diff --git a/src/openrct2-ui/input/InputManager.cpp b/src/openrct2-ui/input/InputManager.cpp
index 38f03d0e4f..5c4bb40572 100644
--- a/src/openrct2-ui/input/InputManager.cpp
+++ b/src/openrct2-ui/input/InputManager.cpp
@@ -27,6 +27,11 @@
 
 using namespace OpenRCT2::Ui;
 
+InputManager::InputManager()
+{
+    _modifierKeyState = EnumValue(ModifierKey::none);
+}
+
 void InputManager::QueueInputEvent(const SDL_Event& e)
 {
     switch (e.type)
@@ -126,7 +131,7 @@ void InputManager::HandleViewScrolling()
         if (InputGetState() != InputState::Normal)
             return;
 
-        if (gInputPlaceObjectModifier & (PLACE_OBJECT_MODIFIER_SHIFT_Z | PLACE_OBJECT_MODIFIER_COPY_Z))
+        if (IsModifierKeyPressed(ModifierKey::shift) || IsModifierKeyPressed(ModifierKey::ctrl))
             return;
 
         GameHandleEdgeScroll();
@@ -135,36 +140,42 @@ void InputManager::HandleViewScrolling()
 
 void InputManager::HandleModifiers()
 {
+    _modifierKeyState = EnumValue(ModifierKey::none);
+
     auto modifiers = SDL_GetModState();
-    gInputPlaceObjectModifier = PLACE_OBJECT_MODIFIER_NONE;
     if (modifiers & KMOD_SHIFT)
     {
-        gInputPlaceObjectModifier |= PLACE_OBJECT_MODIFIER_SHIFT_Z;
+        _modifierKeyState |= EnumValue(ModifierKey::shift);
     }
     if (modifiers & KMOD_CTRL)
     {
-        gInputPlaceObjectModifier |= PLACE_OBJECT_MODIFIER_COPY_Z;
+        _modifierKeyState |= EnumValue(ModifierKey::ctrl);
     }
     if (modifiers & KMOD_ALT)
     {
-        gInputPlaceObjectModifier |= 4;
+        _modifierKeyState |= EnumValue(ModifierKey::alt);
     }
 #ifdef __MACOSX__
     if (modifiers & KMOD_GUI)
     {
-        gInputPlaceObjectModifier |= 8;
+        _modifierKeyState |= EnumValue(ModifierKey::cmd);
     }
 #endif
 
     if (Config::Get().general.VirtualFloorStyle != VirtualFloorStyles::Off)
     {
-        if (gInputPlaceObjectModifier & (PLACE_OBJECT_MODIFIER_COPY_Z | PLACE_OBJECT_MODIFIER_SHIFT_Z))
+        if (IsModifierKeyPressed(ModifierKey::ctrl) || IsModifierKeyPressed(ModifierKey::shift))
             VirtualFloorEnable();
         else
             VirtualFloorDisable();
     }
 }
 
+bool InputManager::IsModifierKeyPressed(ModifierKey modifier) const
+{
+    return _modifierKeyState & EnumValue(modifier);
+}
+
 void InputManager::ProcessEvents()
 {
     while (!_events.empty())
diff --git a/src/openrct2-ui/input/InputManager.h b/src/openrct2-ui/input/InputManager.h
index 4937dad5dc..4cd8fef1eb 100644
--- a/src/openrct2-ui/input/InputManager.h
+++ b/src/openrct2-ui/input/InputManager.h
@@ -43,6 +43,15 @@ namespace OpenRCT2::Ui
         InputEventState State;
     };
 
+    enum class ModifierKey : uint8_t
+    {
+        none = 0,
+        shift = 1 << 0,
+        ctrl = 1 << 1,
+        alt = 1 << 2,
+        cmd = 1 << 3,
+    };
+
     class InputManager
     {
     private:
@@ -52,6 +61,7 @@ namespace OpenRCT2::Ui
         ScreenCoordsXY _viewScroll;
         uint32_t _mouseState{};
         std::vector<uint8_t> _keyboardState;
+        uint8_t _modifierKeyState;
 
         void CheckJoysticks();
 
@@ -70,6 +80,9 @@ namespace OpenRCT2::Ui
         bool HasTextInputFocus() const;
 
     public:
+        InputManager();
+
+        bool IsModifierKeyPressed(ModifierKey modifier) const;
         void QueueInputEvent(const SDL_Event& e);
         void QueueInputEvent(InputEvent&& e);
         void Process();
diff --git a/src/openrct2-ui/input/MouseInput.cpp b/src/openrct2-ui/input/MouseInput.cpp
index 612addf5fe..5ea6805e5b 100644
--- a/src/openrct2-ui/input/MouseInput.cpp
+++ b/src/openrct2-ui/input/MouseInput.cpp
@@ -10,13 +10,15 @@
 #include "MouseInput.h"
 
