diff --git a/src/openrct2/drawing/Drawing.cpp b/src/openrct2/drawing/Drawing.cpp
index 1382b17c27..703029edad 100644
--- a/src/openrct2/drawing/Drawing.cpp
+++ b/src/openrct2/drawing/Drawing.cpp
@@ -475,7 +475,7 @@ const translucent_window_palette TranslucentWindowPalettes[COLOUR_COUNT] = {
 };
 
 void (*mask_fn)(sint32 width, sint32 height, const uint8 * RESTRICT maskSrc, const uint8 * RESTRICT colourSrc,
-                uint8 * RESTRICT dst, sint32 maskWrap, sint32 colourWrap, sint32 dstWrap) = NULL;
+                uint8 * RESTRICT dst, sint32 maskWrap, sint32 colourWrap, sint32 dstWrap) = nullptr;
 
 void mask_init()
 {
@@ -510,7 +510,7 @@ void gfx_filter_pixel(rct_drawpixelinfo *dpi, sint32 x, sint32 y, FILTER_PALETTE
 void gfx_transpose_palette(sint32 pal, uint8 product)
 {
     const rct_g1_element * g1 = gfx_get_g1_element(pal);
-    if (g1 != NULL)
+    if (g1 != nullptr)
     {
         sint32 width = g1->width;
         sint32 x = g1->x_offset;
@@ -542,13 +542,13 @@ void load_palette()
 
     uint32 palette = 0x5FC;
 
-    if (water_type != NULL) {
+    if (water_type != nullptr) {
         openrct2_assert(water_type->image_id != (uint32)-1, "Failed to load water palette");
         palette = water_type->image_id;
     }
 
     const rct_g1_element * g1 = gfx_get_g1_element(palette);
-    if (g1 != NULL)
+    if (g1 != nullptr)
     {
         sint32 width = g1->width;
         sint32 x = g1->x_offset;
@@ -640,7 +640,7 @@ void gfx_invalidate_pickedup_peep()
     if (sprite != UINT32_MAX)
     {
         const rct_g1_element * g1 = gfx_get_g1_element(sprite & 0x7FFFF);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             sint32 left = gPickupPeepX + g1->x_offset;
             sint32 top = gPickupPeepY + g1->y_offset;
diff --git a/src/openrct2/drawing/Font.cpp b/src/openrct2/drawing/Font.cpp
index 06a7c40c8e..c453f8f5a1 100644
--- a/src/openrct2/drawing/Font.cpp
+++ b/src/openrct2/drawing/Font.cpp
@@ -45,7 +45,7 @@ void font_sprite_initialise_characters()
         sint32 glyphOffset = fontSize * FONT_SPRITE_GLYPH_COUNT;
         for (uint8 glyphIndex = 0; glyphIndex < FONT_SPRITE_GLYPH_COUNT; glyphIndex++) {
             const rct_g1_element * g1 = gfx_get_g1_element(glyphIndex + SPR_CHAR_START + glyphOffset);
-            if (g1 != NULL)
+            if (g1 != nullptr)
             {
                 sint32 width = g1->width + 2 * g1->x_offset;
                 width += fontSize == FONT_SIZE_BIG ? 1 : -1;
@@ -250,7 +250,7 @@ bool font_supports_string_ttf(const utf8 *text, sint32 fontSize)
 #ifndef NO_TTF
     const utf8 *src = text;
     const TTF_Font *font = gCurrentTTFFontSet->size[fontSize].font;
-    if (font == NULL) {
+    if (font == nullptr) {
         return false;
     }
 
diff --git a/src/openrct2/drawing/LightFX.cpp b/src/openrct2/drawing/LightFX.cpp
index 4efae1c35f..6fa2ac6631 100644
--- a/src/openrct2/drawing/LightFX.cpp
+++ b/src/openrct2/drawing/LightFX.cpp
@@ -43,8 +43,8 @@ static uint8 _bakedLightTexture_spot_3[256 * 256];
 static rct_drawpixelinfo    _pixelInfo;
 static bool _lightfxAvailable = false;
 
-static void* _light_rendered_buffer_back = NULL;
-static void* _light_rendered_buffer_front = NULL;
+static void* _light_rendered_buffer_back = nullptr;
+static void* _light_rendered_buffer_front = nullptr;
 
 static uint32   _lightPolution_back = 0;
 static uint32   _lightPolution_front = 0;
@@ -279,12 +279,12 @@ void lightfx_prepare_light_list()
             for (sint32 pat = startSamplePoint; pat < totalSamplePoints; pat++) {
                 LocationXY16 mapCoord = { 0 };
 
-                rct_tile_element *tileElement = 0;
+                rct_tile_element *tileElement = nullptr;
 
                 sint32 interactionType = 0;
 
                 rct_window *w = window_get_main();
-                if (w != NULL) {
+                if (w != nullptr) {
                 //  get_map_coordinates_from_pos(entry->x + offsetPattern[pat*2] / mapFrontDiv, entry->y + offsetPattern[pat*2+1] / mapFrontDiv, VIEWPORT_INTERACTION_MASK_NONE, &mapCoord.x, &mapCoord.y, &interactionType, &tileElement, NULL);
 
 #ifdef LIGHTFX_UNKNOWN_PART_1
@@ -465,7 +465,7 @@ void lightfx_update_viewport_settings()
 
 void lightfx_render_lights_to_frontbuffer()
 {
-    if (_light_rendered_buffer_front == NULL) {
+    if (_light_rendered_buffer_front == nullptr) {
         return;
     }
 
@@ -476,7 +476,7 @@ void lightfx_render_lights_to_frontbuffer()
 //  log_warning("%i lights", LightListCurrentCountFront);
 
     for (uint32 light = 0; light < LightListCurrentCountFront; light++) {
-        const uint8 *bufReadBase    = 0;
+        const uint8 *bufReadBase    = nullptr;
         uint8       *bufWriteBase   = (uint8 *)_light_rendered_buffer_front;
         uint32      bufReadWidth, bufReadHeight;
         sint32      bufWriteX, bufWriteY;
@@ -990,7 +990,7 @@ void lightfx_render_to_texture(
     lightfx_render_lights_to_frontbuffer();
 
     uint8 * lightBits = (uint8 *)lightfx_get_front_buffer();
-    if (lightBits == NULL) {
+    if (lightBits == nullptr) {
         return;
     }
 
diff --git a/src/openrct2/drawing/ScrollingText.cpp b/src/openrct2/drawing/ScrollingText.cpp
index 4a4201d3c2..1d64073847 100644
--- a/src/openrct2/drawing/ScrollingText.cpp
+++ b/src/openrct2/drawing/ScrollingText.cpp
@@ -83,7 +83,7 @@ void scrolling_text_initialise_bitmaps()
     {
         sint32 imageId = SPR_SCROLLING_TEXT_START + i;
         const rct_g1_element * g1original = gfx_get_g1_element(imageId);
-        if (g1original != NULL)
+        if (g1original != nullptr)
         {
             rct_g1_element g1 = *g1original;
             g1.offset = _drawScrollTextList[i].bitmap;
@@ -1492,7 +1492,7 @@ static void scrolling_text_set_bitmap_for_sprite(utf8 *text, sint32 scroll, uint
         if (codepoint <= FORMAT_COLOUR_CODE_END && codepoint >= FORMAT_COLOUR_CODE_START){
             codepoint -= FORMAT_COLOUR_CODE_START;
             const rct_g1_element * g1 = gfx_get_g1_element(SPR_TEXT_PALETTE);
-            if (g1 != NULL)
+            if (g1 != nullptr)
             {
                 characterColour = g1->offset[codepoint * 4];
             }
@@ -1531,7 +1531,7 @@ static void scrolling_text_set_bitmap_for_ttf(utf8 *text, sint32 scroll, uint8 *
 {
 #ifndef NO_TTF
     TTFFontDescriptor *fontDesc = ttf_get_font_from_sprite_base(FONT_SPRITE_BASE_TINY);
-    if (fontDesc->font == NULL) {
+    if (fontDesc->font == nullptr) {
         scrolling_text_set_bitmap_for_sprite(text, scroll, bitmap, scrollPositionOffsets);
         return;
     }
@@ -1557,14 +1557,14 @@ static void scrolling_text_set_bitmap_for_ttf(utf8 *text, sint32 scroll, uint8 *
         colour = scrolling_text_get_colour(gCommonFormatArgs[7]);
     } else {
         const rct_g1_element * g1 = gfx_get_g1_element(SPR_TEXT_PALETTE);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             colour = g1->offset[(colour - FORMAT_COLOUR_CODE_START) * 4];
         }
     }
 
     TTFSurface * surface = ttf_surface_cache_get_or_add(fontDesc->font, text);
-    if (surface == NULL) {
+    if (surface == nullptr) {
         return;
     }
 
diff --git a/src/openrct2/drawing/String.cpp b/src/openrct2/drawing/String.cpp
index 09174d9634..7fbb986e37 100644
--- a/src/openrct2/drawing/String.cpp
+++ b/src/openrct2/drawing/String.cpp
@@ -151,7 +151,7 @@ sint32 gfx_wrap_string(utf8 *text, sint32 width, sint32 *outNumLines, sint32 *ou
     *outNumLines = 0;
 
     // Pointer to the start of the current word
-    utf8 *currentWord = NULL;
+    utf8 *currentWord = nullptr;
 
