diff --git a/src/GameWindow.c b/src/GameWindow.c
index 0355174..7e599f1 100644
--- a/src/GameWindow.c
+++ b/src/GameWindow.c
@@ -3,6 +3,8 @@
 
 #include "GameWindow.h"
 
+void GameWindow_DrawPlayfield(const GameWindow *pGameWindow);
+
 void GameWindow_Init(GameWindow *pGameWindow)
 {
     if (pGameWindow->Window != nil)
@@ -17,18 +19,99 @@ void GameWindow_Init(GameWindow *pGameWindow)
         ShowError("\pGameWindow resource WIND BaseResID missing!", true);
     }
     
+    // Setup rects
+    pGameWindow->PlayfieldRect.left = PlayfieldMargin;
+    pGameWindow->PlayfieldRect.top = PlayfieldMargin;
+    pGameWindow->PlayfieldRect.right = (2 * PlayfieldMargin) + (PuzzleSize * (LightSize + LightMargin)) - LightMargin;
+    pGameWindow->PlayfieldRect.bottom = (2 * PlayfieldMargin) + (PuzzleSize * (LightSize + LightMargin)) - LightMargin;;
+    
+    // Load first level
     GameEngine_LoadLevel(&(pGameWindow->Engine), 0, false);
+    
 }
 
-void GameWindow_Draw(GameWindow *pGameWindow)
+void GameWindow_Draw(const GameWindow *pGameWindow, Boolean fullRefresh)
 {
+    const Rect *pContentRect = &(pGameWindow->Window->portRect);
+    
     SetPort(pGameWindow->Window);
     
-    MoveTo(10, 20);
-    DrawString("\pHello MacLO");
+    if (fullRefresh)
+    {
+        // Fill background
+        ForeColor(blackColor);
+        PaintRect(pContentRect);
+    }
+    
+    GameWindow_DrawPlayfield(pGameWindow);
 }
 
-void GameWindow_Show(GameWindow *pGameWindow)
+void GameWindow_DrawPlayfield(const GameWindow *pGameWindow)
+{
+    int8_t r, c;
+    Rect lightRect;
+    
+    SetPort(pGameWindow->Window);
+    
+    // Draw lights
+    for (r = 0; r < PuzzleSize; r++)
+    {
+        lightRect.top = PlayfieldMargin + (r * (LightMargin + LightSize));
+        lightRect.bottom = lightRect.top + LightSize;
+        
+        for (c = 0; c < PuzzleSize; c++)
+        {
+            lightRect.left = PlayfieldMargin + (c * (LightMargin + LightSize));
+            lightRect.right = lightRect.left + LightSize;
+            
+            if (GameEngine_GetLight(&(pGameWindow->Engine), c, r))
+            {
+                // Draw ON light
+                ForeColor(whiteColor);
+                PaintRoundRect(&lightRect, LightCornerSize, LightCornerSize);
+            }
+            else
+            {
+                // Draw OFF light
+                ForeColor(blackColor);
+                PaintRoundRect(&lightRect, LightCornerSize, LightCornerSize);
+                ForeColor(whiteColor);
+                FrameRoundRect(&lightRect, LightCornerSize, LightCornerSize);
+            }
+        }
+    }
+}
+
+void GameWindow_Show(const GameWindow *pGameWindow)
 {
     ShowWindow(pGameWindow->Window);
 }
+
+void GameWindow_Click(GameWindow *pGameWindow, const Point *pPosition)
+{
+    int8_t r, c;
+    Rect lightRect;
+    
+    if (PtInRect(*pPosition, &(pGameWindow->PlayfieldRect)))
+    {
+        for (r = 0; r < PuzzleSize; r++)
+        {
+            lightRect.top = PlayfieldMargin + (r * (LightMargin + LightSize));
+            lightRect.bottom = lightRect.top + LightSize;
+        
+            for (c = 0; c < PuzzleSize; c++)
+            {
+                lightRect.left = PlayfieldMargin + (c * (LightMargin + LightSize));
+                lightRect.right = lightRect.left + LightSize;
+                
+                if (PtInRect(*pPosition, &lightRect))
+                {
+                    GameEngine_ToggleLights(&(pGameWindow->Engine), c, r);
+                    GameWindow_DrawPlayfield(pGameWindow);
+                    break;
+                }
+            }
+        }
+       
+    }
+}
diff --git a/src/GameWindow.h b/src/GameWindow.h
index 1c13da6..7679f64 100644
--- a/src/GameWindow.h
+++ b/src/GameWindow.h
@@ -7,14 +7,23 @@
 #include "MacCommon.h"
 #include "GameEngine.h"
 
+#define PlayfieldMargin 5
+#define LightMargin     10
+#define LightSize       50
+#define LightCornerSize 10
+
 typedef struct GameWindow
 {
-    WindowPtr Window;
+    WindowPtr  Window;
     GameEngine Engine;
+    Rect       PlayfieldRect;
 } GameWindow;
 
 void GameWindow_Init(GameWindow *pGameWindow);
-void GameWindow_Draw(GameWindow *pGameWindow);
-void GameWindow_Show(GameWindow *pGameWindow);
+
+void GameWindow_Draw(const GameWindow *pGameWindow, Boolean fullRefresh);
+void GameWindow_Show(const GameWindow *pGameWindow);
+
+void GameWindow_Click(GameWindow *pGameWindow, const Point *pPosition);
 
 #endif
diff --git a/src/MacLO.c b/src/MacLO.c
index 583c44c..4b5cf62 100644
--- a/src/MacLO.c
+++ b/src/MacLO.c
@@ -58,7 +58,7 @@ void MacLO_AppInit()
     
     // Setup the game window
     GameWindow_Init(&gGameWindow);
-    GameWindow_Draw(&gGameWindow);
+    GameWindow_Draw(&gGameWindow, true);
     GameWindow_Show(&gGameWindow);
 }
 
@@ -103,7 +103,7 @@ void MacLO_HandleUpdate(const EventRecord *pEvent)
     
     if (window == gGameWindow.Window)
     {
-        GameWindow_Draw(&gGameWindow);
+        GameWindow_Draw(&gGameWindow, true);
     }
     
     EndUpdate(window);
@@ -114,19 +114,25 @@ void MacLO_HandleMouseDown(const EventRecord *pEvent)
     WindowPtr window;
     long windowPart;
     long menuChoice;
+    Point mousePosition;
     
     windowPart = FindWindow(pEvent->where, &window);
+    mousePosition = pEvent->where;
     
     switch (windowPart)
     {
         case inMenuBar:
-            menuChoice = MenuSelect(pEvent->where);
+            menuChoice = MenuSelect(mousePosition);
             MacLO_HandleMenuChoice(menuChoice);
         case inSysWindow:
             SystemClick(pEvent, window);
             break;
         case inDrag:
-            DragWindow(window, pEvent->where, &((*GetGrayRgn())->rgnBBox));
+            DragWindow(window, mousePosition, &((*GetGrayRgn())->rgnBBox));
+            break;
+        case inContent:
+            GlobalToLocal(&mousePosition);
+            GameWindow_Click(&gGameWindow, &mousePosition);
             break;
     }
 }
diff --git a/src/MacLO.pi.bin b/src/MacLO.pi.bin
index 48b9363..743a81f 100644
Binary files a/src/MacLO.pi.bin and b/src/MacLO.pi.bin differ
diff --git a/src/MacLO.pi.rsrc.bin b/src/MacLO.pi.rsrc.bin
index 114a30e..7f5ddfb 100644
Binary files a/src/MacLO.pi.rsrc.bin and b/src/MacLO.pi.rsrc.bin differ