 #include "../UiStringIds.h"
-#include "../interface/ViewportInteraction.h"
 
 #include <cassert>
 #include <cmath>
 #include <iterator>
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/Viewport.h>
+#include <openrct2-ui/interface/ViewportInteraction.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/interface/Window.h>
 #include <openrct2-ui/windows/Window.h>
@@ -1290,13 +1292,14 @@ void InputStateWidgetPressed(
         if (w->widgets[widgetIndex].type == WindowWidgetType::CloseBox && cursor_w_class == w->classification
             && cursor_w_number == w->number && widgetIndex == cursor_widgetIndex)
         {
-            if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_SHIFT_Z)
+            auto& im = GetInputManager();
+            if (im.IsModifierKeyPressed(ModifierKey::shift))
             {
                 gLastCloseModifier.window.number = w->number;
                 gLastCloseModifier.window.classification = w->classification;
                 gLastCloseModifier.modifier = CloseWindowModifier::Shift;
             }
-            else if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_COPY_Z)
+            else if (im.IsModifierKeyPressed(ModifierKey::ctrl))
             {
                 gLastCloseModifier.window.number = w->number;
                 gLastCloseModifier.window.classification = w->classification;
@@ -1645,11 +1648,6 @@ void GameHandleEdgeScroll()
     InputScrollViewport(ScreenCoordsXY(scrollX, scrollY));
 }
 
-bool InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER modifier)
-{
-    return gInputPlaceObjectModifier & modifier;
-}
-
 void InputScrollViewport(const ScreenCoordsXY& scrollScreenCoords)
 {
     WindowBase* mainWindow = WindowGetMain();
diff --git a/src/openrct2-ui/windows/Land.cpp b/src/openrct2-ui/windows/Land.cpp
index 830b66a25b..84152b69c9 100644
--- a/src/openrct2-ui/windows/Land.cpp
+++ b/src/openrct2-ui/windows/Land.cpp
@@ -7,11 +7,12 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#include "../interface/Viewport.h"
-
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/input/MouseInput.h>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/LandTool.h>
+#include <openrct2-ui/interface/Viewport.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Context.h>
@@ -601,7 +602,7 @@ static Widget window_land_widgets[] = {
          */
         void ToolUpdateLand(const ScreenCoordsXY& screenPos)
         {
-            const bool mapCtrlPressed = InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_COPY_Z);
+            const bool mapCtrlPressed = GetInputManager().IsModifierKeyPressed(ModifierKey::ctrl);
 
             MapInvalidateSelectionRect();
 
diff --git a/src/openrct2-ui/windows/MapTooltip.cpp b/src/openrct2-ui/windows/MapTooltip.cpp
index a7fd5b1dbc..41a3a95938 100644
--- a/src/openrct2-ui/windows/MapTooltip.cpp
+++ b/src/openrct2-ui/windows/MapTooltip.cpp
@@ -7,8 +7,9 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#include "../interface/Theme.h"
-
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
+#include <openrct2-ui/interface/Theme.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Context.h>
@@ -96,10 +97,9 @@ static Widget window_map_tooltip_widgets[] = {
         StringId stringId;
         std::memcpy(&stringId, _mapTooltipArgs.Data(), sizeof(StringId));
 
-        if (_cursorHoldDuration < 25 || stringId == STR_NONE
-            || InputTestPlaceObjectModifier(
-                static_cast<PLACE_OBJECT_MODIFIER>(PLACE_OBJECT_MODIFIER_COPY_Z | PLACE_OBJECT_MODIFIER_SHIFT_Z))
-            || WindowFindByClass(WindowClass::Error) != nullptr)
+        auto& im = GetInputManager();
+        if (_cursorHoldDuration < 25 || stringId == STR_NONE || im.IsModifierKeyPressed(ModifierKey::ctrl)
+            || im.IsModifierKeyPressed(ModifierKey::shift) || WindowFindByClass(WindowClass::Error) != nullptr)
         {
             WindowCloseByClass(WindowClass::MapTooltip);
         }
diff --git a/src/openrct2-ui/windows/RideConstruction.cpp b/src/openrct2-ui/windows/RideConstruction.cpp
index a4674ac97f..6e36ccf071 100644
--- a/src/openrct2-ui/windows/RideConstruction.cpp
+++ b/src/openrct2-ui/windows/RideConstruction.cpp
@@ -7,13 +7,14 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#include "../interface/ViewportInteraction.h"
-#include "../ride/Construction.h"
-
 #include <limits>
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/Viewport.h>
+#include <openrct2-ui/interface/ViewportInteraction.h>
 #include <openrct2-ui/interface/Widget.h>
+#include <openrct2-ui/ride/Construction.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Cheats.h>
 #include <openrct2/Context.h>
@@ -2921,10 +2922,11 @@ static Widget _rideConstructionWidgets[] = {
     static std::optional<CoordsXY> RideGetPlacePositionFromScreenPosition(ScreenCoordsXY screenCoords)
     {
         CoordsXY mapCoords;
+        auto& im = GetInputManager();
 
