diff --git a/src/Common.c b/src/Common.c
index cfeef3b..5e4baa6 100644
--- a/src/Common.c
+++ b/src/Common.c
@@ -1 +1,6 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#include "Common.h"

WindowPtr MainWindow;
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#include "Common.h"
+
+WindowPtr MainWindow;
\ No newline at end of file
diff --git a/src/Common.h b/src/Common.h
index a1a09c7..c24cfca 100644
--- a/src/Common.h
+++ b/src/Common.h
@@ -1 +1,21 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#ifndef COMMON_H
#define COMMON_H

#include "stdbool.h"
#include "stdint.h"

#define min(a,b) ((a)<(b)?(a):(b))
#define max(a,b) ((a)>(b)?(a):(b))

#define bitRead(value, bit) (((value) >> (bit)) & 0x01)
#define bitSet(value, bit) ((value) |= (1UL << (bit)))
#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
#define bitToggle(value, bit) ((value) ^= (1UL << (bit)))
#define bitWrite(value, bit, bitValue) ((bitBalue) ? bitSet(value, bit) : bitClear(value, bit))

extern WindowPtr MainWindow;

#endif
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#ifndef COMMON_H
+#define COMMON_H
+
+#include "stdbool.h"
+#include "stdint.h"
+
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+
+#define bitRead(value, bit) (((value) >> (bit)) & 0x01)
+#define bitSet(value, bit) ((value) |= (1UL << (bit)))
+#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
+#define bitToggle(value, bit) ((value) ^= (1UL << (bit)))
+#define bitWrite(value, bit, bitValue) ((bitBalue) ? bitSet(value, bit) : bitClear(value, bit))
+
+extern WindowPtr MainWindow;
+
+#endif
diff --git a/src/GameEngine.c b/src/GameEngine.c
index 945413b..915c164 100644
--- a/src/GameEngine.c
+++ b/src/GameEngine.c
@@ -1 +1,64 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#include "Common.h"
#include "GameEngine.h"

const int8_t PuzzleSize = 5;

const uint8_t MaxStars = 3;
const uint8_t MaxHalfStars = 6;
const uint8_t MinHalfStars = 1;

const uint16_t PerfectScore = 300; // LevelCount * MaxHalfStars

void GameEngine_LoadLevel(GameEngine *engine, const int8_t level, const bool setB)
{
    engine->Level = Levels_BoundLevel(level);
    engine->Lights = Levels_GetLightsForLevel(engine->Level, setB);
    engine->Par = Levels_GetParForLevel(engine->Level);
    engine->Moves = 0;
}

bool GameEngine_GetLight(const GameEngine *engine, const int8_t x, const int8_t y)
{
    if (x >= 0 && x < PuzzleSize && y >= 0 && y < PuzzleSize)
    {
        return bitRead(engine->Lights, y * PuzzleSize + x);
    }

    return false;
}

bool GameEngine_IsCompleted(const GameEngine *engine)
{
    return engine->Lights == 0;
}

uint8_t GameEngine_GetHalfStars(const GameEngine *engine)
{
    uint8_t halfStarsLost = engine->Moves <= engine->Par ? 0 : max(0, (1 + engine->Moves - engine->Par) / 2);
    return max(MinHalfStars, MaxHalfStars - halfStarsLost);
}

void GameEngine_ToggleSingleLight(GameEngine *engine, const int8_t x, const int8_t y)
{
    if (x >= 0 && x < PuzzleSize && y >= 0 && y < PuzzleSize)
    {
        bitToggle(engine->Lights, y * PuzzleSize + x);
    }
}

void GameEngine_ToggleLights(GameEngine *engine, const int8_t x, const int8_t y)
{
    int8_t targetX = max(0, min(x, PuzzleSize - 1));
    int8_t targetY = max(0, min(y, PuzzleSize - 1));
    