     // Width of line up to current word
     sint32 currentWidth = 0;
@@ -171,7 +171,7 @@ sint32 gfx_wrap_string(utf8 *text, sint32 width, sint32 *outNumLines, sint32 *ou
             maxWidth = std::max(maxWidth, lineWidth);
             (*outNumLines)++;
             lineWidth = 0;
-            currentWord = NULL;
+            currentWord = nullptr;
             firstCh = ch;
             numCharactersOnLine = 0;
             continue;
@@ -189,13 +189,13 @@ sint32 gfx_wrap_string(utf8 *text, sint32 width, sint32 *outNumLines, sint32 *ou
         if (lineWidth <= width || numCharactersOnLine == 0) {
             ch = nextCh;
             numCharactersOnLine++;
-        } else if (currentWord == NULL) {
+        } else if (currentWord == nullptr) {
             // Single word is longer than line, insert null terminator
             ch += utf8_insert_codepoint(ch, 0);
             maxWidth = std::max(maxWidth, lineWidth);
             (*outNumLines)++;
             lineWidth = 0;
-            currentWord = NULL;
+            currentWord = nullptr;
             firstCh = ch;
             numCharactersOnLine = 0;
         } else {
@@ -205,7 +205,7 @@ sint32 gfx_wrap_string(utf8 *text, sint32 width, sint32 *outNumLines, sint32 *ou
             maxWidth = std::max(maxWidth, currentWidth);
             (*outNumLines)++;
             lineWidth = 0;
-            currentWord = NULL;
+            currentWord = nullptr;
             firstCh = ch;
             numCharactersOnLine = 0;
         }
@@ -234,7 +234,7 @@ static void colour_char(uint8 colour, uint16* current_font_flags, uint8* palette
 
     sint32 colour32 = 0;
     const rct_g1_element * g1 = gfx_get_g1_element(SPR_TEXT_PALETTE);
-    if (g1 != NULL)
+    if (g1 != nullptr)
     {
         colour32 = ((uint32 *)g1->offset)[colour & 0xFF];
     }
@@ -291,7 +291,7 @@ void draw_string_centred_raw(rct_drawpixelinfo *dpi, sint32 x, sint32 y, sint32
         gfx_draw_string(dpi, text, TEXT_COLOUR_254, x - (width / 2), y);
 
         const utf8 *ch = text;
-        const utf8 *nextCh = 0;
+        const utf8 *nextCh = nullptr;
 
         while ((utf8_get_next(ch, &nextCh)) != 0) {
             ch = nextCh;
@@ -474,7 +474,7 @@ static void ttf_draw_string_raw_ttf(rct_drawpixelinfo *dpi, const utf8 *text, te
         return;
 
     TTFFontDescriptor *fontDesc = ttf_get_font_from_sprite_base(info->font_sprite_base);
-    if (fontDesc->font == NULL) {
+    if (fontDesc->font == nullptr) {
         ttf_draw_string_raw_sprite(dpi, text, info);
         return;
     }
@@ -485,7 +485,7 @@ static void ttf_draw_string_raw_ttf(rct_drawpixelinfo *dpi, const utf8 *text, te
     } else {
         uint8 colour = info->palette[1];
         TTFSurface * surface = ttf_surface_cache_get_or_add(fontDesc->font, text);
-        if (surface == NULL)
+        if (surface == nullptr)
             return;
 
         sint32 drawX = info->x + fontDesc->offset_x;
@@ -610,7 +610,7 @@ static const utf8 *ttf_process_format_code(rct_drawpixelinfo *dpi, const utf8 *t
     {
         uint16 eax = palette_to_g1_offset[(uint8)*nextCh++];
         const rct_g1_element * g1 = gfx_get_g1_element(eax);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             uint32 ebx = g1->offset[249] + 256;
             if (!(info->flags & TEXT_DRAW_FLAG_OUTLINE)) {
@@ -679,7 +679,7 @@ static const utf8 *ttf_process_format_code(rct_drawpixelinfo *dpi, const utf8 *t
     {
         uint32 imageId = *((uint32*)(nextCh));
         const rct_g1_element * g1 = gfx_get_g1_element(imageId & 0x7FFFF);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             if (!(info->flags & TEXT_DRAW_FLAG_NO_DRAW)) {
                 gfx_draw_sprite(dpi, imageId, info->x, info->y, 0);
@@ -812,7 +812,7 @@ static void ttf_process_initial_colour(sint32 colour, text_draw_info *info)
 
 void ttf_draw_string(rct_drawpixelinfo *dpi, char *text, sint32 colour, sint32 x, sint32 y)
 {
-    if (text == NULL) return;
+    if (text == nullptr) return;
 
     text_draw_info info;
     info.font_sprite_base = gCurrentFontSpriteBase;
@@ -855,7 +855,7 @@ static sint32 ttf_get_string_width(const utf8 *text)
         info.flags |= TEXT_DRAW_FLAG_TTF;
     }
 
-    ttf_process_string(NULL, text, &info);
+    ttf_process_string(nullptr, text, &info);
 
     return info.maxX;
 }
diff --git a/src/openrct2/drawing/TTF.cpp b/src/openrct2/drawing/TTF.cpp
index dc2f3ed28b..249e5e8315 100644
--- a/src/openrct2/drawing/TTF.cpp
+++ b/src/openrct2/drawing/TTF.cpp
@@ -49,7 +49,7 @@ typedef struct ttf_getwidth_cache_entry
     uint32      lastUseTick;
 } ttf_getwidth_cache_entry;
 
-static ttf_cache_entry _ttfSurfaceCache[TTF_SURFACE_CACHE_SIZE] = { 0 };
+static ttf_cache_entry _ttfSurfaceCache[TTF_SURFACE_CACHE_SIZE] = { nullptr };
 static sint32 _ttfSurfaceCacheCount = 0;
 static sint32 _ttfSurfaceCacheHitCount = 0;
 static sint32 _ttfSurfaceCacheMissCount = 0;
@@ -86,7 +86,7 @@ bool ttf_initialise()
             }
 
             fontDesc->font = ttf_open_font(fontPath, fontDesc->ptSize);
-            if (fontDesc->font == NULL) {
+            if (fontDesc->font == nullptr) {
                 log_verbose("Unable to load '%s'", fontPath);
                 return false;
             }
@@ -108,9 +108,9 @@ void ttf_dispose()
 
         for (sint32 i = 0; i < 4; i++) {
             TTFFontDescriptor *fontDesc = &(gCurrentTTFFontSet->size[i]);
-            if (fontDesc->font != NULL) {
+            if (fontDesc->font != nullptr) {
                 ttf_close_font(fontDesc->font);
-                fontDesc->font = NULL;
+                fontDesc->font = nullptr;
             }
         }
 
@@ -140,13 +140,13 @@ static uint32 ttf_surface_cache_hash(TTF_Font *font, const utf8 *text)
 
 static void ttf_surface_cache_dispose(ttf_cache_entry *entry)
 {
-    if (entry->surface != NULL) {
+    if (entry->surface != nullptr) {
         ttf_free_surface(entry->surface);
         free(entry->text);
 
-        entry->surface = NULL;
-        entry->font = NULL;
-        entry->text = NULL;
+        entry->surface = nullptr;
+        entry->font = nullptr;
+        entry->text = nullptr;
     }
 }
 
@@ -187,7 +187,7 @@ TTFSurface * ttf_surface_cache_get_or_add(TTF_Font * font, const utf8 * text)
         entry = &_ttfSurfaceCache[index];
 
         // Check if entry is a hit
-        if (entry->surface == NULL) break;
+        if (entry->surface == nullptr) break;
         if (entry->font == font && strcmp(entry->text, text) == 0) {
             _ttfSurfaceCacheHitCount++;
             entry->lastUseTick = gCurrentDrawCount;
@@ -208,8 +208,8 @@ TTFSurface * ttf_surface_cache_get_or_add(TTF_Font * font, const utf8 * text)
     ttf_surface_cache_dispose(entry);
 
     TTFSurface * surface = ttf_render(font, text);
-    if (surface == NULL) {
-        return NULL;
+    if (surface == nullptr) {
+        return nullptr;
     }
 
     _ttfSurfaceCacheMissCount++;
@@ -225,12 +225,12 @@ TTFSurface * ttf_surface_cache_get_or_add(TTF_Font * font, const utf8 * text)
 
 static void ttf_getwidth_cache_dispose(ttf_getwidth_cache_entry *entry)
 {
-    if (entry->text != NULL) {
+    if (entry->text != nullptr) {
         free(entry->text);
 
         entry->width = 0;
-        entry->font = NULL;
-        entry->text = NULL;
+        entry->font = nullptr;
+        entry->text = nullptr;
     }
 }
 
@@ -252,7 +252,7 @@ uint32 ttf_getwidth_cache_get_or_add(TTF_Font * font, const utf8 * text)
         entry = &_ttfGetWidthCache[index];
 
         // Check if entry is a hit
-        if (entry->text == NULL) break;
+        if (entry->text == nullptr) break;
         if (entry->font == font && strcmp(entry->text, text) == 0) {
             _ttfGetWidthCacheHitCount++;
             entry->lastUseTick = gCurrentDrawCount;
diff --git a/src/openrct2/interface/Colour.cpp b/src/openrct2/interface/Colour.cpp
index e573567376..e933d39af3 100644
--- a/src/openrct2/interface/Colour.cpp
+++ b/src/openrct2/interface/Colour.cpp
@@ -46,7 +46,7 @@ void colours_init_maps()
     for (sint32 i = 0; i < COLOUR_COUNT; i++)
     {
         const rct_g1_element * g1 = gfx_get_g1_element(SPR_PALETTE_2_START + i);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             ColourMapA[i].colour_0 = g1->offset[INDEX_COLOUR_0];
             ColourMapA[i].colour_1 = g1->offset[INDEX_COLOUR_1];
diff --git a/src/openrct2/interface/Console.cpp b/src/openrct2/interface/Console.cpp
index 53cef6e215..6b8f2ad6e9 100644
--- a/src/openrct2/interface/Console.cpp
+++ b/src/openrct2/interface/Console.cpp
@@ -146,9 +146,9 @@ void console_update()
     if (gConsoleOpen) {
         // When scrolling the map, the console pixels get copied... therefore invalidate the screen
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             rct_viewport *mainViewport = mainWindow->viewport;
-            if (mainViewport != NULL) {
+            if (mainViewport != nullptr) {
                 if (_lastMainViewportX != mainViewport->view_x || _lastMainViewportY != mainViewport->view_y) {
                     _lastMainViewportX = mainViewport->view_x;
                     _lastMainViewportY = mainViewport->view_y;
@@ -498,7 +498,7 @@ static sint32 cc_rides(const utf8 **argv, sint32 argc)
                     for (sint32 i = 0; i < RIDE_MODE_COUNT; i++) {
                         char mode_name[128] = { 0 };
                         rct_string_id mode_string_id = RideModeNames[i];
-                        format_string(mode_name, 128, mode_string_id, 0);
+                        format_string(mode_name, 128, mode_string_id, nullptr);
                         console_printf("%02d - %s", i, mode_name);
                     }
 
