprite_index;
@@ -1101,7 +1101,7 @@ void window_staff_overview_tool_update(rct_window* w, rct_widgetindex widgetInde
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE;
 
     sint32 map_x, map_y;
-    footpath_get_coordinates_from_pos(x, y + 16, &map_x, &map_y, NULL, NULL);
+    footpath_get_coordinates_from_pos(x, y + 16, &map_x, &map_y, nullptr, nullptr);
     if (map_x != MAP_LOCATION_NULL) {
         gMapSelectFlags |= MAP_SELECT_FLAG_ENABLE;
         gMapSelectType = MAP_SELECT_TYPE_FULL;
@@ -1115,7 +1115,7 @@ void window_staff_overview_tool_update(rct_window* w, rct_widgetindex widgetInde
     gPickupPeepImage = UINT32_MAX;
 
     sint32 interactionType;
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_NONE, NULL, NULL, &interactionType, NULL, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_NONE, nullptr, nullptr, &interactionType, nullptr, nullptr);
     if (interactionType == VIEWPORT_INTERACTION_ITEM_NONE)
         return;
 
@@ -1147,7 +1147,7 @@ void window_staff_overview_tool_down(rct_window* w, rct_widgetindex widgetIndex,
     if (widgetIndex == WIDX_PICKUP) {
         sint32 dest_x, dest_y;
         rct_map_element* mapElement;
-        footpath_get_coordinates_from_pos(x, y + 16, &dest_x, &dest_y, NULL, &mapElement);
+        footpath_get_coordinates_from_pos(x, y + 16, &dest_x, &dest_y, nullptr, &mapElement);
 
         if (dest_x == MAP_LOCATION_NULL)
             return;
@@ -1157,7 +1157,7 @@ void window_staff_overview_tool_down(rct_window* w, rct_widgetindex widgetIndex,
     }
     else if (widgetIndex == WIDX_PATROL){
         sint32 dest_x, dest_y;
-        footpath_get_coordinates_from_pos(x, y, &dest_x, &dest_y, NULL, NULL);
+        footpath_get_coordinates_from_pos(x, y, &dest_x, &dest_y, nullptr, nullptr);
 
         if (dest_x == MAP_LOCATION_NULL) return;
 
@@ -1187,7 +1187,7 @@ void window_staff_overview_text_input(rct_window *w, rct_widgetindex widgetIndex
     if (widgetIndex != WIDX_RENAME)
         return;
 
-    if (text == NULL)
+    if (text == nullptr)
         return;
 
     gGameCommandErrorTitle = STR_STAFF_ERROR_CANT_NAME_STAFF_MEMBER;
diff --git a/src/openrct2/windows/StaffFirePrompt.cpp b/src/openrct2/windows/StaffFirePrompt.cpp
index c06984d2de..2c884b3f26 100644
--- a/src/openrct2/windows/StaffFirePrompt.cpp
+++ b/src/openrct2/windows/StaffFirePrompt.cpp
@@ -47,34 +47,34 @@ static void window_staff_fire_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 //0x9A3F7C
 static rct_window_event_list window_staff_fire_events = {
-    NULL,
+    nullptr,
     window_staff_fire_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_staff_fire_paint,
-    NULL
+    nullptr
 };
 /** Based off of rct2: 0x6C0A77 */
 void window_staff_fire_prompt_open(rct_peep* peep)
diff --git a/src/openrct2/windows/TextInput.cpp b/src/openrct2/windows/TextInput.cpp
index 8cb8050cf4..252c57c9f2 100644
--- a/src/openrct2/windows/TextInput.cpp
+++ b/src/openrct2/windows/TextInput.cpp
@@ -64,32 +64,32 @@ static void draw_ime_composition(rct_drawpixelinfo * dpi, int cursorX, int curso
 static rct_window_event_list window_text_input_events = {
     window_text_input_close,
     window_text_input_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_text_input_update7,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_text_input_invalidate,
     window_text_input_paint,
-    NULL
+    nullptr
 };
 
 rct_string_id input_text_description;
@@ -169,7 +169,7 @@ void window_text_input_raw_open(rct_window* call_w, rct_widgetindex call_widget,
 
     // Enter in the text input buffer any existing
     // text.
-    if (existing_text != NULL)
+    if (existing_text != nullptr)
         safe_strcpy(text_input, existing_text, maxLength);
 
     // In order to prevent strings that exceed the maxLength
@@ -233,15 +233,15 @@ static void window_text_input_mouseup(rct_window *w, rct_widgetindex widgetIndex
         context_stop_text_input();
         // Pass back the text that has been entered.
         // ecx when zero means text input failed
-        if (calling_w != NULL)
-            window_event_textinput_call(calling_w, calling_widget, NULL);
+        if (calling_w != nullptr)
+            window_event_textinput_call(calling_w, calling_widget, nullptr);
         window_close(w);
         break;
     case WIDX_OKAY:
         context_stop_text_input();
         // Pass back the text that has been entered.
         // ecx when none zero means text input success
-        if (calling_w != NULL)
+        if (calling_w != nullptr)
             window_event_textinput_call(calling_w, calling_widget, text_input);
         window_close(w);
     }
@@ -301,7 +301,7 @@ static void window_text_input_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 // Make a 1 utf8-character wide string for measuring the width
                 // of the currently selected character.
                 utf8 tmp[5] = { 0 }; // This is easier than setting temp_string[0..5]
-                uint32 codepoint = utf8_get_next(text_input + gTextInput->SelectionStart, NULL);
+                uint32 codepoint = utf8_get_next(text_input + gTextInput->SelectionStart, nullptr);
                 utf8_write_codepoint(tmp, codepoint);
                 width = Math::Max(gfx_get_string_width(tmp) - 2, 4);
             }
diff --git a/src/openrct2/windows/TileInspector.cpp b/src/openrct2/windows/TileInspector.cpp
index 1f13b6f934..3e11fd3151 100644
--- a/src/openrct2/windows/TileInspector.cpp
+++ b/src/openrct2/windows/TileInspector.cpp
@@ -477,31 +477,31 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static void window_tile_inspector_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);
 
 static rct_window_event_list TileInspectorWindowEvents = {
-    NULL,
+    nullptr,
     window_tile_inspector_mouseup,
     window_tile_inspector_resize,
     window_tile_inspector_mousedown,
     window_tile_inspector_dropdown,
-    NULL,
+    nullptr,
     window_tile_inspector_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_tile_inspector_tool_update,
     window_tile_inspector_tool_down,
     window_tile_inspector_tool_drag,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_tile_inspector_scrollgetsize,
     window_tile_inspector_scrollmousedown,
-    NULL,
+    nullptr,
     window_tile_inspector_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_tile_inspector_invalidate,
     window_tile_inspector_paint,
     window_tile_inspector_scrollpaint
@@ -539,7 +539,7 @@ void window_tile_inspector_open()
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_TILE_INSPECTOR);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     window = window_create(
@@ -1673,7 +1673,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Raise / lower label
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_SURFACE_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_SURFACE_SPINNER_HEIGHT].left + 3;
@@ -1683,7 +1683,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Raised corners
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_SURFACE_CHECK_CORNER_E].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_SURFACE_CORNERS, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_SURFACE_CORNERS, nullptr, COLOUR_DARK_GREEN, x, y);
             break;
         }
 
@@ -1700,13 +1700,13 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_PATH_ADDITIONS, &additionNameId, COLOUR_DARK_GREEN, x, y + 11);
             }
             else
-                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_PATH_ADDITIONS_NONE, NULL, COLOUR_DARK_GREEN, x, y + 11);
+                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_PATH_ADDITIONS_NONE, nullptr, COLOUR_DARK_GREEN, x, y + 11);
 
             // Properties
             // Raise / lower label
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_PATH_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_PATH_SPINNER_HEIGHT].left + 3;
@@ -1716,7 +1716,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Path connections
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_PATH_CHECK_EDGE_W].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_PATH_CONECTED_EDGES, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_PATH_CONECTED_EDGES, nullptr, COLOUR_DARK_GREEN, x, y);
             break;
         }
 