    GameEngine_ToggleSingleLight(engine, targetX, targetY);
    GameEngine_ToggleSingleLight(engine, targetX + 1, targetY);
    GameEngine_ToggleSingleLight(engine, targetX, targetY + 1);
    GameEngine_ToggleSingleLight(engine, targetX - 1, targetY);
    GameEngine_ToggleSingleLight(engine, targetX, targetY - 1);
    
    engine->Moves++;    
}
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#include "Common.h"
+#include "GameEngine.h"
+
+const int8_t PuzzleSize = 5;
+
+const uint8_t MaxStars = 3;
+const uint8_t MaxHalfStars = 6;
+const uint8_t MinHalfStars = 1;
+
+const uint16_t PerfectScore = 300; // LevelCount * MaxHalfStars
+
+void GameEngine_LoadLevel(GameEngine *engine, const int8_t level, const bool setB)
+{
+    engine->Level = Levels_BoundLevel(level);
+    engine->Lights = Levels_GetLightsForLevel(engine->Level, setB);
+    engine->Par = Levels_GetParForLevel(engine->Level);
+    engine->Moves = 0;
+}
+
+bool GameEngine_GetLight(const GameEngine *engine, const int8_t x, const int8_t y)
+{
+    if (x >= 0 && x < PuzzleSize && y >= 0 && y < PuzzleSize)
+    {
+        return bitRead(engine->Lights, y * PuzzleSize + x);
+    }
+
+    return false;
+}
+
+bool GameEngine_IsCompleted(const GameEngine *engine)
+{
+    return engine->Lights == 0;
+}
+
+uint8_t GameEngine_GetHalfStars(const GameEngine *engine)
+{
+    uint8_t halfStarsLost = engine->Moves <= engine->Par ? 0 : max(0, (1 + engine->Moves - engine->Par) / 2);
+    return max(MinHalfStars, MaxHalfStars - halfStarsLost);
+}
+
+void GameEngine_ToggleSingleLight(GameEngine *engine, const int8_t x, const int8_t y)
+{
+    if (x >= 0 && x < PuzzleSize && y >= 0 && y < PuzzleSize)
+    {
+        bitToggle(engine->Lights, y * PuzzleSize + x);
+    }
+}
+
+void GameEngine_ToggleLights(GameEngine *engine, const int8_t x, const int8_t y)
+{
+    int8_t targetX = max(0, min(x, PuzzleSize - 1));
+    int8_t targetY = max(0, min(y, PuzzleSize - 1));
+    
+    GameEngine_ToggleSingleLight(engine, targetX, targetY);
+    GameEngine_ToggleSingleLight(engine, targetX + 1, targetY);
+    GameEngine_ToggleSingleLight(engine, targetX, targetY + 1);
+    GameEngine_ToggleSingleLight(engine, targetX - 1, targetY);
+    GameEngine_ToggleSingleLight(engine, targetX, targetY - 1);
+    
+    engine->Moves++;    
+}
diff --git a/src/GameEngine.h b/src/GameEngine.h
index 9851c5e..6206946 100644
--- a/src/GameEngine.h
+++ b/src/GameEngine.h
@@ -1 +1,35 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#ifndef GAMEENGINE_H
#define GAMEENGINE_H

#include "Levels.h"

extern const int8_t PuzzleSize;

extern const uint8_t MaxStars;
extern const uint8_t MaxHalfStars;
extern const uint8_t MinHalfStars;

extern const uint16_t PerfectScore;

typedef struct GameEngine
{
	int8_t Level;
    uint32_t Lights;
    uint16_t Par;
    uint16_t Moves;
} GameEngine;

void GameEngine_LoadLevel(GameEngine *engine, const int8_t level, const bool setB);

bool GameEngine_GetLight(const GameEngine *engine, const int8_t x, const int8_t y);

bool GameEngine_IsCompleted(const GameEngine *engine);

uint8_t GameEngine_GetHalfStars(const GameEngine *engine);

void GameEngine_ToggleLights(GameEngine *engine, const int8_t x, const int8_t y);