@@ -541,7 +541,7 @@ static sint32 cc_rides(const utf8 **argv, sint32 argc)
                     if (mode <= 0 || mode > (RIDE_MODE_COUNT - 1)) {
                         console_printf("Invalid ride mode.");
                     }
-                    else if (ride == NULL || ride->type == RIDE_TYPE_NULL) {
+                    else if (ride == nullptr || ride->type == RIDE_TYPE_NULL) {
                         console_printf("No ride found with index %d", ride_index);
                     }
                     else {
@@ -691,7 +691,7 @@ static sint32 cc_staff(const utf8 **argv, sint32 argc)
                 int_val[0] = console_parse_int(argv[2], &int_valid[0]);
                 int_val[1] = console_parse_int(argv[3], &int_valid[1]);
 
-                if (int_valid[0] && int_valid[1] && ((GET_PEEP(int_val[0])) != NULL)) {
+                if (int_valid[0] && int_valid[1] && ((GET_PEEP(int_val[0])) != nullptr)) {
                     rct_peep *peep = GET_PEEP(int_val[0]);
 
                     peep->energy = int_val[1];
@@ -702,13 +702,13 @@ static sint32 cc_staff(const utf8 **argv, sint32 argc)
                 bool int_valid[2] = { 0 };
                 int_val[0] = console_parse_int(argv[2], &int_valid[0]);
                 int_val[1] = console_parse_int(argv[3], &int_valid[1]);
-                rct_peep *peep = NULL;
+                rct_peep *peep = nullptr;
                 if (!int_valid[0]) {
                     console_writeline_error("Invalid staff ID");
                     return 1;
                 }
                 peep = GET_PEEP(int_val[0]);
-                bool is_entertainer = peep != NULL && peep->type == PEEP_TYPE_STAFF && peep->staff_type == STAFF_TYPE_ENTERTAINER;
+                bool is_entertainer = peep != nullptr && peep->type == PEEP_TYPE_STAFF && peep->staff_type == STAFF_TYPE_ENTERTAINER;
                 if (!is_entertainer) {
                     console_writeline_error("Specified staff is not entertainer");
                     return 1;
@@ -830,11 +830,11 @@ static sint32 cc_get(const utf8 **argv, sint32 argc)
         }
         else if (strcmp(argv[0], "location") == 0) {
             rct_window *w = window_get_main();
-            if (w != NULL) {
+            if (w != nullptr) {
                 sint32 interactionType;
                 rct_tile_element *tileElement;
                 LocationXY16 mapCoord = { 0 };
-                get_map_coordinates_from_pos(w->viewport->view_width / 2, w->viewport->view_height / 2, VIEWPORT_INTERACTION_MASK_TERRAIN, &mapCoord.x, &mapCoord.y, &interactionType, &tileElement, 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, &tileElement, nullptr);
                 mapCoord.x -= 16;
                 mapCoord.x /= 32;
                 mapCoord.y -= 16;
@@ -1036,7 +1036,7 @@ static sint32 cc_set(const utf8 **argv, sint32 argc)
         }
         else if (strcmp(argv[0], "location") == 0 && invalidArguments(&invalidArgs, int_valid[0] && int_valid[1])) {
             rct_window *w = window_get_main();
-            if (w != NULL) {
+            if (w != nullptr) {
                 sint32 x = (sint16)(int_val[0] * 32 + 16);
                 sint32 y = (sint16)(int_val[1] * 32 + 16);
                 sint32 z = tile_element_height(x, y);
@@ -1149,20 +1149,20 @@ static sint32 cc_load_object(const utf8 **argv, sint32 argc) {
         }
 
         const ObjectRepositoryItem * ori = object_repository_find_object_by_name(name);
-        if (ori == NULL) {
+        if (ori == nullptr) {
             console_writeline_error("Could not find the object.");
             return 1;
         }
 
         const rct_object_entry * entry = &ori->ObjectEntry;
         void * loadedObject = object_manager_get_loaded_object(entry);
-        if (loadedObject != NULL) {
+        if (loadedObject != nullptr) {
             console_writeline_error("Object is already in scenario.");
             return 1;
         }
 
         loadedObject = object_manager_load_object(entry);
-        if (loadedObject == NULL) {
+        if (loadedObject == nullptr) {
             console_writeline_error("Unable to load object.");
             return 1;
         }
@@ -1213,7 +1213,7 @@ static sint32 cc_object_count(const utf8 **argv, sint32 argc) {
 
         sint32 entryGroupIndex = 0;
         for (; entryGroupIndex < object_entry_group_counts[i]; entryGroupIndex++){
-            if (object_entry_groups[i].chunks[entryGroupIndex] == NULL){
+            if (object_entry_groups[i].chunks[entryGroupIndex] == nullptr){
                 break;
             }
         }
diff --git a/src/openrct2/interface/Viewport.cpp b/src/openrct2/interface/Viewport.cpp
index bd13c780dc..b3624e4f24 100644
--- a/src/openrct2/interface/Viewport.cpp
+++ b/src/openrct2/interface/Viewport.cpp
@@ -50,7 +50,7 @@ uint8 gShowConstuctionRightsRefCount;
 rct_viewport g_viewport_list[MAX_VIEWPORT_COUNT];
 rct_viewport *g_music_tracking_viewport;
 
-static rct_tile_element *_interaction_element = NULL;
+static rct_tile_element *_interaction_element = nullptr;
 
 sint16 gSavedViewX;
 sint16 gSavedViewY;
@@ -157,14 +157,14 @@ void centre_2d_coordinates(sint32 x, sint32 y, sint32 z, sint32 * out_x, sint32
 */
 void viewport_create(rct_window *w, sint32 x, sint32 y, sint32 width, sint32 height, sint32 zoom, sint32 centre_x, sint32 centre_y, sint32 centre_z, char flags, sint16 sprite)
 {
-    rct_viewport* viewport = NULL;
+    rct_viewport* viewport = nullptr;
     for (sint32 i = 0; i < MAX_VIEWPORT_COUNT; i++) {
         if (g_viewport_list[i].width == 0) {
             viewport = &g_viewport_list[i];
             break;
         }
     }
-    if (viewport == NULL) {
+    if (viewport == nullptr) {
         log_error("No more viewport slots left to allocate.");
         return;
     }
@@ -639,7 +639,7 @@ void viewport_update_sprite_follow(rct_window *window)
 void viewport_update_smart_sprite_follow(rct_window * window)
 {
     rct_sprite * sprite = try_get_sprite(window->viewport_smart_follow_sprite);
-    if (sprite == NULL)
+    if (sprite == nullptr)
     {
         window->viewport_smart_follow_sprite = SPRITE_INDEX_NULL;
         window->viewport_target_sprite = SPRITE_INDEX_NULL;
@@ -907,7 +907,7 @@ static void viewport_paint_column(rct_drawpixelinfo * dpi, uint32 viewFlags)
         viewport_paint_weather_gloom(dpi);
     }
 
-    if (session->PSStringHead != NULL) {
+    if (session->PSStringHead != nullptr) {
         paint_draw_money_structs(dpi, session->PSStringHead);
     }
 }
@@ -933,7 +933,7 @@ static void viewport_paint_weather_gloom(rct_drawpixelinfo * dpi)
  */
 void screen_pos_to_map_pos(sint16 *x, sint16 *y, sint32 *direction)
 {
-    screen_get_map_xy(*x, *y, x, y, NULL);
+    screen_get_map_xy(*x, *y, x, y, nullptr);
     if (*x == LOCATION_NULL)
         return;
 
@@ -963,7 +963,7 @@ void screen_pos_to_map_pos(sint16 *x, sint16 *y, sint32 *direction)
 
     *x = *x & ~0x1F;
     *y = *y & ~0x1F;
-    if (direction != NULL) *direction = my_direction;
+    if (direction != nullptr) *direction = my_direction;
 }
 
 LocationXY16 screen_coord_to_viewport_coord(rct_viewport *viewport, uint16 x, uint16 y)
@@ -1006,7 +1006,7 @@ void show_gridlines()
 {
     if (gShowGridLinesRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (!(mainWindow->viewport->flags & VIEWPORT_FLAG_GRIDLINES)) {
                 mainWindow->viewport->flags |= VIEWPORT_FLAG_GRIDLINES;
                 window_invalidate(mainWindow);
@@ -1025,7 +1025,7 @@ void hide_gridlines()
     gShowGridLinesRefCount--;
     if (gShowGridLinesRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (!gConfigGeneral.always_show_gridlines) {
                 mainWindow->viewport->flags &= ~VIEWPORT_FLAG_GRIDLINES;
                 window_invalidate(mainWindow);
@@ -1042,7 +1042,7 @@ void show_land_rights()
 {
     if (gShowLandRightsRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (!(mainWindow->viewport->flags & VIEWPORT_FLAG_LAND_OWNERSHIP)) {
                 mainWindow->viewport->flags |= VIEWPORT_FLAG_LAND_OWNERSHIP;
                 window_invalidate(mainWindow);
@@ -1061,7 +1061,7 @@ void hide_land_rights()
     gShowLandRightsRefCount--;
     if (gShowLandRightsRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (mainWindow->viewport->flags & VIEWPORT_FLAG_LAND_OWNERSHIP) {
                 mainWindow->viewport->flags &= ~VIEWPORT_FLAG_LAND_OWNERSHIP;
                 window_invalidate(mainWindow);
@@ -1078,7 +1078,7 @@ void show_construction_rights()
 {
     if (gShowConstuctionRightsRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (!(mainWindow->viewport->flags & VIEWPORT_FLAG_CONSTRUCTION_RIGHTS)) {
                 mainWindow->viewport->flags |= VIEWPORT_FLAG_CONSTRUCTION_RIGHTS;
                 window_invalidate(mainWindow);
@@ -1097,7 +1097,7 @@ void hide_construction_rights()
     gShowConstuctionRightsRefCount--;
     if (gShowConstuctionRightsRefCount == 0) {
         rct_window *mainWindow = window_get_main();
-        if (mainWindow != NULL) {
+        if (mainWindow != nullptr) {
             if (mainWindow->viewport->flags & VIEWPORT_FLAG_CONSTRUCTION_RIGHTS) {
                 mainWindow->viewport->flags &= ~VIEWPORT_FLAG_CONSTRUCTION_RIGHTS;
                 window_invalidate(mainWindow);
@@ -1114,7 +1114,7 @@ void viewport_set_visibility(uint8 mode)
 {
     rct_window* window = window_get_main();
 