         if (!_trackPlaceCtrlState)
         {
-            if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_COPY_Z)
+            if (im.IsModifierKeyPressed(ModifierKey::ctrl))
             {
                 auto info = GetMapCoordinatesFromPos(screenCoords, 0xFCCA);
                 if (info.SpriteType != ViewportInteractionItem::None)
@@ -2936,7 +2938,7 @@ static Widget _rideConstructionWidgets[] = {
         }
         else
         {
-            if (!(gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_COPY_Z))
+            if (!(im.IsModifierKeyPressed(ModifierKey::ctrl)))
             {
                 _trackPlaceCtrlState = false;
             }
@@ -2944,7 +2946,7 @@ static Widget _rideConstructionWidgets[] = {
 
         if (!_trackPlaceShiftState)
         {
-            if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_SHIFT_Z)
+            if (im.IsModifierKeyPressed(ModifierKey::shift))
             {
                 _trackPlaceShiftState = true;
                 _trackPlaceShiftStart = screenCoords;
@@ -2953,7 +2955,7 @@ static Widget _rideConstructionWidgets[] = {
         }
         else
         {
-            if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_SHIFT_Z)
+            if (im.IsModifierKeyPressed(ModifierKey::shift))
             {
                 uint16_t maxHeight = ZoomLevel::max().ApplyTo(
                     std::numeric_limits<decltype(TileElement::BaseHeight)>::max() - 32);
diff --git a/src/openrct2-ui/windows/Scenery.cpp b/src/openrct2-ui/windows/Scenery.cpp
index 90678c0439..62dde13ad6 100644
--- a/src/openrct2-ui/windows/Scenery.cpp
+++ b/src/openrct2-ui/windows/Scenery.cpp
@@ -6,11 +6,13 @@
  *
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
-#include "../interface/ViewportInteraction.h"
 
 #include <deque>
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/Viewport.h>
+#include <openrct2-ui/interface/ViewportInteraction.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Context.h>
@@ -2359,9 +2361,10 @@ static Widget WindowSceneryBaseWidgets[] = {
             }
             else
             {
+                auto& im = GetInputManager();
                 if (!gSceneryCtrlPressed)
                 {
-                    if (InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_COPY_Z))
+                    if (im.IsModifierKeyPressed(ModifierKey::ctrl))
                     {
                         // CTRL pressed
                         constexpr auto flag = EnumsToFlags(
@@ -2379,7 +2382,7 @@ static Widget WindowSceneryBaseWidgets[] = {
                 }
                 else
                 {
-                    if (!(InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_COPY_Z)))
+                    if (!(im.IsModifierKeyPressed(ModifierKey::ctrl)))
                     {
                         // CTRL not pressed
                         gSceneryCtrlPressed = false;
@@ -2388,7 +2391,7 @@ static Widget WindowSceneryBaseWidgets[] = {
 
                 if (!gSceneryShiftPressed)
                 {
-                    if (InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_SHIFT_Z))
+                    if (im.IsModifierKeyPressed(ModifierKey::shift))
                     {
                         // SHIFT pressed
                         gSceneryShiftPressed = true;
@@ -2399,7 +2402,7 @@ static Widget WindowSceneryBaseWidgets[] = {
                 }
                 else
                 {
-                    if (InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_SHIFT_Z))
+                    if (im.IsModifierKeyPressed(ModifierKey::shift))
                     {
                         // SHIFT pressed
                         gSceneryShiftPressZOffset = (gSceneryShiftPressY - screenPos.y + 4);
diff --git a/src/openrct2-ui/windows/StaffList.cpp b/src/openrct2-ui/windows/StaffList.cpp
index fd3f1511b1..7744b3edd7 100644
--- a/src/openrct2-ui/windows/StaffList.cpp
+++ b/src/openrct2-ui/windows/StaffList.cpp
@@ -7,11 +7,12 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#include "../interface/ViewportQuery.h"
-
 #include <limits>
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/Viewport.h>
+#include <openrct2-ui/interface/ViewportQuery.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Context.h>
@@ -526,7 +527,7 @@ static Widget _staffListWidgets[] = {
         void HireNewMember(StaffType staffType, EntertainerCostume entertainerType)
         {
             bool autoPosition = Config::Get().general.AutoStaffPlacement;
-            if (gInputPlaceObjectModifier & PLACE_OBJECT_MODIFIER_SHIFT_Z)
+            if (GetInputManager().IsModifierKeyPressed(ModifierKey::shift))
             {
                 autoPosition = autoPosition ^ 1;
             }
diff --git a/src/openrct2-ui/windows/TileInspector.cpp b/src/openrct2-ui/windows/TileInspector.cpp
index d3fc4a4504..5daf9b1a00 100644
--- a/src/openrct2-ui/windows/TileInspector.cpp
+++ b/src/openrct2-ui/windows/TileInspector.cpp
@@ -7,11 +7,12 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#include "../UiStringIds.h"
-#include "../interface/Viewport.h"
-
 #include <iterator>
+#include <openrct2-ui/UiContext.h>
+#include <openrct2-ui/UiStringIds.h>
+#include <openrct2-ui/input/InputManager.h>
 #include <openrct2-ui/interface/Dropdown.h>
+#include <openrct2-ui/interface/Viewport.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>
 #include <openrct2/Game.h>
@@ -958,7 +959,7 @@ static uint64_t PageDisabledWidgets[] = {
             CoordsXY mapCoords;
             TileElement* clickedElement = nullptr;
             bool mouseOnViewport = false;
-            if (InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_COPY_Z))
+            if (GetInputManager().IsModifierKeyPressed(ModifierKey::ctrl))
             {
                 auto info = GetMapCoordinatesFromPos(screenCoords, ViewportInteractionFlags);
                 clickedElement = info.Element;
@@ -1772,7 +1773,7 @@ static uint64_t PageDisabledWidgets[] = {
 