#endif
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#ifndef GAMEENGINE_H
+#define GAMEENGINE_H
+
+#include "Levels.h"
+
+extern const int8_t PuzzleSize;
+
+extern const uint8_t MaxStars;
+extern const uint8_t MaxHalfStars;
+extern const uint8_t MinHalfStars;
+
+extern const uint16_t PerfectScore;
+
+typedef struct GameEngine
+{
+	int8_t Level;
+    uint32_t Lights;
+    uint16_t Par;
+    uint16_t Moves;
+} GameEngine;
+
+void GameEngine_LoadLevel(GameEngine *engine, const int8_t level, const bool setB);
+
+bool GameEngine_GetLight(const GameEngine *engine, const int8_t x, const int8_t y);
+
+bool GameEngine_IsCompleted(const GameEngine *engine);
+
+uint8_t GameEngine_GetHalfStars(const GameEngine *engine);
+
+void GameEngine_ToggleLights(GameEngine *engine, const int8_t x, const int8_t y);
+
+#endif
diff --git a/src/Levels.c b/src/Levels.c
index 475367a..1d8d68a 100644
--- a/src/Levels.c
+++ b/src/Levels.c
@@ -1 +1,42 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#include "Common.h"
#include "Levels.h"

const int8_t LevelCount = 50;

const uint32_t Levels_LightsA[] = {
    0x0005400UL, 0x15A82B5UL, 0x0ADEF6AUL, 0x1B88360UL, 0x1BC5EEFUL, 0x0EAD400UL, 0x0F8C62FUL, 0x0AAA880UL, 0x07D3BEAUL,
    0x00039CEUL, 0x0EAD6B5UL, 0x0A76D5FUL, 0x022AA88UL, 0x0210800UL, 0x0010040UL, 0x1F08421UL, 0x1F71000UL, 0x0455544UL,
    0x1505415UL, 0x0004400UL, 0x021385EUL, 0x0E8C62EUL, 0x0467000UL, 0x12FC400UL, 0x1E79C61UL, 0x118FE31UL, 0x04211C4UL,
    0x1CE7000UL, 0x0000040UL, 0x0001000UL, 0x11CD671UL, 0x1F1111FUL, 0x198D508UL, 0x1EB4634UL, 0x00AC558UL, 0x11FC544UL,
    0x00739C0UL, 0x1555555UL, 0x0A60C2AUL, 0x0002800UL, 0x0421151UL, 0x0749D27UL, 0x0E11D71UL, 0x0E27F60UL, 0x157F0AEUL,
    0x0477DC4UL, 0x10917E4UL, 0x0089220UL, 0x1151151UL, 0x1FFFFFFUL,
};

const uint32_t Levels_LightsB[] = {
    0x1B06C1BUL, 0x1F2009FUL, 0x1F5115FUL, 0x11D822AUL, 0x0466CC4UL, 0x0AFD7EAUL, 0x158EE35UL, 0x0013800UL, 0x0531110UL,
    0x11AC6A0UL, 0x1F739DFUL, 0x1150151UL, 0x0E4394EUL, 0x093BD2FUL, 0x0EAD6B5UL, 0x0E4384EUL, 0x1F8D63FUL, 0x1505415UL,
    0x0AABAAAUL, 0x1500015UL, 0x1FBEFBFUL, 0x118FC9FUL, 0x1B56D5BUL, 0x1F8FD44UL, 0x118D771UL, 0x1FAFEBFUL, 0x0E2108EUL,
    0x1B77D4EUL, 0x0001000UL, 0x1101011UL, 0x1BD837BUL, 0x047440AUL, 0x1576DD5UL, 0x11CD671UL, 0x15AEEB5UL, 0x15AB884UL,
    0x1FAD6B5UL, 0x00739C0UL, 0x11FC544UL, 0x1555555UL, 0x11729D1UL, 0x0454544UL, 0x1502815UL, 0x0AFABEAUL, 0x1FEFEBFUL,
    0x1151151UL, 0x1F27C9FUL, 0x1F711DFUL, 0x04AFEA4UL, 0x1FFFFFFUL,
};

int8_t Levels_BoundLevel(const int8_t level)
{
    return max(level, 0) % LevelCount;
}

uint32_t Levels_GetLightsForLevel(const int8_t level, const bool setB)
{
    int8_t bLevel = Levels_BoundLevel(level);
    return setB ? Levels_LightsB[bLevel] : Levels_LightsA[bLevel];
}

uint16_t Levels_GetParForLevel(const int8_t level)
{
    return 6 + (Levels_BoundLevel(level) / 5);
}