@@ -1740,7 +1740,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Properties
             // Raise / lower label
             y = w->y + w->widgets[WIDX_TRACK_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_TRACK_SPINNER_HEIGHT].left + 3;
@@ -1774,7 +1774,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Properties
             // Raise / Lower
             y = w->y + w->widgets[WIDX_SCENERY_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_SCENERY_SPINNER_HEIGHT].left + 3;
@@ -1784,11 +1784,11 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Quarter tile
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_SCENERY_CHECK_QUARTER_E].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_SCENERY_QUADRANT_LABEL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_SCENERY_QUADRANT_LABEL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Collision
             y = w->y + w->widgets[WIDX_SCENERY_CHECK_COLLISION_E].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_COLLISSION, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_COLLISSION, nullptr, COLOUR_DARK_GREEN, x, y);
             break;
         }
 
@@ -1832,7 +1832,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Properties
             // Raise / Lower
             y = w->y + w->widgets[WIDX_ENTRANCE_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_ENTRANCE_SPINNER_HEIGHT].left + 3;
@@ -1853,13 +1853,13 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_TEXT, &gBanners[mapElement->properties.wall.banner_index].string_idx, COLOUR_DARK_GREEN, x, y + 11);
             }
             else {
-                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_NONE, NULL, COLOUR_DARK_GREEN, x, y + 11);
+                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_NONE, nullptr, COLOUR_DARK_GREEN, x, y + 11);
             }
 
             // Properties
             // Raise / lower label
             y = w->y + w->widgets[WIDX_WALL_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_WALL_SPINNER_HEIGHT].left + 3;
@@ -1869,7 +1869,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Slope label
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
             y = w->y + w->widgets[WIDX_WALL_DROPDOWN_SLOPE].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_WALL_SLOPE, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_WALL_SLOPE, nullptr, COLOUR_DARK_GREEN, x, y);
             break;
         }
 
@@ -1894,13 +1894,13 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_TEXT, &gBanners[bannerIndex].string_idx, COLOUR_DARK_GREEN, x, y + 22);
             }
             else {
-                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_NONE, NULL, COLOUR_DARK_GREEN, x, y + 22);
+                gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_ENTRY_BANNER_NONE, nullptr, COLOUR_DARK_GREEN, x, y + 22);
             }
 
             // Properties
             // Raise / lower label
             y = w->y + w->widgets[WIDX_LARGE_SCENERY_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_LARGE_SCENERY_SPINNER_HEIGHT].left + 3;
@@ -1925,7 +1925,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Properties
             // Raise / lower label
             y = w->y + w->widgets[WIDX_BANNER_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_BANNER_SPINNER_HEIGHT].left + 3;
@@ -1935,7 +1935,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Blocked paths
             y += 28;
             x = w->x + w->widgets[WIDX_GROUPBOX_DETAILS].left + 7;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BANNER_BLOCKED_PATHS, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BANNER_BLOCKED_PATHS, nullptr, COLOUR_DARK_GREEN, x, y);
             break;
         }
 
@@ -1944,7 +1944,7 @@ static void window_tile_inspector_paint(rct_window *w, rct_drawpixelinfo *dpi)
             // Properties
             // Raise / lower label
             y = w->y + w->widgets[WIDX_CORRUPT_SPINNER_HEIGHT].top;
-            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, NULL, COLOUR_DARK_GREEN, x, y);
+            gfx_draw_string_left(dpi, STR_TILE_INSPECTOR_BASE_HEIGHT_FULL, nullptr, COLOUR_DARK_GREEN, x, y);
 
             // Current base height
             x = w->x + w->widgets[WIDX_CORRUPT_SPINNER_HEIGHT].left + 3;
diff --git a/src/openrct2/windows/TitleCommandEditor.cpp b/src/openrct2/windows/TitleCommandEditor.cpp
index 6b7ca032ad..64b20e6a27 100644
--- a/src/openrct2/windows/TitleCommandEditor.cpp
+++ b/src/openrct2/windows/TitleCommandEditor.cpp
@@ -79,7 +79,7 @@ static sint32 _window_title_command_editor_index;
 static char textbox1Buffer[BUF_SIZE];
 static char textbox2Buffer[BUF_SIZE];
 static TitleCommand command = { TITLE_SCRIPT_LOAD, { 0 } };
-static TitleSequence * _sequence = NULL;
+static TitleSequence * _sequence = nullptr;
 
 static rct_widget window_title_command_editor_widgets[] = {
     { WWT_FRAME,                1,  0,          WW-1,       0,      WH-1,   0xFFFFFFFF,                         STR_NONE },                         // panel / background
@@ -117,34 +117,34 @@ static rct_xy16 get_location();
 static uint8 get_zoom();
 
 static rct_window_event_list window_title_command_editor_events = {
-    NULL,
+    nullptr,
     window_title_command_editor_mouseup,
-    NULL,
+    nullptr,
     window_title_command_editor_mousedown,
     window_title_command_editor_dropdown,
-    NULL,
+    nullptr,
     window_title_command_editor_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_command_editor_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_command_editor_invalidate,
     window_title_command_editor_paint,
-    NULL
+    nullptr
 };
 
 static sint32 get_command_info_index(sint32 index)
@@ -169,11 +169,11 @@ static rct_xy16 get_location()
 {
     rct_xy16 mapCoord = { 0 };
     rct_window *w = window_get_main();
-    if (w != NULL) {
+    if (w != nullptr) {
         sint32 interactionType;
         rct_map_element *mapElement;
 
-        get_map_coordinates_from_pos(w->viewport->view_width / 2, w->viewport->view_height / 2, VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, NULL);
+        get_map_coordinates_from_pos(w->viewport->view_width / 2, w->viewport->view_height / 2, VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &mapElement, nullptr);
         mapCoord.x -= 16;
         mapCoord.x /= 32;
         mapCoord.y -= 16;
@@ -188,7 +188,7 @@ static uint8 get_zoom()
 {
     uint8 zoom = 0;
     rct_window *w = window_get_main();
-    if (w != NULL) {
+    if (w != nullptr) {
         zoom = w->viewport->zoom;
     }
     return zoom;
@@ -199,7 +199,7 @@ static void _window_title_command_editor_open(TitleSequence * sequence, sint32 i
     _sequence = sequence;
 
     // Check if window is already open
-    if (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != NULL)
+    if (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != nullptr)
         return;
 
     rct_window * window = window_create_centred(
@@ -304,7 +304,7 @@ static void window_title_command_editor_mouseup(rct_window *w, rct_widgetindex w
         TileSequenceSave(_sequence);
 
         rct_window *title_editor_w = window_find_by_class(WC_TITLE_EDITOR);
-        if (title_editor_w != NULL) {
+        if (title_editor_w != nullptr) {
             title_editor_w->selected_list_item = _window_title_command_editor_index;
         }
         window_close(w);
@@ -452,7 +452,7 @@ static void window_title_command_editor_textinput(rct_window * w, rct_widgetinde
     if (value > 255 && command.Type != TITLE_SCRIPT_WAIT) value = 255;
     switch (widgetIndex) {
     case WIDX_TEXTBOX_FULL:
-        if (text == NULL) {
+        if (text == nullptr) {
             if (*end == '\0') {
                 if (command.Type == TITLE_SCRIPT_WAIT) {
                     if (value < 100) value = 100;
@@ -474,7 +474,7 @@ static void window_title_command_editor_textinput(rct_window * w, rct_widgetinde
         }
         break;
     case WIDX_TEXTBOX_X:
-        if (text == NULL) {
+        if (text == nullptr) {
             if (*end == '\0') {
                 command.X = (uint8)value;
             }
@@ -485,7 +485,7 @@ static void window_title_command_editor_textinput(rct_window * w, rct_widgetinde
         }
         break;
     case WIDX_TEXTBOX_Y:
-        if (text == NULL) {
+        if (text == nullptr) {
             if (*end == '\0') {
                 command.Y = (uint8)value;
             }
@@ -550,13 +550,13 @@ static void window_title_command_editor_paint(rct_window *w, rct_drawpixelinfo *
 {
     window_draw_widgets(w, dpi);
 