         void UpdateSelectedTile(const ScreenCoordsXY& screenCoords)
         {
-            const bool ctrlIsHeldDown = InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER_COPY_Z);
+            const bool ctrlIsHeldDown = GetInputManager().IsModifierKeyPressed(ModifierKey::ctrl);
             // Mouse hasn't moved
             if (screenCoords.x == _toolMouseX && screenCoords.y == _toolMouseY && _toolCtrlDown == ctrlIsHeldDown)
                 return;
diff --git a/src/openrct2/Context.cpp b/src/openrct2/Context.cpp
index a59dcad317..6078d210fd 100644
--- a/src/openrct2/Context.cpp
+++ b/src/openrct2/Context.cpp
@@ -19,7 +19,6 @@
 #include "Game.h"
 #include "GameState.h"
 #include "GameStateSnapshots.h"
-#include "Input.h"
 #include "OpenRCT2.h"
 #include "ParkImporter.h"
 #include "PlatformEnvironment.h"
@@ -525,7 +524,6 @@ namespace OpenRCT2
                 LightFXInit();
             }
 
-            InputResetPlaceObjModifier();
             ViewportInitAll();
 
             ContextInit();
diff --git a/src/openrct2/Input.cpp b/src/openrct2/Input.cpp
index 32336ef4ea..4e26a5972b 100644
--- a/src/openrct2/Input.cpp
+++ b/src/openrct2/Input.cpp
@@ -14,7 +14,6 @@
 
 InputState _inputState;
 uint8_t _inputFlags;
-uint8_t gInputPlaceObjectModifier;
 
 WidgetRef gHoverWidget;
 WidgetRef gPressedWidget;
@@ -75,8 +74,3 @@ void ResetTooltipNotShown()
 {
     _tooltipNotShownTimeout = gCurrentRealTimeTicks + 50;
 }
-
-void InputResetPlaceObjModifier()
-{
-    gInputPlaceObjectModifier = PLACE_OBJECT_MODIFIER_NONE;
-}
diff --git a/src/openrct2/Input.h b/src/openrct2/Input.h
index 8be8c268ee..453abb8ef9 100644
--- a/src/openrct2/Input.h
+++ b/src/openrct2/Input.h
@@ -50,15 +50,6 @@ enum class InputState
     ScrollRight
 };
 
-enum PLACE_OBJECT_MODIFIER
-{
-    PLACE_OBJECT_MODIFIER_NONE = 0,
-    PLACE_OBJECT_MODIFIER_SHIFT_Z = (1 << 0),
-    PLACE_OBJECT_MODIFIER_COPY_Z = (1 << 1),
-};
-
-extern uint8_t gInputPlaceObjectModifier;
-
 extern WidgetRef gHoverWidget;
 extern WidgetRef gPressedWidget;
 
@@ -78,11 +69,7 @@ void InputSetFlag(INPUT_FLAGS flag, bool on);
 bool InputTestFlag(INPUT_FLAGS flag);
 void InputResetFlags();
 
-bool InputTestPlaceObjectModifier(PLACE_OBJECT_MODIFIER modifier);
-
 void InputSetState(InputState state);
 InputState InputGetState();
 
 void ResetTooltipNotShown();
-
-void InputResetPlaceObjModifier();