-    if (window != NULL) {
+    if (window != nullptr) {
         rct_viewport* edi = window->viewport;
         uint32 invalidate = 0;
 
@@ -1281,7 +1281,7 @@ static bool is_pixel_present_rle(uint8 *esi, sint16 x_start_point, sint16 y_star
 static bool sub_679074(rct_drawpixelinfo *dpi, sint32 imageId, sint16 x, sint16 y, const uint8 * palette)
 {
     const rct_g1_element * g1 = gfx_get_g1_element(imageId & 0x7FFFF);
-    if (g1 == NULL)
+    if (g1 == nullptr)
     {
         return false;
     }
@@ -1442,7 +1442,7 @@ static bool sub_679074(rct_drawpixelinfo *dpi, sint32 imageId, sint16 x, sint16
  */
 static bool sub_679023(rct_drawpixelinfo *dpi, sint32 imageId, sint32 x, sint32 y)
 {
-    const uint8 * palette = NULL;
+    const uint8 * palette = nullptr;
     imageId &= 0xBFFFFFFF;
     if (imageId & IMAGE_TYPE_REMAP) {
         _currentImageType = IMAGE_TYPE_REMAP;
@@ -1452,7 +1452,7 @@ static bool sub_679023(rct_drawpixelinfo *dpi, sint32 imageId, sint32 x, sint32
         }
         sint32 g1Index = palette_to_g1_offset[index];
         const rct_g1_element * g1 = gfx_get_g1_element(g1Index);
-        if (g1 != NULL)
+        if (g1 != nullptr)
         {
             palette = g1->offset;
         }
@@ -1468,10 +1468,10 @@ static bool sub_679023(rct_drawpixelinfo *dpi, sint32 imageId, sint32 x, sint32
  */
 void sub_68862C(rct_drawpixelinfo * dpi, paint_struct * ps)
 {
-    while ((ps = ps->next_quadrant_ps) != NULL) {
+    while ((ps = ps->next_quadrant_ps) != nullptr) {
         paint_struct * old_ps = ps;
         paint_struct * next_ps = ps;
-        while (next_ps != NULL) {
+        while (next_ps != nullptr) {
             ps = next_ps;
             if (sub_679023(dpi, ps->image_id, ps->x, ps->y))
                 store_interaction_info(ps);
@@ -1479,7 +1479,7 @@ void sub_68862C(rct_drawpixelinfo * dpi, paint_struct * ps)
             next_ps = ps->var_20;
         }
 
-        for (attached_paint_struct *attached_ps = ps->attached_ps; attached_ps != NULL; attached_ps = attached_ps->next) {
+        for (attached_paint_struct *attached_ps = ps->attached_ps; attached_ps != nullptr; attached_ps = attached_ps->next) {
             if (sub_679023(
                 dpi,
                 attached_ps->image_id,
@@ -1517,7 +1517,7 @@ void get_map_coordinates_from_pos_window(rct_window * window, sint32 screenX, si
 {
     _unk9AC154 = flags & 0xFFFF;
     _interactionSpriteType = 0;
-    if (window != NULL && window->viewport != NULL)
+    if (window != nullptr && window->viewport != nullptr)
     {
         rct_viewport* myviewport = window->viewport;
         screenX -= (sint32)myviewport->x;
@@ -1546,12 +1546,12 @@ void get_map_coordinates_from_pos_window(rct_window * window, sint32 screenX, si
             sub_68862C(dpi, &ps);
             paint_session_free(session);
         }
-        if (viewport != NULL) *viewport = myviewport;
+        if (viewport != nullptr) *viewport = myviewport;
     }
-    if (interactionType != NULL) *interactionType = _interactionSpriteType;
-    if (x != NULL) *x = _interactionMapX;
-    if (y != NULL) *y = _interactionMapY;
-    if (tileElement != NULL) *tileElement = _interaction_element;
+    if (interactionType != nullptr) *interactionType = _interactionSpriteType;
+    if (x != nullptr) *x = _interactionMapX;
+    if (y != nullptr) *y = _interactionMapY;
+    if (tileElement != nullptr) *tileElement = _interaction_element;
 }
 
 /**
@@ -1564,7 +1564,7 @@ void viewport_invalidate(rct_viewport *viewport, sint32 left, sint32 top, sint32
     {
         for (rct_window *w = g_window_list; w < gWindowNextSlot; w++)
         {
-            if (w->classification != WC_MAIN_WINDOW && w->viewport != NULL && w->viewport == viewport)
+            if (w->classification != WC_MAIN_WINDOW && w->viewport != nullptr && w->viewport == viewport)
             {
                 // note, window_is_visible will update viewport->visibility, so this should have a low hit count
                 if (!window_is_visible(w)) {
@@ -1606,17 +1606,17 @@ void viewport_invalidate(rct_viewport *viewport, sint32 left, sint32 top, sint32
 static rct_viewport *viewport_find_from_point(sint32 screenX, sint32 screenY)
 {
     rct_window *w = window_find_from_point(screenX, screenY);
-    if (w == NULL)
-        return NULL;
+    if (w == nullptr)
+        return nullptr;
 
     rct_viewport *viewport = w->viewport;
-    if (viewport == NULL)
-        return NULL;
+    if (viewport == nullptr)
+        return nullptr;
 
     if (screenX < viewport->x || screenY < viewport->y)
-        return NULL;
+        return nullptr;
     if (screenX >= viewport->x + viewport->width || screenY >= viewport->y + viewport->height)
-        return NULL;
+        return nullptr;
 
     return viewport;
 }
@@ -1636,8 +1636,8 @@ static rct_viewport *viewport_find_from_point(sint32 screenX, sint32 screenY)
 void screen_get_map_xy(sint32 screenX, sint32 screenY, sint16 *x, sint16 *y, rct_viewport **viewport) {
     sint16 my_x, my_y;
     sint32 interactionType;
-    rct_viewport *myViewport = NULL;
-    get_map_coordinates_from_pos(screenX, screenY, VIEWPORT_INTERACTION_MASK_TERRAIN, &my_x, &my_y, &interactionType, NULL, &myViewport);
+    rct_viewport *myViewport = nullptr;
+    get_map_coordinates_from_pos(screenX, screenY, VIEWPORT_INTERACTION_MASK_TERRAIN, &my_x, &my_y, &interactionType, nullptr, &myViewport);
     if (interactionType == VIEWPORT_INTERACTION_ITEM_NONE) {
         *x = LOCATION_NULL;
         return;
@@ -1656,7 +1656,7 @@ void screen_get_map_xy(sint32 screenX, sint32 screenY, sint16 *x, sint16 *y, rct
     *x = map_pos.x;
     *y = map_pos.y;
 
-    if (viewport != NULL) *viewport = myViewport;
+    if (viewport != nullptr) *viewport = myViewport;
 }
 
 /**
@@ -1666,7 +1666,7 @@ void screen_get_map_xy(sint32 screenX, sint32 screenY, sint16 *x, sint16 *y, rct
 void screen_get_map_xy_with_z(sint16 screenX, sint16 screenY, sint16 z, sint16 *mapX, sint16 *mapY)
 {
     rct_viewport *viewport = viewport_find_from_point(screenX, screenY);
-    if (viewport == NULL) {
+    if (viewport == nullptr) {
         *mapX = LOCATION_NULL;
         return;
     }
@@ -1690,7 +1690,7 @@ void screen_get_map_xy_with_z(sint16 screenX, sint16 screenY, sint16 z, sint16 *
  */
 void screen_get_map_xy_quadrant(sint16 screenX, sint16 screenY, sint16 *mapX, sint16 *mapY, uint8 *quadrant)
 {
-    screen_get_map_xy(screenX, screenY, mapX, mapY, NULL);
+    screen_get_map_xy(screenX, screenY, mapX, mapY, nullptr);
     if (*mapX == LOCATION_NULL)
         return;
 
@@ -1720,7 +1720,7 @@ void screen_get_map_xy_quadrant_with_z(sint16 screenX, sint16 screenY, sint16 z,
  */
 void screen_get_map_xy_side(sint16 screenX, sint16 screenY, sint16 *mapX, sint16 *mapY, uint8 *side)
 {
-    screen_get_map_xy(screenX, screenY, mapX, mapY, NULL);
+    screen_get_map_xy(screenX, screenY, mapX, mapY, nullptr);
     if (*mapX == LOCATION_NULL)
         return;
 