-    gfx_draw_string_left(dpi, STR_TITLE_COMMAND_EDITOR_COMMAND_LABEL, NULL, w->colours[1], w->x + WS, w->y + BY - 14);
-    gfx_draw_string_left(dpi, get_command_info(command.Type).descStringId, NULL, w->colours[1], w->x + WS, w->y + BY2 - 14);
+    gfx_draw_string_left(dpi, STR_TITLE_COMMAND_EDITOR_COMMAND_LABEL, nullptr, w->colours[1], w->x + WS, w->y + BY - 14);
+    gfx_draw_string_left(dpi, get_command_info(command.Type).descStringId, nullptr, w->colours[1], w->x + WS, w->y + BY2 - 14);
 
     gfx_draw_string_left_clipped(
         dpi,
         get_command_info(command.Type).nameStringId,
-        NULL,
+        nullptr,
         w->colours[1],
         w->x + w->widgets[WIDX_COMMAND].left + 1,
         w->y + w->widgets[WIDX_COMMAND].top,
@@ -566,7 +566,7 @@ static void window_title_command_editor_paint(rct_window *w, rct_drawpixelinfo *
         gfx_draw_string_left_clipped(
             dpi,
             SpeedNames[command.Speed - 1],
-            NULL,
+            nullptr,
             w->colours[1],
             w->x + w->widgets[WIDX_INPUT].left + 1,
             w->y + w->widgets[WIDX_INPUT].top,
@@ -577,7 +577,7 @@ static void window_title_command_editor_paint(rct_window *w, rct_drawpixelinfo *
             gfx_draw_string_left_clipped(
                 dpi,
                 STR_TITLE_COMMAND_EDITOR_NO_SAVE_SELECTED,
-                NULL,
+                nullptr,
                 w->colours[1],
                 w->x + w->widgets[WIDX_INPUT].left + 1,
                 w->y + w->widgets[WIDX_INPUT].top,
diff --git a/src/openrct2/windows/TitleEditor.cpp b/src/openrct2/windows/TitleEditor.cpp
index e93d317d61..9a2f1a12d2 100644
--- a/src/openrct2/windows/TitleEditor.cpp
+++ b/src/openrct2/windows/TitleEditor.cpp
@@ -72,26 +72,26 @@ static rct_window_event_list window_title_editor_events = {
     window_title_editor_resize,
     window_title_editor_mousedown,
     window_title_editor_dropdown,
-    NULL,
+    nullptr,
     window_title_editor_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_title_editor_scrollgetsize,
     window_title_editor_scrollmousedown,
-    NULL,
+    nullptr,
     window_title_editor_scrollmouseover,
     window_title_editor_textinput,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_title_editor_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_title_editor_invalidate,
     window_title_editor_paint,
     window_title_editor_scrollpaint,
@@ -194,11 +194,11 @@ static rct_widget window_title_editor_widgets[] = {
 
 static size_t _selectedTitleSequence = 0;
 static bool _isSequenceReadOnly;
-static TitleSequence * _editingTitleSequence = NULL;
+static TitleSequence * _editingTitleSequence = nullptr;
 static bool _isSequencePlaying = false;
 static const utf8 * _sequenceName;
 
-static utf8 * _renameSavePath = NULL;
+static utf8 * _renameSavePath = nullptr;
 
 static sint16 _window_title_editor_highlighted_index;
 
@@ -224,7 +224,7 @@ static void _window_title_editor_open(sint32 tab)
 
     // Check if window is already open
     window = window_bring_to_front_by_class(WC_TITLE_EDITOR);
-    if (window != NULL)
+    if (window != nullptr)
         return;
 
     window = window_create_auto_pos(WW, WH2, &window_title_editor_events, WC_TITLE_EDITOR, WF_10 | WF_RESIZABLE);
@@ -286,16 +286,16 @@ static void window_title_editor_close(rct_window *w)
     window_close_by_class(WC_TITLE_COMMAND_EDITOR);
 
     FreeTitleSequence(_editingTitleSequence);
-    _editingTitleSequence = NULL;
+    _editingTitleSequence = nullptr;
     _isSequencePlaying = false;
-    _sequenceName = NULL;
+    _sequenceName = nullptr;
 
     SafeFree(_renameSavePath);
 }
 
 static void window_title_editor_mouseup(rct_window *w, rct_widgetindex widgetIndex)
 {
-    bool commandEditorOpen = (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != NULL);
+    bool commandEditorOpen = (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != nullptr);
     switch (widgetIndex) {
     case WIDX_TITLE_EDITOR_CLOSE:
         window_close(w);
@@ -311,7 +311,7 @@ static void window_title_editor_mouseup(rct_window *w, rct_widgetindex widgetInd
         }
         break;
     case WIDX_TITLE_EDITOR_DUPLICATE_BUTTON:
-        if (!commandEditorOpen && _editingTitleSequence != NULL) {
+        if (!commandEditorOpen && _editingTitleSequence != nullptr) {
             window_text_input_open(w, widgetIndex, STR_TITLE_EDITOR_ACTION_DUPLICATE, STR_TITLE_EDITOR_ENTER_NAME_FOR_SEQUENCE, STR_STRING, (uintptr_t)_editingTitleSequence->Name, 64);
         }
         break;
@@ -322,7 +322,7 @@ static void window_title_editor_mouseup(rct_window *w, rct_widgetindex widgetInd
         }
         break;
     case WIDX_TITLE_EDITOR_RENAME_SAVE_BUTTON:
-        if (window_title_editor_check_can_edit() && _editingTitleSequence != NULL) {
+        if (window_title_editor_check_can_edit() && _editingTitleSequence != nullptr) {
             window_text_input_open(w, widgetIndex, STR_TRACK_MANAGE_RENAME, STR_TITLE_EDITOR_ENTER_NAME_FOR_SEQUENCE, STR_STRING, (uintptr_t)_editingTitleSequence->Name, 64);
         }
         break;
@@ -332,7 +332,7 @@ static void window_title_editor_mouseup(rct_window *w, rct_widgetindex widgetInd
     //////////////////////////////////////////////////////////////////////////////////////////////////////
     case WIDX_TITLE_EDITOR_ADD_SAVE:
         if (!_isSequenceReadOnly && !_isSequencePlaying && !commandEditorOpen) {
-            window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_GAME, NULL);
+            window_loadsave_open(LOADSAVETYPE_LOAD | LOADSAVETYPE_GAME, nullptr);
             window_loadsave_set_loadsave_callback(window_title_editor_add_park_callback);
         }
         break;
@@ -500,7 +500,7 @@ static void window_title_editor_mousedown(rct_window *w, rct_widgetindex widgetI
         break;
     }
     case WIDX_TITLE_EDITOR_PRESETS_DROPDOWN:
-        if (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != NULL) {
+        if (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != nullptr) {
             window_error_open(STR_TITLE_EDITOR_ERR_CANT_CHANGE_WHILE_EDITOR_IS_OPEN, STR_NONE);
         } else {
             sint32 numItems = (sint32)title_sequence_manager_get_count();
@@ -765,7 +765,7 @@ static void window_title_editor_paint(rct_window *w, rct_drawpixelinfo *dpi)
     switch (w->selected_tab) {
     case WINDOW_TITLE_EDITOR_TAB_PRESETS:
         set_format_arg(0, uintptr_t, _sequenceName);
-        gfx_draw_string_left(dpi, STR_TITLE_SEQUENCE, NULL, w->colours[1], w->x + 10, w->y + window_title_editor_widgets[WIDX_TITLE_EDITOR_PRESETS].top + 1);
+        gfx_draw_string_left(dpi, STR_TITLE_SEQUENCE, nullptr, w->colours[1], w->x + 10, w->y + window_title_editor_widgets[WIDX_TITLE_EDITOR_PRESETS].top + 1);
         gfx_draw_string_left_clipped(
             dpi,
             STR_STRING,
@@ -804,7 +804,7 @@ static void window_title_editor_scrollpaint_saves(rct_window *w, rct_drawpixelin
 
     sint32 x = 0;
     sint32 y = 0;
-    if (_editingTitleSequence == NULL) {
+    if (_editingTitleSequence == nullptr) {
         return;
     }
     for (sint32 i = 0; i < (sint32)_editingTitleSequence->NumSaves; i++, y += ROW_HEIGHT) {
@@ -952,7 +952,7 @@ static void window_title_editor_load_sequence(size_t index)
 