\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#include "Common.h"
+#include "Levels.h"
+
+const int8_t LevelCount = 50;
+
+const uint32_t Levels_LightsA[] = {
+    0x0005400UL, 0x15A82B5UL, 0x0ADEF6AUL, 0x1B88360UL, 0x1BC5EEFUL, 0x0EAD400UL, 0x0F8C62FUL, 0x0AAA880UL, 0x07D3BEAUL,
+    0x00039CEUL, 0x0EAD6B5UL, 0x0A76D5FUL, 0x022AA88UL, 0x0210800UL, 0x0010040UL, 0x1F08421UL, 0x1F71000UL, 0x0455544UL,
+    0x1505415UL, 0x0004400UL, 0x021385EUL, 0x0E8C62EUL, 0x0467000UL, 0x12FC400UL, 0x1E79C61UL, 0x118FE31UL, 0x04211C4UL,
+    0x1CE7000UL, 0x0000040UL, 0x0001000UL, 0x11CD671UL, 0x1F1111FUL, 0x198D508UL, 0x1EB4634UL, 0x00AC558UL, 0x11FC544UL,
+    0x00739C0UL, 0x1555555UL, 0x0A60C2AUL, 0x0002800UL, 0x0421151UL, 0x0749D27UL, 0x0E11D71UL, 0x0E27F60UL, 0x157F0AEUL,
+    0x0477DC4UL, 0x10917E4UL, 0x0089220UL, 0x1151151UL, 0x1FFFFFFUL,
+};
+
+const uint32_t Levels_LightsB[] = {
+    0x1B06C1BUL, 0x1F2009FUL, 0x1F5115FUL, 0x11D822AUL, 0x0466CC4UL, 0x0AFD7EAUL, 0x158EE35UL, 0x0013800UL, 0x0531110UL,
+    0x11AC6A0UL, 0x1F739DFUL, 0x1150151UL, 0x0E4394EUL, 0x093BD2FUL, 0x0EAD6B5UL, 0x0E4384EUL, 0x1F8D63FUL, 0x1505415UL,
+    0x0AABAAAUL, 0x1500015UL, 0x1FBEFBFUL, 0x118FC9FUL, 0x1B56D5BUL, 0x1F8FD44UL, 0x118D771UL, 0x1FAFEBFUL, 0x0E2108EUL,
+    0x1B77D4EUL, 0x0001000UL, 0x1101011UL, 0x1BD837BUL, 0x047440AUL, 0x1576DD5UL, 0x11CD671UL, 0x15AEEB5UL, 0x15AB884UL,
+    0x1FAD6B5UL, 0x00739C0UL, 0x11FC544UL, 0x1555555UL, 0x11729D1UL, 0x0454544UL, 0x1502815UL, 0x0AFABEAUL, 0x1FEFEBFUL,
+    0x1151151UL, 0x1F27C9FUL, 0x1F711DFUL, 0x04AFEA4UL, 0x1FFFFFFUL,
+};
+
+int8_t Levels_BoundLevel(const int8_t level)
+{
+    return max(level, 0) % LevelCount;
+}
+
+uint32_t Levels_GetLightsForLevel(const int8_t level, const bool setB)
+{
+    int8_t bLevel = Levels_BoundLevel(level);
+    return setB ? Levels_LightsB[bLevel] : Levels_LightsA[bLevel];
+}
+
+uint16_t Levels_GetParForLevel(const int8_t level)
+{
+    return 6 + (Levels_BoundLevel(level) / 5);
+}
+
diff --git a/src/Levels.h b/src/Levels.h
index 143207e..2c3498f 100644
--- a/src/Levels.h
+++ b/src/Levels.h
@@ -1 +1,18 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#ifndef LEVELS_H
#define LEVELS_H

#include "stdint.h"
#include "stdbool.h"

extern const int8_t LevelCount;

int8_t Levels_BoundLevel(const int8_t level);

uint32_t Levels_GetLightsForLevel(const int8_t level, const bool setB);

uint16_t Levels_GetParForLevel(const int8_t level);