@@ -1781,7 +1781,7 @@ sint16 get_height_marker_offset()
 void viewport_set_saved_view()
 {
     rct_window * w = window_get_main();
-    if (w != NULL) 
+    if (w != nullptr)
     {
         rct_viewport *viewport = w->viewport;
 
diff --git a/src/openrct2/interface/ViewportInteraction.cpp b/src/openrct2/interface/ViewportInteraction.cpp
index 8e0d7adbcb..254d3cbb22 100644
--- a/src/openrct2/interface/ViewportInteraction.cpp
+++ b/src/openrct2/interface/ViewportInteraction.cpp
@@ -64,7 +64,7 @@ sint32 viewport_interaction_get_item_left(sint32 x, sint32 y, viewport_interacti
         return info->type = VIEWPORT_INTERACTION_ITEM_NONE;
 
     LocationXY16 mapCoord = { 0 };
-    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_SPRITE & VIEWPORT_INTERACTION_MASK_RIDE & VIEWPORT_INTERACTION_MASK_PARK, &mapCoord.x, &mapCoord.y, &info->type, &info->tileElement, NULL);
+    get_map_coordinates_from_pos(x, y, VIEWPORT_INTERACTION_MASK_SPRITE & VIEWPORT_INTERACTION_MASK_RIDE & VIEWPORT_INTERACTION_MASK_PARK, &mapCoord.x, &mapCoord.y, &info->type, &info->tileElement, nullptr);
     info->x = mapCoord.x;
     info->y = mapCoord.y;
     tileElement = info->tileElement;
@@ -100,7 +100,7 @@ sint32 viewport_interaction_get_item_left(sint32 x, sint32 y, viewport_interacti
     // If nothing is under cursor, find a close by peep
     if (info->type == VIEWPORT_INTERACTION_ITEM_NONE) {
         info->peep = viewport_interaction_get_closest_peep(x, y, 32);
-        if (info->peep == NULL)
+        if (info->peep == nullptr)
             return VIEWPORT_INTERACTION_ITEM_NONE;
 
         info->type = VIEWPORT_INTERACTION_ITEM_SPRITE;
@@ -200,7 +200,7 @@ sint32 viewport_interaction_get_item_right(sint32 x, sint32 y, viewport_interact
         return info->type = VIEWPORT_INTERACTION_ITEM_NONE;
 
     LocationXY16 mapCoord = { 0 };
-    get_map_coordinates_from_pos(x, y, ~(VIEWPORT_INTERACTION_MASK_TERRAIN & VIEWPORT_INTERACTION_MASK_WATER), &mapCoord.x, &mapCoord.y, &info->type, &info->tileElement, NULL);
+    get_map_coordinates_from_pos(x, y, ~(VIEWPORT_INTERACTION_MASK_TERRAIN & VIEWPORT_INTERACTION_MASK_WATER), &mapCoord.x, &mapCoord.y, &info->type, &info->tileElement, nullptr);
     info->x = mapCoord.x;
     info->y = mapCoord.y;
     tileElement = info->tileElement;
@@ -305,7 +305,7 @@ sint32 viewport_interaction_get_item_right(sint32 x, sint32 y, viewport_interact
     }
 
     if (!(input_test_flag(INPUT_FLAG_6)) || !(input_test_flag(INPUT_FLAG_TOOL_ACTIVE))) {
-        if (window_find_by_class(WC_RIDE_CONSTRUCTION) == NULL && window_find_by_class(WC_FOOTPATH) == NULL) {
+        if (window_find_by_class(WC_RIDE_CONSTRUCTION) == nullptr && window_find_by_class(WC_FOOTPATH) == nullptr) {
             return info->type = VIEWPORT_INTERACTION_ITEM_NONE;
         }
     }
@@ -449,7 +449,7 @@ static void viewport_interaction_remove_footpath(rct_tile_element *tileElement,
     z = tileElement->base_height;
 
     w = window_find_by_class(WC_FOOTPATH);
-    if (w != NULL)
+    if (w != nullptr)
         footpath_provisional_update();
 
     tileElement2 = map_get_first_element_at(x / 32, y / 32);
@@ -565,17 +565,17 @@ static rct_peep *viewport_interaction_get_closest_peep(sint32 x, sint32 y, sint3
     rct_peep *peep, *closestPeep;
 
     w = window_find_from_point(x, y);
-    if (w == NULL)
-        return 0;
+    if (w == nullptr)
+        return nullptr;
 
     viewport = w->viewport;
-    if (viewport == NULL || viewport->zoom >= 2)
-        return 0;
+    if (viewport == nullptr || viewport->zoom >= 2)
+        return nullptr;
 
     x = ((x - viewport->x) << viewport->zoom) + viewport->view_x;
     y = ((y - viewport->y) << viewport->zoom) + viewport->view_y;
 
-    closestPeep = NULL;
+    closestPeep = nullptr;
     closestDistance = 0xFFFF;
     FOR_ALL_PEEPS(spriteIndex, peep) {
         if (peep->sprite_left == LOCATION_NULL)
@@ -651,8 +651,8 @@ void sub_68A15E(sint32 screenX, sint32 screenY, sint16 *x, sint16 *y, sint32 *di
 
     *x = map_pos.x & ~0x1F;
     *y = map_pos.y & ~0x1F;
-    if (direction != NULL) *direction = myDirection;
-    if (tileElement != NULL) *tileElement = myTileElement;
+    if (direction != nullptr) *direction = myDirection;
+    if (tileElement != nullptr) *tileElement = myTileElement;
 }
 
 }
diff --git a/src/openrct2/interface/Widget.cpp b/src/openrct2/interface/Widget.cpp
index c836e44b9a..7e5a29cc5c 100644
--- a/src/openrct2/interface/Widget.cpp
+++ b/src/openrct2/interface/Widget.cpp
@@ -1054,7 +1054,7 @@ static void widget_text_box_draw(rct_drawpixelinfo *dpi, rct_window *w, rct_widg
     gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM;
     gCurrentFontFlags = 0;
 
-    if (!active || gTextInput == NULL) {
+    if (!active || gTextInput == nullptr) {
 
         if (w->widgets[widgetIndex].text != 0) {
             safe_strcpy(wrapped_string, w->widgets[widgetIndex].string, 512);
diff --git a/src/openrct2/interface/Window.cpp b/src/openrct2/interface/Window.cpp
index 67d817d3c1..7e3c9d3eac 100644
--- a/src/openrct2/interface/Window.cpp
+++ b/src/openrct2/interface/Window.cpp
@@ -49,7 +49,7 @@ extern "C"
 
 rct_window g_window_list[WINDOW_LIMIT_MAX + WINDOW_LIMIT_RESERVED];
 rct_window * gWindowFirst;
-rct_window * gWindowNextSlot = NULL;
+rct_window * gWindowNextSlot = nullptr;
 rct_window * gWindowAudioExclusive;
 
 uint16 TextInputDescriptionArgs[4];
@@ -132,7 +132,7 @@ static rct_widget *window_get_scroll_widget(rct_window *w, sint32 scrollIndex)
         scrollIndex--;
     }
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -149,7 +149,7 @@ void window_dispatch_update_all()
 void window_update_all_viewports()
 {
     for (rct_window *w = g_window_list; w < RCT2_NEW_WINDOW; w++)
-        if (w->viewport != NULL && window_is_visible(w))
+        if (w->viewport != nullptr && window_is_visible(w))
             viewport_update_position(w);
 }
 
@@ -305,7 +305,7 @@ static void window_all_wheel_input()
     // Check window cursor is over
     if (!(input_test_flag(INPUT_FLAG_5))) {
         rct_window *w = window_find_from_point(cursorState->x, cursorState->y);
-        if (w != NULL) {
+        if (w != nullptr) {
             // Check if main window
             if (w->classification == WC_MAIN_WINDOW || w->classification == WC_VIEWPORT) {
                 window_viewport_wheel_input(w, relative_wheel);
@@ -351,14 +351,14 @@ static void window_close_surplus(sint32 cap, sint8 avoid_classification)
     //difference between amount open and cap = amount to close
     diff = count - WINDOW_LIMIT_RESERVED - cap;
     for (i = 0; i < diff; i++) {
-        rct_window *w = NULL;
+        rct_window *w = nullptr;
         //iterates through the list until it finds the newest window, or a window that can be closed
         for (w = g_window_list; w < RCT2_NEW_WINDOW; w++) {
             if (!(w->flags & (WF_STICK_TO_BACK | WF_STICK_TO_FRONT | WF_NO_AUTO_CLOSE)))
                 break;
         }
         //skip window if window matches specified rct_windowclass (as user may be modifying via options)
-        if (avoid_classification != -1 && w != NULL && w->classification == avoid_classification) {
+        if (avoid_classification != -1 && w != nullptr && w->classification == avoid_classification) {
             continue;
         }
         window_close(w);
@@ -398,7 +398,7 @@ rct_window *window_create(sint32 x, sint32 y, sint32 width, sint32 height, rct_w
     // Check if there are any window slots left
     // include WINDOW_LIMIT_RESERVED for items such as the main viewport and toolbars to not appear to be counted.
     if (RCT2_NEW_WINDOW >= &(g_window_list[gConfigGeneral.window_limit + WINDOW_LIMIT_RESERVED])) {
-        rct_window *w = NULL;
+        rct_window *w = nullptr;
         // Close least recently used window
         for (w = g_window_list; w < RCT2_NEW_WINDOW; w++)
             if (!(w->flags & (WF_STICK_TO_BACK | WF_STICK_TO_FRONT | WF_NO_AUTO_CLOSE)))
@@ -445,7 +445,7 @@ rct_window *window_create(sint32 x, sint32 y, sint32 width, sint32 height, rct_w
     w->y = y;
     w->width = width;
     w->height = height;
-    w->viewport = NULL;
+    w->viewport = nullptr;
     w->event_handlers = event_handlers;
     w->enabled_widgets = 0;
     w->disabled_widgets = 0;
@@ -691,7 +691,7 @@ void window_close(rct_window* window)
 {
     sint32 num_windows;
 
-    if (window == NULL)
+    if (window == nullptr)
         return;
 