     const char * path = title_sequence_manager_get_path(index);
     TitleSequence * titleSequence = LoadTitleSequence(path);
-    if (titleSequence == NULL) {
+    if (titleSequence == nullptr) {
         window_error_open(STR_FAILED_TO_LOAD_FILE_CONTAINS_INVALID_DATA, STR_NONE);
         return;
     }
@@ -974,7 +974,7 @@ static ITitleSequencePlayer * window_title_editor_get_player()
 
 static bool window_title_editor_check_can_edit()
 {
-    bool commandEditorOpen = (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != NULL);
+    bool commandEditorOpen = (window_find_by_class(WC_TITLE_COMMAND_EDITOR) != nullptr);
     if (_isSequenceReadOnly) {
         window_error_open(STR_ERROR_CANT_CHANGE_TITLE_SEQUENCE, STR_NONE);
     } else if (_isSequencePlaying) {
diff --git a/src/openrct2/windows/TitleScenarioSelect.cpp b/src/openrct2/windows/TitleScenarioSelect.cpp
index 914d5812a7..2f5c9e6b5b 100644
--- a/src/openrct2/windows/TitleScenarioSelect.cpp
+++ b/src/openrct2/windows/TitleScenarioSelect.cpp
@@ -51,7 +51,7 @@ typedef struct sc_list_item {
     };
 } sc_list_item;
 
-static sc_list_item *_listItems = NULL;
+static sc_list_item *_listItems = nullptr;
 
 enum {
     WIDX_BACKGROUND,
@@ -112,29 +112,29 @@ static void window_scenarioselect_scrollpaint(rct_window *w, rct_drawpixelinfo *
 static rct_window_event_list window_scenarioselect_events = {
     window_scenarioselect_close,
     window_scenarioselect_mouseup,
-    NULL,
+    nullptr,
     window_scenarioselect_mousedown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_scenarioselect_scrollgetsize,
     window_scenarioselect_scrollmousedown,
-    NULL,
+    nullptr,
     window_scenarioselect_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_scenarioselect_invalidate,
     window_scenarioselect_paint,
     window_scenarioselect_scrollpaint
@@ -160,7 +160,7 @@ static void _window_scenarioselect_open(scenarioselect_callback callback)
 
     _callback = callback;
 
-    if (window_bring_to_front_by_class(WC_SCENARIO_SELECT) != NULL)
+    if (window_bring_to_front_by_class(WC_SCENARIO_SELECT) != nullptr)
         return;
 
     // Load scenario list
@@ -190,7 +190,7 @@ static void _window_scenarioselect_open(scenarioselect_callback callback)
 
     window_init_scroll_widgets(window);
     window->viewport_focus_coordinates.var_480 = -1;
-    window->highlighted_scenario = NULL;
+    window->highlighted_scenario = nullptr;
 }
 
 /**
@@ -250,7 +250,7 @@ static void window_scenarioselect_mousedown(rct_window *w, rct_widgetindex widge
 {
     if (widgetIndex >= WIDX_TAB1 && widgetIndex <= WIDX_TAB8) {
         w->selected_tab = widgetIndex - 4;
-        w->highlighted_scenario = NULL;
+        w->highlighted_scenario = nullptr;
         initialise_list_items(w);
         window_invalidate(w);
         window_event_resize_call(w);
@@ -309,7 +309,7 @@ static void window_scenarioselect_scrollmouseover(rct_window *w, sint32 scrollIn
 {
     bool originalShowLockedInformation = _showLockedInformation;
     _showLockedInformation = false;
-    const scenario_index_entry *selected = NULL;
+    const scenario_index_entry *selected = nullptr;
     for (sc_list_item *listItem = _listItems; listItem->type != LIST_ITEM_TYPE_END; listItem++) {
         switch (listItem->type) {
         case LIST_ITEM_TYPE_HEADING:
@@ -391,14 +391,14 @@ static void window_scenarioselect_paint(rct_window *w, rct_drawpixelinfo *dpi)
 
     // Return if no scenario highlighted
     scenario = w->highlighted_scenario;
-    if (scenario == NULL) {
+    if (scenario == nullptr) {
         if (_showLockedInformation) {
             // Show locked information
             sint32 x = w->x + window_scenarioselect_widgets[WIDX_SCENARIOLIST].right + 4;
             sint32 y = w->y + window_scenarioselect_widgets[WIDX_TABCONTENT].top + 5;
-            gfx_draw_string_centred_clipped(dpi, STR_SCENARIO_LOCKED, NULL, COLOUR_BLACK, x + 85, y, 170);
+            gfx_draw_string_centred_clipped(dpi, STR_SCENARIO_LOCKED, nullptr, COLOUR_BLACK, x + 85, y, 170);
             y += 15;
-            y += gfx_draw_string_left_wrapped(dpi, NULL, x, y, 170, STR_SCENARIO_LOCKED_DESC, COLOUR_BLACK) + 5;
+            y += gfx_draw_string_left_wrapped(dpi, nullptr, x, y, 170, STR_SCENARIO_LOCKED_DESC, COLOUR_BLACK) + 5;
         }
         return;
     }
@@ -435,7 +435,7 @@ static void window_scenarioselect_paint(rct_window *w, rct_drawpixelinfo *dpi)
     y += gfx_draw_string_left_wrapped(dpi, gCommonFormatArgs, x, y, 170, STR_OBJECTIVE, COLOUR_BLACK) + 5;
 
     // Scenario score
-    if (scenario->highscore != NULL) {
+    if (scenario->highscore != nullptr) {
         // TODO: Should probably be translatable
         const utf8 *completedByName = "???";
         if (!str_is_null_or_empty(scenario->highscore->name)) {
@@ -486,7 +486,7 @@ static void window_scenarioselect_scrollpaint(rct_window *w, rct_drawpixelinfo *
                 gfx_filter_rect(dpi, 0, y, w->width, y + 23, PALETTE_DARKEN_1);
             }
 
-            bool isCompleted = scenario->highscore != NULL;
+            bool isCompleted = scenario->highscore != nullptr;
             bool isDisabled = listItem->scenario.is_locked;
 
             // Draw scenario name
@@ -533,11 +533,11 @@ static void draw_category_heading(rct_window *w, rct_drawpixelinfo *dpi, sint32
 
     // Draw string
     sint32 centreX = (left + right) / 2;
-    gfx_draw_string_centred(dpi, stringId, centreX, y, baseColour, NULL);
+    gfx_draw_string_centred(dpi, stringId, centreX, y, baseColour, nullptr);
 
     // Get string dimensions
     utf8 *buffer = gCommonStringFormatBuffer;
-    format_string(buffer, 256, stringId, NULL);
+    format_string(buffer, 256, stringId, nullptr);
     sint32 categoryStringHalfWidth = (gfx_get_string_width(buffer) / 2) + 4;
     sint32 strLeft = centreX - categoryStringHalfWidth;
     sint32 strRight = centreX + categoryStringHalfWidth;
@@ -626,7 +626,7 @@ static void initialise_list_items(rct_window *w)
         listItem->scenario.scenario = scenario;
         if (is_locking_enabled(w)) {
             listItem->scenario.is_locked = numUnlocks <= 0;
-            if (scenario->highscore == NULL) {
+            if (scenario->highscore == nullptr) {
                 numUnlocks--;
             } else {
                 // Mark RCT1 scenario as completed
diff --git a/src/openrct2/windows/Tooltip.cpp b/src/openrct2/windows/Tooltip.cpp
index e8c16ea243..17c2cc626b 100644
--- a/src/openrct2/windows/Tooltip.cpp
+++ b/src/openrct2/windows/Tooltip.cpp
@@ -38,34 +38,34 @@ static void window_tooltip_update(rct_window *w);
 static void window_tooltip_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_tooltip_events = {
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_tooltip_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_tooltip_paint,
-    NULL
+    nullptr
 };
 
 static utf8 _tooltipText[sizeof(gCommonStringFormatBuffer)];
@@ -87,7 +87,7 @@ static void _window_tooltip_show(rct_string_id id, sint32 x, sint32 y)
     sint32 width, height;
 
     w = window_find_by_class(WC_ERROR);
-    if (w != NULL)
+    if (w != nullptr)
         return;
 
     char* buffer = gCommonStringFormatBuffer;
@@ -150,7 +150,7 @@ static void _window_tooltip_open(rct_window *widgetWindow, rct_widgetindex widge
 {
     rct_widget *widget;
 