     // Make a copy of the window class and number in case
@@ -702,13 +702,13 @@ void window_close(rct_window* window)
     window_event_close_call(window);
 
     window = window_find_by_number(cls, number);
-    if (window == NULL)
+    if (window == nullptr)
         return;
 
     // Remove viewport
-    if (window->viewport != NULL) {
+    if (window->viewport != nullptr) {
         window->viewport->width = 0;
-        window->viewport = NULL;
+        window->viewport = nullptr;
     }
 
     // Invalidate the window (area)
@@ -770,7 +770,7 @@ rct_window *window_find_by_class(rct_windowclass cls)
         if (w->classification == cls)
             return w;
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -788,7 +788,7 @@ rct_window *window_find_by_number(rct_windowclass cls, rct_windownumber number)
         if (w->classification == cls && w->number == number)
             return w;
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -882,7 +882,7 @@ rct_window *window_find_from_point(sint32 x, sint32 y)
         return w;
     }
 
-    return NULL;
+    return nullptr;
 }
 
 /**
@@ -930,7 +930,7 @@ rct_widgetindex window_find_widget_from_point(rct_window *w, sint32 x, sint32 y)
  */
 void window_invalidate(rct_window *window)
 {
-    if (window != NULL)
+    if (window != nullptr)
         gfx_set_dirty_blocks(window->x, window->y, window->x + window->width, window->y + window->height);
 }
 
@@ -1161,7 +1161,7 @@ rct_window *window_bring_to_front(rct_window *w)
     if (w->x + w->width < 20) {
         sint32 i = 20 - w->x;
         w->x += i;
-        if (w->viewport != NULL)
+        if (w->viewport != nullptr)
             w->viewport->x += i;
         window_invalidate(w);
     }
@@ -1174,7 +1174,7 @@ rct_window *window_bring_to_front_by_class_with_flags(rct_windowclass cls, uint1
     rct_window* w;
 
     w = window_find_by_class(cls);
-    if (w != NULL) {
+    if (w != nullptr) {
         w->flags |= flags;
         window_invalidate(w);
         w = window_bring_to_front(w);
@@ -1199,7 +1199,7 @@ rct_window *window_bring_to_front_by_number(rct_windowclass cls, rct_windownumbe
     rct_window* w;
 
     w = window_find_by_number(cls, number);
-    if (w != NULL) {
+    if (w != nullptr) {
         w->flags |= WF_WHITE_BORDER_MASK;
         window_invalidate(w);
         w = window_bring_to_front(w);
@@ -1234,7 +1234,7 @@ void window_push_others_right(rct_window* window)
         uint16 push_amount = window->x + window->width - w->x + 3;
         w->x += push_amount;
         window_invalidate(w);
-        if (w->viewport != NULL)
+        if (w->viewport != nullptr)
             w->viewport->x += push_amount;
     }
 }
@@ -1277,7 +1277,7 @@ void window_push_others_below(rct_window *w1)
         window_invalidate(w2);
 
         // Update viewport position if necessary
-        if (w2->viewport != NULL)
+        if (w2->viewport != nullptr)
             w2->viewport->y += push_amount;
     }
 }
@@ -1288,14 +1288,14 @@ void window_push_others_below(rct_window *w1)
  */
 rct_window *window_get_main()
 {
-    rct_window* w = NULL;
+    rct_window* w = nullptr;
 
     for (w = g_window_list; w < RCT2_NEW_WINDOW; w++)
         if (w->classification == WC_MAIN_WINDOW)
             return w;
 
-    openrct2_assert(w != NULL, "Failed to get main window");
-    return NULL;
+    openrct2_assert(w != nullptr, "Failed to get main window");
+    return nullptr;
 }
 
 /**
@@ -1308,7 +1308,7 @@ void window_scroll_to_viewport(rct_window *w)
     rct_window *mainWindow;
     assert(w != NULL);
     // In original checked to make sure x and y were not -1 as well.
-    if (w->viewport == NULL || w->viewport_focus_coordinates.y == -1)
+    if (w->viewport == nullptr || w->viewport_focus_coordinates.y == -1)
         return;
 
     if (w->viewport_focus_sprite.type & VIEWPORT_FOCUS_TYPE_SPRITE) {
@@ -1323,7 +1323,7 @@ void window_scroll_to_viewport(rct_window *w)
     }
 
     mainWindow = window_get_main();
-    if (mainWindow != NULL)
+    if (mainWindow != nullptr)
         window_scroll_to_location(mainWindow, x, y, z);
 }
 
@@ -1432,7 +1432,7 @@ static void call_event_viewport_rotate_on_all_windows()
 void window_rotate_camera(rct_window *w, sint32 direction)
 {
     rct_viewport *viewport = w->viewport;
-    if (viewport == NULL)
+    if (viewport == nullptr)
         return;
 
     sint16 x = (viewport->width >> 1) + viewport->x;
@@ -1478,7 +1478,7 @@ void window_viewport_get_map_coords_by_cursor(rct_window *w, sint16 *map_x, sint
     context_get_cursor_position_scaled(&mouse_x, &mouse_y);
 
     // Compute map coordinate by mouse position.
-    get_map_coordinates_from_pos(mouse_x, mouse_y, VIEWPORT_INTERACTION_MASK_NONE, map_x, map_y, NULL, NULL, NULL);
+    get_map_coordinates_from_pos(mouse_x, mouse_y, VIEWPORT_INTERACTION_MASK_NONE, map_x, map_y, nullptr, nullptr, nullptr);
 
     // Get viewport coordinates centring around the tile.
     sint32 base_height = tile_element_height(*map_x, *map_y);
@@ -1584,7 +1584,7 @@ void main_window_zoom(bool zoomIn, bool atCursor) {
     if (!(gScreenFlags & SCREEN_FLAGS_SCENARIO_EDITOR) || gS6Info.editor_step == EDITOR_STEP_LANDSCAPE_EDITOR) {
         if (!(gScreenFlags & SCREEN_FLAGS_TRACK_MANAGER)) {
             rct_window *mainWindow = window_get_main();
-            if (mainWindow != NULL)
+            if (mainWindow != nullptr)
                 window_zoom_set(mainWindow, mainWindow->viewport->zoom + (zoomIn ? -1 : 1), atCursor);
         }
     }
@@ -1787,7 +1787,7 @@ void window_move_position(rct_window *w, sint32 dx, sint32 dy)
     // Translate window and viewport
     w->x += dx;
     w->y += dy;
-    if (w->viewport != NULL) {
+    if (w->viewport != nullptr) {
         w->viewport->x += dx;
         w->viewport->y += dy;
     }
@@ -1903,7 +1903,7 @@ void tool_cancel()
                 gCurrentToolWidget.window_classification,
                 gCurrentToolWidget.window_number
             );
-            if (w != NULL)
+            if (w != nullptr)
                 window_event_tool_abort_call(w, gCurrentToolWidget.widget_index);
         }
     }
@@ -1911,141 +1911,141 @@ void tool_cancel()
 
 void window_event_close_call(rct_window *w)
 {
-    if (w->event_handlers->close != NULL)
+    if (w->event_handlers->close != nullptr)
         w->event_handlers->close(w);
 }
 
 void window_event_mouse_up_call(rct_window *w, rct_widgetindex widgetIndex)
 {
-    if (w->event_handlers->mouse_up != NULL)
+    if (w->event_handlers->mouse_up != nullptr)
         w->event_handlers->mouse_up(w, widgetIndex);
 }
 
 void window_event_resize_call(rct_window *w)
 {
-    if (w->event_handlers->resize != NULL)
+    if (w->event_handlers->resize != nullptr)
         w->event_handlers->resize(w);
 }
 
 void window_event_mouse_down_call(rct_window *w, rct_widgetindex widgetIndex)
 {
-    if (w->event_handlers->mouse_down != NULL)
+    if (w->event_handlers->mouse_down != nullptr)
         w->event_handlers->mouse_down(w, widgetIndex, &w->widgets[widgetIndex]);
 }
 
 void window_event_dropdown_call(rct_window *w, rct_widgetindex widgetIndex, sint32 dropdownIndex)
 {
-    if (w->event_handlers->dropdown != NULL)
+    if (w->event_handlers->dropdown != nullptr)
         w->event_handlers->dropdown(w, widgetIndex, dropdownIndex);
 }
 
 void window_event_unknown_05_call(rct_window *w)
 {
-    if (w->event_handlers->unknown_05 != NULL)
+    if (w->event_handlers->unknown_05 != nullptr)
         w->event_handlers->unknown_05(w);
 }
 
 void window_event_update_call(rct_window *w)
 {
-    if (w->event_handlers->update != NULL)
+    if (w->event_handlers->update != nullptr)
         w->event_handlers->update(w);
 }
 
 void window_event_unknown_07_call(rct_window *w)
 {
-    if (w->event_handlers->unknown_07 != NULL)
+    if (w->event_handlers->unknown_07 != nullptr)
         w->event_handlers->unknown_07(w);
 }
 
 void window_event_unknown_08_call(rct_window *w)
 {
-    if (w->event_handlers->unknown_08 != NULL)
+    if (w->event_handlers->unknown_08 != nullptr)
         w->event_handlers->unknown_08(w);
 }
 
 void window_event_tool_update_call(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->tool_update != NULL)
+    if (w->event_handlers->tool_update != nullptr)
         w->event_handlers->tool_update(w, widgetIndex, x, y);
 }
 
 void window_event_tool_down_call(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->tool_down != NULL)
+    if (w->event_handlers->tool_down != nullptr)
         w->event_handlers->tool_down(w, widgetIndex, x, y);
 }
 
 void window_event_tool_drag_call(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->tool_drag != NULL)
+    if (w->event_handlers->tool_drag != nullptr)
         w->event_handlers->tool_drag(w, widgetIndex, x, y);
 }
 
 void window_event_tool_up_call(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->tool_up != NULL)
+    if (w->event_handlers->tool_up != nullptr)
         w->event_handlers->tool_up(w, widgetIndex, x, y);
 }
 