-    if (widgetWindow == NULL || widgetIndex == -1)
+    if (widgetWindow == nullptr || widgetIndex == -1)
         return;
 
     widget = &widgetWindow->widgets[widgetIndex];
diff --git a/src/openrct2/windows/TopToolbar.cpp b/src/openrct2/windows/TopToolbar.cpp
index 38f861308d..f5bcf1cd67 100644
--- a/src/openrct2/windows/TopToolbar.cpp
+++ b/src/openrct2/windows/TopToolbar.cpp
@@ -233,34 +233,34 @@ static void window_top_toolbar_invalidate(rct_window *w);
 static void window_top_toolbar_paint(rct_window *w, rct_drawpixelinfo *dpi);
 
 static rct_window_event_list window_top_toolbar_events = {
-    NULL,
+    nullptr,
     window_top_toolbar_mouseup,
-    NULL,
+    nullptr,
     window_top_toolbar_mousedown,
     window_top_toolbar_dropdown,
-    NULL,
-    NULL,
-    NULL,
-    NULL,                                           // check if editor versions are significantly different...
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,                                           // check if editor versions are significantly different...
     window_top_toolbar_tool_update,                 // editor: 0x0066fB0E
     window_top_toolbar_tool_down,                   // editor: 0x0066fB5C
     window_top_toolbar_tool_drag,                   // editor: 0x0066fB37
     window_top_toolbar_tool_up,                     // editor: 0x0066fC44 (Exactly the same)
     window_top_toolbar_tool_abort,                  // editor: 0x0066fA74 (Exactly the same)
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_top_toolbar_invalidate,
     window_top_toolbar_paint,
-    NULL
+    nullptr
 };
 
 static void top_toolbar_init_view_menu(rct_window *window, rct_widget *widget);
@@ -320,11 +320,11 @@ static void window_top_toolbar_mouseup(rct_window *w, rct_widgetindex widgetInde
         }
         break;
     case WIDX_ZOOM_OUT:
-        if ((mainWindow = window_get_main()) != NULL)
+        if ((mainWindow = window_get_main()) != nullptr)
             window_zoom_out(mainWindow, false);
         break;
     case WIDX_ZOOM_IN:
-        if ((mainWindow = window_get_main()) != NULL)
+        if ((mainWindow = window_get_main()) != nullptr)
             window_zoom_in(mainWindow, false);
         break;
     case WIDX_CLEAR_SCENERY:
@@ -427,7 +427,7 @@ static void window_top_toolbar_mousedown(rct_window *w, rct_widgetindex widgetIn
             numItems = 12;
 
         #ifndef DISABLE_TWITCH
-            if (gConfigTwitch.channel != NULL && gConfigTwitch.channel[0] != 0) {
+            if (gConfigTwitch.channel != nullptr && gConfigTwitch.channel[0] != 0) {
                 _menuDropdownIncludesTwitch = true;
                 gDropdownItemsFormat[12] = STR_EMPTY;
                 gDropdownItemsFormat[DDIDX_ENABLE_TWITCH] = STR_TOGGLE_OPTION;
@@ -787,7 +787,7 @@ static void window_top_toolbar_invalidate(rct_window *w)
     }
 
     // Footpath button pressed down
-    if (window_find_by_class(WC_FOOTPATH) == NULL)
+    if (window_find_by_class(WC_FOOTPATH) == nullptr)
         w->pressed_widgets &= ~(1 << WIDX_PATH);
     else
         w->pressed_widgets |= (1 << WIDX_PATH);
@@ -1042,7 +1042,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
     {
         sint32 entryIndex = mapElement->properties.scenery.type;
         rct_scenery_entry * sceneryEntry = get_small_scenery_entry(entryIndex);
-        if (sceneryEntry != NULL && sceneryEntry != (rct_scenery_entry *)-1) {
+        if (sceneryEntry != nullptr && sceneryEntry != (rct_scenery_entry *)-1) {
             sint32 sceneryId = get_scenery_id_from_entry_index(OBJECT_TYPE_SMALL_SCENERY, entryIndex);
             if (sceneryId != -1 && window_scenery_set_selected_item(sceneryId)) {
                 gWindowSceneryRotation = (get_current_rotation() + map_element_get_direction(mapElement)) & 3;
@@ -1057,7 +1057,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
     {
         sint32 entryIndex = mapElement->properties.wall.type;
         rct_scenery_entry * sceneryEntry = get_wall_entry(entryIndex);
-        if (sceneryEntry != NULL && sceneryEntry != (rct_scenery_entry *)-1) {
+        if (sceneryEntry != nullptr && sceneryEntry != (rct_scenery_entry *)-1) {
             sint32 sceneryId = get_scenery_id_from_entry_index(OBJECT_TYPE_WALLS, entryIndex);
             if (sceneryId != -1 && window_scenery_set_selected_item(sceneryId)) {
                 gWindowSceneryPrimaryColour = mapElement->properties.wall.colour_1 & 0x1F;
@@ -1072,7 +1072,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
     {
         sint32 entryIndex = mapElement->properties.scenerymultiple.type & MAP_ELEMENT_LARGE_TYPE_MASK;
         rct_scenery_entry * sceneryEntry = get_large_scenery_entry(entryIndex);
-        if (sceneryEntry != NULL && sceneryEntry != (rct_scenery_entry *)-1) {
+        if (sceneryEntry != nullptr && sceneryEntry != (rct_scenery_entry *)-1) {
             sint32 sceneryId = get_scenery_id_from_entry_index(OBJECT_TYPE_LARGE_SCENERY, entryIndex);
             if (sceneryId != -1 && window_scenery_set_selected_item(sceneryId)) {
                 gWindowSceneryRotation = (get_current_rotation() + map_element_get_direction(mapElement)) & 3;
@@ -1088,7 +1088,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
         sint32 bannerIndex = mapElement->properties.banner.index;
         rct_banner *banner = &gBanners[bannerIndex];
         rct_scenery_entry * sceneryEntry = get_banner_entry(banner->type);
-        if (sceneryEntry != NULL && sceneryEntry != (rct_scenery_entry *)-1) {
+        if (sceneryEntry != nullptr && sceneryEntry != (rct_scenery_entry *)-1) {
             sint32 sceneryId = get_scenery_id_from_entry_index(OBJECT_TYPE_BANNERS, banner->type);
             if (sceneryId != -1 && window_scenery_set_selected_item(sceneryId)) {
                 gWindowSceneryEyedropperEnabled = false;
@@ -1100,7 +1100,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
     {
         sint32 entryIndex = footpath_element_get_path_scenery_index(mapElement);
         rct_scenery_entry * sceneryEntry = get_footpath_item_entry(entryIndex);
-        if (sceneryEntry != NULL && sceneryEntry != (rct_scenery_entry *)-1) {
+        if (sceneryEntry != nullptr && sceneryEntry != (rct_scenery_entry *)-1) {
             sint32 sceneryId = get_scenery_id_from_entry_index(OBJECT_TYPE_PATH_BITS, entryIndex);
             if (sceneryId != -1 && window_scenery_set_selected_item(sceneryId)) {
                 gWindowSceneryEyedropperEnabled = false;
@@ -1124,7 +1124,7 @@ static void scenery_eyedropper_tool_down(sint16 x, sint16 y, rct_widgetindex wid
 static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid_x, sint16* grid_y, uint32* parameter_1, uint32* parameter_2, uint32* parameter_3){
     rct_window* w = window_find_by_class(WC_SCENERY);
 
-    if (w == NULL) {
+    if (w == nullptr) {
         *grid_x = MAP_LOCATION_NULL;
         return;
     }
@@ -1160,7 +1160,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
                     VIEWPORT_INTERACTION_MASK_WALL &
                     VIEWPORT_INTERACTION_MASK_LARGE_SCENERY;
                 sint32 interaction_type;
-                get_map_coordinates_from_pos(x, y, flags, NULL, NULL, &interaction_type, &map_element, NULL);
+                get_map_coordinates_from_pos(x, y, flags, nullptr, nullptr, &interaction_type, &map_element, nullptr);
 
                 if (interaction_type != VIEWPORT_INTERACTION_ITEM_NONE) {
                     gSceneryCtrlPressed = true;
@@ -1220,7 +1220,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
                 if (gSceneryShiftPressed) {
                     rct_map_element* map_element = map_get_surface_element_at(*grid_x / 32, *grid_y / 32);
 
-                    if (map_element == NULL) {
+                    if (map_element == nullptr) {
                         *grid_x = MAP_LOCATION_NULL;
                         return;
                     }
@@ -1275,7 +1275,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
             sint32 interaction_type = 0;
             rct_map_element* map_element;
 
-            get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, NULL);
+            get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, nullptr);
 
             if (interaction_type == VIEWPORT_INTERACTION_ITEM_NONE) {
                 *grid_x = MAP_LOCATION_NULL;
@@ -1292,7 +1292,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
             if (gSceneryShiftPressed) {
                 map_element = map_get_surface_element_at(*grid_x / 32, *grid_y / 32);
 
-                if (map_element == NULL) {
+                if (map_element == nullptr) {
                     *grid_x = MAP_LOCATION_NULL;
                     return;
                 }
@@ -1348,7 +1348,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
         sint32 interaction_type = 0;
         rct_map_element* map_element;
 
-        get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, NULL);
+        get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, nullptr);
 
         if (interaction_type == VIEWPORT_INTERACTION_ITEM_NONE) {
             *grid_x = MAP_LOCATION_NULL;
@@ -1380,7 +1380,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
             if (gSceneryShiftPressed) {
                 rct_map_element* map_element = map_get_surface_element_at(*grid_x / 32, *grid_y / 32);
 
-                if (map_element == NULL) {
+                if (map_element == nullptr) {
                     *grid_x = MAP_LOCATION_NULL;
                     return;
                 }
@@ -1422,7 +1422,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
         // Large scenery
         // If CTRL not pressed
         if (!gSceneryCtrlPressed) {
-            sub_68A15E(x, y, grid_x, grid_y, NULL, NULL);
+            sub_68A15E(x, y, grid_x, grid_y, nullptr, nullptr);
 
             if (*grid_x == MAP_LOCATION_NULL)
                 return;
@@ -1433,7 +1433,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
             if (gSceneryShiftPressed) {
                 rct_map_element* map_element = map_get_surface_element_at(*grid_x / 32, *grid_y / 32);
 
-                if (map_element == NULL) {
+                if (map_element == nullptr) {
                     *grid_x = MAP_LOCATION_NULL;
                     return;
                 }
@@ -1484,7 +1484,7 @@ static void sub_6E1F34(sint16 x, sint16 y, uint16 selected_scenery, sint16* grid
         sint32 interaction_type = 0;
         rct_map_element* map_element;
 
-        get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, NULL);
+        get_map_coordinates_from_pos(x, y, flags, grid_x, grid_y, &interaction_type, &map_element, nullptr);
 
         if (interaction_type == VIEWPORT_INTERACTION_ITEM_NONE) {
             *grid_x = MAP_LOCATION_NULL;
@@ -1745,7 +1745,7 @@ static void top_toolbar_tool_update_scenery_clear(sint16 x, sint16 y){
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE;
 
     rct_xy16 mapTile = { 0 };
-    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, NULL);
+    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, nullptr);
 
     if (mapTile.x == MAP_LOCATION_NULL) {
         if (gClearSceneryCost != MONEY32_UNDEFINED) {
@@ -1822,7 +1822,7 @@ static void top_toolbar_tool_update_land_paint(sint16 x, sint16 y){
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE;
 
     rct_xy16 mapTile = { 0 };
-    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, NULL);
+    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, nullptr);
 
     if (mapTile.x == MAP_LOCATION_NULL) {
         if (gClearSceneryCost != MONEY32_UNDEFINED) {
@@ -1974,7 +1974,7 @@ static void top_toolbar_tool_update_land(sint16 x, sint16 y){
         return;
     }
 
-    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, NULL);
+    screen_get_map_xy(x, y, &mapTile.x, &mapTile.y, nullptr);
 
     if (mapTile.x == MAP_LOCATION_NULL) {
         money32 lower_cost = MONEY32_UNDEFINED;
@@ -2095,8 +2095,8 @@ static void top_toolbar_tool_update_water(sint16 x, sint16 y){
         &mapTile.x,
         &mapTile.y,
         &interaction_type,
-        NULL,
-        NULL);
+        nullptr,
+        nullptr);
 
     if (interaction_type == VIEWPORT_INTERACTION_ITEM_NONE){
         if (gWaterToolRaiseCost != MONEY32_UNDEFINED || gWaterToolLowerCost != MONEY32_UNDEFINED) {
@@ -2844,7 +2844,7 @@ static void window_top_toolbar_tool_drag(rct_window* w, rct_widgetindex widgetIn
 {
     switch (widgetIndex){
     case WIDX_CLEAR_SCENERY:
-        if (window_find_by_class(WC_ERROR) != NULL)
+        if (window_find_by_class(WC_ERROR) != nullptr)
             break;
 
         if (!(gMapSelectFlags & MAP_SELECT_FLAG_ENABLE))
@@ -3057,7 +3057,7 @@ void top_toolbar_init_debug_menu(rct_window* w, rct_widget* widget)
         dropdown_set_disabled(DDIDX_INVENTIONS_LIST, true);
     }
 
-    dropdown_set_checked(DDIDX_DEBUG_PAINT, window_find_by_class(WC_DEBUG_PAINT) != NULL);
+    dropdown_set_checked(DDIDX_DEBUG_PAINT, window_find_by_class(WC_DEBUG_PAINT) != nullptr);
     gDropdownDefaultIndex = DDIDX_CONSOLE;
 }
 
@@ -3099,7 +3099,7 @@ void top_toolbar_debug_menu_dropdown(sint16 dropdownIndex)
             context_open_window(WC_EDITOR_SCENARIO_OPTIONS);
             break;
         case DDIDX_DEBUG_PAINT:
-            if (window_find_by_class(WC_DEBUG_PAINT) == NULL) {
+            if (window_find_by_class(WC_DEBUG_PAINT) == nullptr) {
                 context_open_window(WC_DEBUG_PAINT);
             } else {
                 window_close_by_class(WC_DEBUG_PAINT);
@@ -3257,7 +3257,7 @@ void top_toolbar_view_menu_dropdown(sint16 dropdownIndex)
  */
 void toggle_footpath_window()
 {
-    if (window_find_by_class(WC_FOOTPATH) == NULL) {
+    if (window_find_by_class(WC_FOOTPATH) == nullptr) {
         context_open_window(WC_FOOTPATH);
     } else {
         tool_cancel();
diff --git a/src/openrct2/windows/TrackList.cpp b/src/openrct2/windows/TrackList.cpp
index 6e5dbf59ee..0b2843af3d 100644
--- a/src/openrct2/windows/TrackList.cpp
+++ b/src/openrct2/windows/TrackList.cpp
@@ -71,29 +71,29 @@ static void window_track_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi,
 static rct_window_event_list window_track_list_events = {
     window_track_list_close,
     window_track_list_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_list_update,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_list_scrollgetsize,
     window_track_list_scrollmousedown,
-    NULL,
+    nullptr,
     window_track_list_scrollmouseover,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_list_tooltip,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_track_list_invalidate,
     window_track_list_paint,
     window_track_list_scrollpaint
@@ -103,7 +103,7 @@ static rct_window_event_list window_track_list_events = {
 
 ride_list_item _window_track_list_item;
 
-static track_design_file_ref *_trackDesigns = NULL;
+static track_design_file_ref *_trackDesigns = nullptr;
 static size_t _trackDesignsCount = 0;
 static uint16 _loadedTrackDesignIndex;
 static rct_track_td6 *_loadedTrackDesign;
@@ -157,7 +157,7 @@ static void _window_track_list_open(ride_list_item item)
 
     _trackDesignPreviewPixels = Memory::AllocateArray<uint8>(4 * TRACK_PREVIEW_IMAGE_SIZE);
 