 void window_event_tool_abort_call(rct_window *w, rct_widgetindex widgetIndex)
 {
-    if (w->event_handlers->tool_abort != NULL)
+    if (w->event_handlers->tool_abort != nullptr)
         w->event_handlers->tool_abort(w, widgetIndex);
 }
 
 void window_event_unknown_0E_call(rct_window *w)
 {
-    if (w->event_handlers->unknown_0E != NULL)
+    if (w->event_handlers->unknown_0E != nullptr)
         w->event_handlers->unknown_0E(w);
 }
 
 void window_get_scroll_size(rct_window *w, sint32 scrollIndex, sint32 *width, sint32 *height)
 {
-    if (w->event_handlers->get_scroll_size != NULL) {
+    if (w->event_handlers->get_scroll_size != nullptr) {
         w->event_handlers->get_scroll_size(w, scrollIndex, width, height);
     }
 }
 
 void window_event_scroll_mousedown_call(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->scroll_mousedown != NULL)
+    if (w->event_handlers->scroll_mousedown != nullptr)
         w->event_handlers->scroll_mousedown(w, scrollIndex, x, y);
 }
 
 void window_event_scroll_mousedrag_call(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->scroll_mousedrag != NULL)
+    if (w->event_handlers->scroll_mousedrag != nullptr)
         w->event_handlers->scroll_mousedrag(w, scrollIndex, x, y);
 }
 
 void window_event_scroll_mouseover_call(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y)
 {
-    if (w->event_handlers->scroll_mouseover != NULL)
+    if (w->event_handlers->scroll_mouseover != nullptr)
         w->event_handlers->scroll_mouseover(w, scrollIndex, x, y);
 }
 
 void window_event_textinput_call(rct_window *w, rct_widgetindex widgetIndex, char *text)
 {
-    if (w->event_handlers->text_input != NULL)
+    if (w->event_handlers->text_input != nullptr)
         w->event_handlers->text_input(w, widgetIndex, text);
 }
 
 void window_event_viewport_rotate_call(rct_window *w)
 {
-    if (w->event_handlers->viewport_rotate != NULL)
+    if (w->event_handlers->viewport_rotate != nullptr)
         w->event_handlers->viewport_rotate(w);
 }
 
 void window_event_unknown_15_call(rct_window *w, sint32 scrollIndex, sint32 scrollAreaType)
 {
-    if (w->event_handlers->unknown_15 != NULL)
+    if (w->event_handlers->unknown_15 != nullptr)
         w->event_handlers->unknown_15(w, scrollIndex, scrollAreaType);
 }
 
 rct_string_id window_event_tooltip_call(rct_window *w, rct_widgetindex widgetIndex)
 {
     rct_string_id result = 0;
-    if (w->event_handlers->tooltip != NULL)
+    if (w->event_handlers->tooltip != nullptr)
         w->event_handlers->tooltip(w, widgetIndex, &result);
     return result;
 }
@@ -2053,32 +2053,32 @@ rct_string_id window_event_tooltip_call(rct_window *w, rct_widgetindex widgetInd
 sint32 window_event_cursor_call(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y)
 {
     sint32 cursorId = CURSOR_ARROW;
-    if (w->event_handlers->cursor != NULL)
+    if (w->event_handlers->cursor != nullptr)
         w->event_handlers->cursor(w, widgetIndex, x, y, &cursorId);
     return cursorId;
 }
 
 void window_event_moved_call(rct_window *w, sint32 x, sint32 y)
 {
-    if (w->event_handlers->moved != NULL)
+    if (w->event_handlers->moved != nullptr)
         w->event_handlers->moved(w, x, y);
 }
 
 void window_event_invalidate_call(rct_window *w)
 {
-    if (w->event_handlers->invalidate != NULL)
+    if (w->event_handlers->invalidate != nullptr)
         w->event_handlers->invalidate(w);
 }
 
 void window_event_paint_call(rct_window *w, rct_drawpixelinfo *dpi)
 {
-    if (w->event_handlers->paint != NULL)
+    if (w->event_handlers->paint != nullptr)
         w->event_handlers->paint(w, dpi);
 }
 
 void window_event_scroll_paint_call(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex)
 {
-    if (w->event_handlers->scroll_paint != NULL)
+    if (w->event_handlers->scroll_paint != nullptr)
         w->event_handlers->scroll_paint(w, dpi, scrollIndex);
 }
 
@@ -2138,7 +2138,7 @@ void window_resize_gui(sint32 width, sint32 height)
         return;
     }
     rct_window *mainWind = window_get_main();
-    if (mainWind != NULL) {
+    if (mainWind != nullptr) {
         rct_viewport* viewport = mainWind->viewport;
         mainWind->width = width;
         mainWind->height = height;
@@ -2146,37 +2146,37 @@ void window_resize_gui(sint32 width, sint32 height)
         viewport->height = height;
         viewport->view_width = width << viewport->zoom;
         viewport->view_height = height << viewport->zoom;
-        if (mainWind->widgets != NULL && mainWind->widgets[WC_MAIN_WINDOW__0].type == WWT_VIEWPORT){
+        if (mainWind->widgets != nullptr && mainWind->widgets[WC_MAIN_WINDOW__0].type == WWT_VIEWPORT){
             mainWind->widgets[WC_MAIN_WINDOW__0].right = width;
             mainWind->widgets[WC_MAIN_WINDOW__0].bottom = height;
         }
     }
 
     rct_window *topWind = window_find_by_class(WC_TOP_TOOLBAR);
-    if (topWind != NULL) {
+    if (topWind != nullptr) {
         topWind->width = std::max(640, width);
     }
 
     rct_window *bottomWind = window_find_by_class(WC_BOTTOM_TOOLBAR);
-    if (bottomWind != NULL) {
+    if (bottomWind != nullptr) {
         bottomWind->y = height - 32;
         bottomWind->width = std::max(640, width);
     }
 
     rct_window *titleWind = window_find_by_class(WC_TITLE_MENU);
-    if (titleWind != NULL) {
+    if (titleWind != nullptr) {
         titleWind->x = (width - titleWind->width) / 2;
         titleWind->y = height - 142;
     }
 
     rct_window *exitWind = window_find_by_class(WC_TITLE_EXIT);
-    if (exitWind != NULL) {
+    if (exitWind != nullptr) {
         exitWind->x = width - 40;
         exitWind->y = height - 64;
     }
 
     rct_window *optionsWind = window_find_by_class(WC_TITLE_OPTIONS);
-    if (optionsWind != NULL) {
+    if (optionsWind != nullptr) {
         optionsWind->x = width - 80;
     }
 
@@ -2197,19 +2197,19 @@ void window_resize_gui_scenario_editor(sint32 width, sint32 height)
         viewport->height = height;
         viewport->view_width = width << viewport->zoom;
         viewport->view_height = height << viewport->zoom;
-        if (mainWind->widgets != NULL && mainWind->widgets[WC_MAIN_WINDOW__0].type == WWT_VIEWPORT){
+        if (mainWind->widgets != nullptr && mainWind->widgets[WC_MAIN_WINDOW__0].type == WWT_VIEWPORT){
             mainWind->widgets[WC_MAIN_WINDOW__0].right = width;
             mainWind->widgets[WC_MAIN_WINDOW__0].bottom = height;
         }
     }
 
     rct_window *topWind = window_find_by_class(WC_TOP_TOOLBAR);
-    if (topWind != NULL) {
+    if (topWind != nullptr) {
         topWind->width = std::max(640, width);
     }
 
     rct_window *bottomWind = window_find_by_class(WC_BOTTOM_TOOLBAR);
-    if (bottomWind != NULL) {
+    if (bottomWind != nullptr) {
         bottomWind->y = height - 32;
         bottomWind->width = std::max(640, width);
     }
@@ -2285,11 +2285,11 @@ void window_update_viewport_ride_music()
     rct_window *w;
 
     gRideMusicParamsListEnd = &gRideMusicParamsList[0];
-    g_music_tracking_viewport = NULL;
+    g_music_tracking_viewport = nullptr;
 
     for (w = RCT2_LAST_WINDOW; w >= g_window_list; w--) {
         viewport = w->viewport;
-        if (viewport == NULL || !(viewport->flags & VIEWPORT_FLAG_SOUND_ON))
+        if (viewport == nullptr || !(viewport->flags & VIEWPORT_FLAG_SOUND_ON))
             continue;
 
         g_music_tracking_viewport = viewport;
@@ -2522,7 +2522,7 @@ void window_cancel_textbox()
             gCurrentTextBox.window.classification,
             gCurrentTextBox.window.number
             );
-        window_event_textinput_call(w, gCurrentTextBox.widget_index, NULL);
+        window_event_textinput_call(w, gCurrentTextBox.widget_index, nullptr);
         gCurrentTextBox.window.classification = WC_NULL;
         gCurrentTextBox.window.number = 0;
         context_stop_text_input();
@@ -2555,14 +2555,14 @@ void window_update_textbox()
 bool window_is_visible(rct_window* w)
 {
     // w->visibility is used to prevent repeat calculations within an iteration by caching the result
-    if (w == NULL)
+    if (w == nullptr)
         return false;
 
     if (w->visibility == VC_VISIBLE) return true;
     if (w->visibility == VC_COVERED) return false;
 
     // only consider viewports, consider the main window always visible
-    if (w->viewport == NULL || w->classification == WC_MAIN_WINDOW)
+    if (w->viewport == nullptr || w->classification == WC_MAIN_WINDOW)
     {
         // default to previous behaviour
         w->visibility = VC_VISIBLE;
@@ -2620,12 +2620,12 @@ void window_draw_all(rct_drawpixelinfo *dpi, sint16 left, sint16 top, sint16 rig
 
 rct_viewport * window_get_previous_viewport(rct_viewport * current)
 {
-    bool foundPrevious = (current == NULL);
+    bool foundPrevious = (current == nullptr);
     rct_window * window = gWindowNextSlot;
 