-    _loadedTrackDesign = NULL;
+    _loadedTrackDesign = nullptr;
     _loadedTrackDesignIndex = TRACK_DESIGN_INDEX_UNLOADED;
 }
 
@@ -169,7 +169,7 @@ static void window_track_list_close(rct_window *w)
 {
     // Dispose track design and preview
     track_design_dispose(_loadedTrackDesign);
-    _loadedTrackDesign = NULL;
+    _loadedTrackDesign = nullptr;
     SafeFree(_trackDesignPreviewPixels);
 
     // Dispose track list
@@ -201,7 +201,7 @@ static void window_track_list_select(rct_window *w, sint32 index)
     w->track_list.var_480 = index;
 
     // Displays a message if the ride can't load, fix #4080
-    if (_loadedTrackDesign == NULL) {
+    if (_loadedTrackDesign == nullptr) {
         window_error_open(STR_CANT_BUILD_PARK_ENTRANCE_HERE, STR_TRACK_LOAD_FAILED_ERROR);
         return;
     }
@@ -217,7 +217,7 @@ static void window_track_list_select(rct_window *w, sint32 index)
     }
 
     rct_track_td6 *td6 = _loadedTrackDesign;
-    if (td6 != NULL && (td6->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE)) {
+    if (td6 != nullptr && (td6->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE)) {
         gTrackDesignSceneryToggle = true;
     }
 
@@ -348,7 +348,7 @@ static void window_track_list_invalidate(rct_window *w)
     rct_string_id stringId = STR_NONE;
     rct_ride_entry *entry = get_ride_entry(_window_track_list_item.entry_index);
 
-    if (entry != NULL && entry != (rct_ride_entry*)-1) {
+    if (entry != nullptr && entry != (rct_ride_entry*)-1) {
         rct_ride_name rideName = get_ride_naming(_window_track_list_item.type, entry);
         stringId = rideName.name;
     }
@@ -416,7 +416,7 @@ static void window_track_list_paint(rct_window *w, rct_drawpixelinfo *dpi)
     }
 
     rct_track_td6 *td6 = _loadedTrackDesign;
-    if (td6 == NULL) {
+    if (td6 == nullptr) {
         return;
     }
 
@@ -437,14 +437,14 @@ static void window_track_list_paint(rct_window *w, rct_drawpixelinfo *dpi)
     // Warnings
     if ((td6->track_flags & TRACK_DESIGN_FLAG_VEHICLE_UNAVAILABLE) && !(gScreenFlags & SCREEN_FLAGS_TRACK_MANAGER)) {
         // Vehicle design not available
-        gfx_draw_string_centred_clipped(dpi, STR_VEHICLE_DESIGN_UNAVAILABLE, NULL, COLOUR_BLACK, x, y, 368);
+        gfx_draw_string_centred_clipped(dpi, STR_VEHICLE_DESIGN_UNAVAILABLE, nullptr, COLOUR_BLACK, x, y, 368);
         y -= 10;
     }
 
     if (td6->track_flags & TRACK_DESIGN_FLAG_SCENERY_UNAVAILABLE) {
         if (!gTrackDesignSceneryToggle) {
             // Scenery not available
-            gfx_draw_string_centred_clipped(dpi, STR_DESIGN_INCLUDES_SCENERY_WHICH_IS_UNAVAILABLE, NULL, COLOUR_BLACK, x, y, 368);
+            gfx_draw_string_centred_clipped(dpi, STR_DESIGN_INCLUDES_SCENERY_WHICH_IS_UNAVAILABLE, nullptr, COLOUR_BLACK, x, y, 368);
             y -= 10;
         }
     }
@@ -572,7 +572,7 @@ static void window_track_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi,
     if (gScreenFlags & SCREEN_FLAGS_TRACK_MANAGER) {
         if (_trackDesignsCount == 0) {
             // No track designs
-            gfx_draw_string_left(dpi, STR_NO_TRACK_DESIGNS_OF_THIS_TYPE, NULL, COLOUR_BLACK, x, y - 1);
+            gfx_draw_string_left(dpi, STR_NO_TRACK_DESIGNS_OF_THIS_TYPE, nullptr, COLOUR_BLACK, x, y - 1);
             return;
         }
     } else {
@@ -616,7 +616,7 @@ static void track_list_load_designs(ride_list_item item)
 {
     if (!ride_type_has_ride_groups(item.type)) {
         char entry[9];
-        const char *entryPtr = NULL;
+        const char *entryPtr = nullptr;
         if (item.type < 0x80) {
             rct_ride_entry *rideEntry = get_ride_entry(item.entry_index);
             if ((rideEntry->flags & RIDE_ENTRY_FLAG_SEPARATE_RIDE) && !rideTypeShouldLoseSeparateFlag(rideEntry)) {
@@ -636,10 +636,10 @@ static bool track_list_load_design_for_preview(utf8 *path)
 {
     // Dispose currently loaded track
     track_design_dispose(_loadedTrackDesign);
-    _loadedTrackDesign = NULL;
+    _loadedTrackDesign = nullptr;
 
     _loadedTrackDesign = track_design_open(path);
-    if (_loadedTrackDesign != NULL && drawing_engine_get_type() != DRAWING_ENGINE_OPENGL) {
+    if (_loadedTrackDesign != nullptr && drawing_engine_get_type() != DRAWING_ENGINE_OPENGL) {
         track_design_draw_preview(_loadedTrackDesign, _trackDesignPreviewPixels);
         return true;
     }
diff --git a/src/openrct2/windows/TrackManage.cpp b/src/openrct2/windows/TrackManage.cpp
index 7624172d90..05a4d01cad 100644
--- a/src/openrct2/windows/TrackManage.cpp
+++ b/src/openrct2/windows/TrackManage.cpp
@@ -73,64 +73,64 @@ static void window_track_delete_prompt_paint(rct_window *w, rct_drawpixelinfo *d
 static rct_window_event_list window_track_manage_events = {
     window_track_manage_close,
     window_track_manage_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_manage_textinput,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_manage_paint,
-    NULL
+    nullptr
 };
 
 // 0x0099415C
 static rct_window_event_list window_track_delete_prompt_events = {
-    NULL,
+    nullptr,
     window_track_delete_prompt_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_delete_prompt_paint,
-    NULL
+    nullptr
 };
 
 #pragma endregion
@@ -163,7 +163,7 @@ static void _window_track_manage_open(track_design_file_ref *tdFileRef)
     window_init_scroll_widgets(w);
 
     rct_window *trackDesignListWindow = window_find_by_class(WC_TRACK_DESIGN_LIST);
-    if (trackDesignListWindow != NULL) {
+    if (trackDesignListWindow != nullptr) {
         trackDesignListWindow->track_list.var_484 |= 1;
     }
 
@@ -177,7 +177,7 @@ static void _window_track_manage_open(track_design_file_ref *tdFileRef)
 static void window_track_manage_close(rct_window *w)
 {
     rct_window *trackDesignListWindow = window_find_by_class(WC_TRACK_DESIGN_LIST);
-    if (trackDesignListWindow != NULL) {
+    if (trackDesignListWindow != nullptr) {
         trackDesignListWindow->track_list.var_484 &= ~1;
     }
 }
@@ -320,7 +320,7 @@ static void window_track_delete_prompt_paint(rct_window *w, rct_drawpixelinfo *d
 static void window_track_design_list_reload_tracks()
 {
     rct_window * trackListWindow = window_find_by_class(WC_TRACK_DESIGN_LIST);
-    if (trackListWindow != NULL) {
+    if (trackListWindow != nullptr) {
         trackListWindow->track_list.reload_track_designs = true;
     }
 }
diff --git a/src/openrct2/windows/TrackPlace.cpp b/src/openrct2/windows/TrackPlace.cpp
index 29c0234ff2..6f3be210e7 100644
--- a/src/openrct2/windows/TrackPlace.cpp
+++ b/src/openrct2/windows/TrackPlace.cpp
@@ -76,32 +76,32 @@ static void window_track_place_paint(rct_window *w, rct_drawpixelinfo *dpi);
 static rct_window_event_list window_track_place_events = {
     window_track_place_close,
     window_track_place_mouseup,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_place_update,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_track_place_toolupdate,
     window_track_place_tooldown,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
     window_track_place_toolabort,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_place_unknown14,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
     window_track_place_invalidate,
     window_track_place_paint,
-    NULL
+    nullptr
 };
 
 static uint8 *_window_track_place_mini_preview;
@@ -147,7 +147,7 @@ static void window_track_place_clear_mini_preview()
 static void _window_track_place_open(const track_design_file_ref *tdFileRef)
 {
     rct_track_td6 *td6 = track_design_open(tdFileRef->path);
-    if (td6 == NULL) {
+    if (td6 == nullptr) {
         return;
     }
 