-    if (window == NULL)
+    if (window == nullptr)
     {
-        return NULL;
+        return nullptr;
     }
 
     while (true)
@@ -2636,7 +2636,7 @@ rct_viewport * window_get_previous_viewport(rct_viewport * current)
             break;
         }
 
-        if (window->viewport == NULL)
+        if (window->viewport == nullptr)
         {
             continue;
         }
@@ -2652,7 +2652,7 @@ rct_viewport * window_get_previous_viewport(rct_viewport * current)
         }
     }
 
-    return NULL;
+    return nullptr;
 }
 
 void window_reset_visibilities()
@@ -2661,7 +2661,7 @@ void window_reset_visibilities()
     for (rct_window * w = g_window_list; w < gWindowNextSlot; w++)
     {
         w->visibility = VC_UNKNOWN;
-        if (w->viewport != NULL)
+        if (w->viewport != nullptr)
         {
             w->viewport->visibility = VC_UNKNOWN;
         }
@@ -2670,7 +2670,7 @@ void window_reset_visibilities()
 
 void window_init_all()
 {
-    if (gWindowNextSlot != NULL)
+    if (gWindowNextSlot != nullptr)
     {
         window_close_all();
     }
diff --git a/src/openrct2/localisation/Convert.cpp b/src/openrct2/localisation/Convert.cpp
index 82a63eab71..7a94a465ec 100644
--- a/src/openrct2/localisation/Convert.cpp
+++ b/src/openrct2/localisation/Convert.cpp
@@ -74,7 +74,7 @@ static sint32 encoding_search_compare(const void *pKey, const void *pEntry)
 static wchar_t encoding_convert_x_to_unicode(wchar_t code, const encoding_convert_entry *table, size_t count)
 {
     encoding_convert_entry * entry = (encoding_convert_entry *)bsearch(&code, table, count, sizeof(encoding_convert_entry), encoding_search_compare);
-    if (entry == NULL) return code;
+    if (entry == nullptr) return code;
     else return entry->unicode;
 }
 
diff --git a/src/openrct2/localisation/Currency.cpp b/src/openrct2/localisation/Currency.cpp
index fc424b365e..2e84a8549a 100644
--- a/src/openrct2/localisation/Currency.cpp
+++ b/src/openrct2/localisation/Currency.cpp
@@ -43,7 +43,7 @@ void currency_load_custom_currency_config()
 {
     CurrencyDescriptors[CURRENCY_CUSTOM].rate = gConfigGeneral.custom_currency_rate;
     CurrencyDescriptors[CURRENCY_CUSTOM].affix_unicode = gConfigGeneral.custom_currency_affix;
-    if (gConfigGeneral.custom_currency_symbol != NULL)
+    if (gConfigGeneral.custom_currency_symbol != nullptr)
     {
         safe_strcpy(CurrencyDescriptors[CURRENCY_CUSTOM].symbol_unicode, gConfigGeneral.custom_currency_symbol, CURRENCY_SYMBOL_MAX_SIZE);
     }
diff --git a/src/openrct2/localisation/Date.cpp b/src/openrct2/localisation/Date.cpp
index 9b1499cbf2..0c36b347f0 100644
--- a/src/openrct2/localisation/Date.cpp
+++ b/src/openrct2/localisation/Date.cpp
@@ -83,7 +83,7 @@ void date_update()
 
 void date_update_real_time_of_day()
 {
-    time_t timestamp = time(0);
+    time_t timestamp = time(nullptr);
     struct tm *now = localtime(&timestamp);
 
     gRealTimeOfDay.second = now->tm_sec;
diff --git a/src/openrct2/localisation/FormatCodes.cpp b/src/openrct2/localisation/FormatCodes.cpp
index 174740ef81..f0d1782266 100644
--- a/src/openrct2/localisation/FormatCodes.cpp
+++ b/src/openrct2/localisation/FormatCodes.cpp
@@ -117,7 +117,7 @@ const char *format_get_token(uint32 code)
         if (code == format_code_tokens[i].code)
             return format_code_tokens[i].token;
     }
-    return 0;
+    return nullptr;
 }
 
 bool utf8_should_use_sprite_for_codepoint(sint32 codepoint)
diff --git a/src/openrct2/localisation/Localisation.cpp b/src/openrct2/localisation/Localisation.cpp
index b32d03a231..c1e316bff6 100644
--- a/src/openrct2/localisation/Localisation.cpp
+++ b/src/openrct2/localisation/Localisation.cpp
@@ -433,7 +433,7 @@ static void format_comma_separated_integer(char **dest, size_t *size, sint64 val
     char *nbegin, *nend, *ncur;
     char tmp;
     const char *commaMark = language_get_string(STR_LOCALE_THOUSANDS_SEPARATOR);
-    const char *ch = NULL;
+    const char *ch = nullptr;
 
     if ((*size) == 0) return;
 
@@ -459,9 +459,9 @@ static void format_comma_separated_integer(char **dest, size_t *size, sint64 val
             ch = commaMark;
         }
 
-        if (ch != NULL ) {
+        if (ch != nullptr ) {
             format_push_char_safe(*ch++);
-            if (*ch == '\0') ch = NULL;
+            if (*ch == '\0') ch = nullptr;
         } else {
             digit = value % 10;
             value /= 10;
@@ -481,9 +481,9 @@ static void format_comma_separated_integer(char **dest, size_t *size, sint64 val
                 ch = commaMark;
             }
 
-            if (ch != NULL ) {
+            if (ch != nullptr ) {
                 format_push_wrap(*ch++);
-                if (*ch == '\0') ch = NULL;
+                if (*ch == '\0') ch = nullptr;
             } else {
                 digit = value % 10;
                 value /= 10;
@@ -517,7 +517,7 @@ static void format_comma_separated_fixed_1dp(char **dest, size_t *size, sint64 v
     char tmp;
     const char *commaMark = language_get_string(STR_LOCALE_THOUSANDS_SEPARATOR);
     const char *decimalMark = language_get_string(STR_LOCALE_DECIMAL_POINT);
-    const char *ch = NULL;
+    const char *ch = nullptr;
     sint32 zeroNeeded = 1;
 
     if ((*size) == 0) return;
@@ -550,9 +550,9 @@ static void format_comma_separated_fixed_1dp(char **dest, size_t *size, sint64 v
             ch = commaMark;
         }
 
-        if (ch != NULL ) {
+        if (ch != nullptr ) {
             format_push_char_safe(*ch++);
-            if (*ch == '\0') ch = NULL;
+            if (*ch == '\0') ch = nullptr;
         } else {
             zeroNeeded = 0;
             digit = value % 10;
@@ -573,9 +573,9 @@ static void format_comma_separated_fixed_1dp(char **dest, size_t *size, sint64 v
                 ch = commaMark;
             }
 
-            if (ch != NULL ) {
+            if (ch != nullptr ) {
                 format_push_wrap(*ch++);
-                if (*ch == '\0') ch = NULL;
+                if (*ch == '\0') ch = nullptr;
             } else {
                 zeroNeeded = 0;
                 digit = value % 10;
@@ -610,7 +610,7 @@ static void format_comma_separated_fixed_2dp(char **dest, size_t *size, sint64 v
     char tmp;
     const char *commaMark = language_get_string(STR_LOCALE_THOUSANDS_SEPARATOR);
     const char *decimalMark = language_get_string(STR_LOCALE_DECIMAL_POINT);
-    const char *ch = NULL;
+    const char *ch = nullptr;
     sint32 zeroNeeded = 1;
 
     if ((*size) == 0) return;
@@ -649,9 +649,9 @@ static void format_comma_separated_fixed_2dp(char **dest, size_t *size, sint64 v
             ch = commaMark;
         }
 
-        if (ch != NULL ) {
+        if (ch != nullptr ) {
             format_push_char_safe(*ch++);
-            if (*ch == '\0') ch = NULL;
+            if (*ch == '\0') ch = nullptr;
         } else {
             zeroNeeded = 0;
             digit = value % 10;
@@ -672,9 +672,9 @@ static void format_comma_separated_fixed_2dp(char **dest, size_t *size, sint64 v
                 ch = commaMark;
             }
 
-            if (ch != NULL ) {
+            if (ch != nullptr ) {
                 format_push_wrap(*ch++);
-                if (*ch == '\0') ch = NULL;
+                if (*ch == '\0') ch = nullptr;
             } else {
                 zeroNeeded = 0;
                 digit = value % 10;
@@ -1271,16 +1271,16 @@ money32 string_to_money(char * string_to_monetise)
     }
 
     int number = 0, decimal = 0;
-    if (strstr(buffer, decimal_char) == NULL) {
+    if (strstr(buffer, decimal_char) == nullptr) {
         // If decimal char does not exist, no tokenising is needed.
         number = atoi(buffer);
     }
     else {
         char *numberText = strtok(buffer, decimal_char);
-        char *decimalText = strtok(NULL, decimal_char);
+        char *decimalText = strtok(nullptr, decimal_char);
 
-        if (numberText != NULL) number = atoi(numberText);
-        if (decimalText != NULL) decimal = atoi(decimalText);
+        if (numberText != nullptr) number = atoi(numberText);
+        if (decimalText != nullptr) decimal = atoi(decimalText);
 
         // The second parameter in MONEY must be two digits in length, while the game only ever uses
         // the first of the two digits.
diff --git a/src/openrct2/localisation/UTF8.cpp b/src/openrct2/localisation/UTF8.cpp
index b39ae55100..09cd41bd9a 100644
--- a/src/openrct2/localisation/UTF8.cpp
+++ b/src/openrct2/localisation/UTF8.cpp
@@ -40,7 +40,7 @@ uint32 utf8_get_next(const utf8 *char_ptr, const utf8 **nextchar_ptr)
         numBytes = 1;
     }
 
-    if (nextchar_ptr != NULL)
+    if (nextchar_ptr != nullptr)
         *nextchar_ptr = char_ptr + numBytes;
     return result;
 }