@@ -198,7 +198,7 @@ static void window_track_place_close(rct_window *w)
     hide_gridlines();
     SafeFree(_window_track_place_mini_preview);
     track_design_dispose(_trackDesign);
-    _trackDesign = NULL;
+    _trackDesign = nullptr;
 }
 
 /**
@@ -257,7 +257,7 @@ static void window_track_place_toolupdate(rct_window* w, rct_widgetindex widgetI
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE_ARROW;
 
     // Get the tool map position
-    sub_68A15E(x, y, &mapX, &mapY, NULL, NULL);
+    sub_68A15E(x, y, &mapX, &mapY, nullptr, nullptr);
     if (mapX == MAP_LOCATION_NULL) {
         window_track_place_clear_provisional();
         return;
@@ -319,7 +319,7 @@ static void window_track_place_tooldown(rct_window* w, rct_widgetindex widgetInd
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE_CONSTRUCT;
     gMapSelectFlags &= ~MAP_SELECT_FLAG_ENABLE_ARROW;
 
-    sub_68A15E(x, y, &mapX, &mapY, NULL, NULL);
+    sub_68A15E(x, y, &mapX, &mapY, nullptr, nullptr);
     if (mapX == MAP_LOCATION_NULL)
         return;
 
@@ -441,10 +441,10 @@ static void window_track_place_attempt_placement(rct_track_td6 *td6, sint32 x, s
 
     gActiveTrackDesign = _trackDesign;
     result = game_do_command_p(GAME_COMMAND_PLACE_TRACK_DESIGN, &eax, &ebx, &ecx, &edx, &esi, &edi, &ebp);
-    gActiveTrackDesign = NULL;
+    gActiveTrackDesign = nullptr;
 
-    if (cost != NULL) *cost = result;
-    if (rideIndex != NULL) *rideIndex = edi & 0xFF;
+    if (cost != nullptr) *cost = result;
+    if (rideIndex != nullptr) *rideIndex = edi & 0xFF;
 }
 
 /**
diff --git a/src/openrct2/world/Entrance.cpp b/src/openrct2/world/Entrance.cpp
index 36c34acd00..e6250e73c4 100644
--- a/src/openrct2/world/Entrance.cpp
+++ b/src/openrct2/world/Entrance.cpp
@@ -112,7 +112,7 @@ static money32 ParkEntrancePlace(sint32 flags, sint16 x, sint16 y, uint8 z, uint
 
         // Check that entrance element does not already exist at this location
         rct_map_element* entranceElement = map_get_park_entrance_element_at(x, y, zLow, false);
-        if (entranceElement != NULL)
+        if (entranceElement != nullptr)
         {
             return MONEY32_UNDEFINED;
         }
@@ -129,7 +129,7 @@ static money32 ParkEntrancePlace(sint32 flags, sint16 x, sint16 y, uint8 z, uint
         }
 
         rct_map_element* newElement = map_element_insert(x / 32, y / 32, zLow, 0xF);
-        assert(newElement != NULL);
+        assert(newElement != nullptr);
         newElement->clearance_height = zHigh;
 
         if (flags & GAME_COMMAND_FLAG_GHOST)
@@ -165,7 +165,7 @@ static void ParkEntranceRemoveSegment(sint32 x, sint32 y, sint32 z)
     rct_map_element *mapElement;
 
     mapElement = map_get_park_entrance_element_at(x, y, z, true);
-    if (mapElement == NULL)
+    if (mapElement == nullptr)
     {
         return;
     }
@@ -407,7 +407,7 @@ static money32 RideEntranceExitPlace(sint16 x,
             network_set_player_last_action_coord(network_get_player_index(game_command_playerid), coord);
 
             rct_map_element* mapElement = map_element_insert(x / 32, y / 32, z / 8, 0xF);
-            assert(mapElement != NULL);
+            assert(mapElement != nullptr);
             mapElement->clearance_height = clear_z;
             mapElement->properties.entrance.type = isExit;
             mapElement->properties.entrance.index = stationNum << 4;
@@ -498,7 +498,7 @@ static money32 RideEntranceExitRemove(sint16 x, sint16 y, uint8 rideIndex, uint8
 
         bool found = false;
         rct_map_element* mapElement = map_get_first_element_at(x / 32, y / 32);
-        if (mapElement == NULL)
+        if (mapElement == nullptr)
         {
             log_warning("Invalid coordinates for entrance/exit removal x = %d, y = %d", x, y);
             return MONEY32_UNDEFINED;
diff --git a/src/openrct2/world/SmallScenery.cpp b/src/openrct2/world/SmallScenery.cpp
index f27e6b60e1..c6cf8ae213 100644
--- a/src/openrct2/world/SmallScenery.cpp
+++ b/src/openrct2/world/SmallScenery.cpp
@@ -137,7 +137,7 @@ static money32 SmallScenerySetColour(sint16 x, sint16 y, uint8 baseHeight, uint8
 
     rct_map_element *mapElement = map_get_small_scenery_element_at(x, y, baseHeight, sceneryType, quadrant);
 
-    if (mapElement == NULL)
+    if (mapElement == nullptr)
     {
         return 0;
     }
@@ -211,7 +211,7 @@ static money32 SmallSceneryPlace(sint16 x,
     }
 
     rct_scenery_entry* sceneryEntry = get_small_scenery_entry(sceneryType);
-    if (sceneryEntry == NULL)
+    if (sceneryEntry == nullptr)
     {
         return MONEY32_UNDEFINED;
     }
@@ -274,7 +274,7 @@ static money32 SmallSceneryPlace(sint16 x,
 
     rct_map_element* surfaceElement = map_get_surface_element_at(x / 32, y / 32);
 
-    if (surfaceElement != NULL && !gCheatsDisableClearanceChecks && map_get_water_height(surfaceElement) > 0)
+    if (surfaceElement != nullptr && !gCheatsDisableClearanceChecks && map_get_water_height(surfaceElement) > 0)
     {
         sint32 water_height = (map_get_water_height(surfaceElement) * 16) - 1;
         if (water_height > targetHeight)
@@ -292,7 +292,7 @@ static money32 SmallSceneryPlace(sint16 x,
             return MONEY32_UNDEFINED;
         }
 
-        if (surfaceElement != NULL && map_get_water_height(surfaceElement) > 0)
+        if (surfaceElement != nullptr && map_get_water_height(surfaceElement) > 0)
         {
             if ((map_get_water_height(surfaceElement) * 16) > targetHeight)
             {
@@ -306,7 +306,7 @@ static money32 SmallSceneryPlace(sint16 x,
         (sceneryEntry->small_scenery.flags & SMALL_SCENERY_FLAG_REQUIRE_FLAT_SURFACE) &&
         !supportsRequired &&
         !isOnWater &&
-        surfaceElement != NULL &&
+        surfaceElement != nullptr &&
         (surfaceElement->properties.surface.slope & 0x1F))
     {
 
@@ -321,7 +321,7 @@ static money32 SmallSceneryPlace(sint16 x,
 
         if (!isOnWater)
         {
-            if (surfaceElement != NULL)
+            if (surfaceElement != nullptr)
             {
                 if (map_get_water_height(surfaceElement) ||
                     (surfaceElement->base_height * 8) != targetHeight)
@@ -409,7 +409,7 @@ static money32 SmallSceneryPlace(sint16 x,
     }
 
     rct_map_element* newElement = map_element_insert(x / 32, y / 32, zLow, collisionQuadrants);
-    assert(newElement != NULL);
+    assert(newElement != nullptr);
     gSceneryMapElement = newElement;
     uint8 type = quadrant << 6;
     type |= MAP_ELEMENT_TYPE_SCENERY;