#endif
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#ifndef LEVELS_H
+#define LEVELS_H
+
+#include "stdint.h"
+#include "stdbool.h"
+
+extern const int8_t LevelCount;
+
+int8_t Levels_BoundLevel(const int8_t level);
+
+uint32_t Levels_GetLightsForLevel(const int8_t level, const bool setB);
+
+uint16_t Levels_GetParForLevel(const int8_t level);
+
+#endif
diff --git a/src/MacLO.c b/src/MacLO.c
index e2f8837..c4e1057 100644
--- a/src/MacLO.c
+++ b/src/MacLO.c
@@ -1 +1,36 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#include "Common.h"

void InitToolbox()
{
    InitGraf(&thePort);
    InitFonts();
    InitWindows();
    InitMenus();
    TEInit();
    InitDialogs(0L);
    FlushEvents(everyEvent, 0);
    InitCursor();
}

void InitMainWindow()
{
    MainWindow = GetNewWindow(128, 0L, (WindowPtr)-1L);
    SetPort(MainWindow);
    MoveTo(30, 50);
    DrawString("\pHello MacLO");
}

void EventLoop()
{
    while (!Button()) { }
}

void main(void)
{
    InitToolbox();
    InitMainWindow();
    EventLoop();
}
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#include "Common.h"
+
+void InitToolbox()
+{
+    InitGraf(&thePort);
+    InitFonts();
+    InitWindows();
+    InitMenus();
+    TEInit();
+    InitDialogs(0L);
+    FlushEvents(everyEvent, 0);
+    InitCursor();
+}
+
+void InitMainWindow()
+{
+    MainWindow = GetNewWindow(128, 0L, (WindowPtr)-1L);
+    SetPort(MainWindow);
+    MoveTo(30, 50);
+    DrawString("\pHello MacLO");
+}
+
+void EventLoop()
+{
+    while (!Button()) { }
+}
+
+void main(void)
+{
+    InitToolbox();
+    InitMainWindow();
+    EventLoop();
+}
diff --git a/src/stdbool.h b/src/stdbool.h
index b62b008..9152796 100644
--- a/src/stdbool.h
+++ b/src/stdbool.h
@@ -1 +1,13 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#ifndef STDBOOL_H
#define STDBOOL_H

#ifndef true
typedef char bool;
#define true 1
#define false 0
#endif

#endif
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#ifndef STDBOOL_H
+#define STDBOOL_H
+
+#ifndef true
+typedef char bool;
+#define true 1
+#define false 0
+#endif
+
+#endif
diff --git a/src/stdint.h b/src/stdint.h
index 49b451b..58d73fe 100644
--- a/src/stdint.h
+++ b/src/stdint.h
@@ -1 +1,41 @@
-// Copyright (c) Jon Thysell <http://jonthysell.com>
// Licensed under the MIT License.

#ifndef STDINT_H
#define STDINT_H

#include <limits.h>

#if !defined(UINT8_MAX) && defined(UCHAR_MAX) && (UCHAR_MAX) == 0xFFU
typedef unsigned char uint8_t;
typedef signed char int8_t;
#define UINT8_MAX UCHAR_MAX
#define INT8_MAX CHAR_MAX
#define INT8_MIN CHAR_MIN
#endif

#if !defined(UINT16_MAX) && defined(USHRT_MAX) && (USHRT_MAX) == 0xFFFFU
typedef unsigned short uint16_t;
typedef signed short int16_t;
#define UINT16_MAX USHRT_MAX
#define INT16_MAX SHRT_MAX
#define INT16_MIN SHRT_MIN
#endif

#if !defined(UINT32_MAX) && defined(UINT_MAX) && (UINT_MAX) == 0xFFFFFFFFUL
typedef unsigned int uint32_t;
typedef signed int int32_t;
#define UINT32_MAX UINT_MAX
#define INT32_MAX INT_MAX
#define INT32_MIN INT_MIN
#endif

#if !defined(UINT32_MAX) && defined(ULONG_MAX) && (ULONG_MAX) == 0xFFFFFFFFUL
typedef unsigned long uint32_t;
typedef signed long int32_t;
#define UINT32_MAX ULONG_MAX
#define INT32_MAX LONG_MAX
#define INT32_MIN LONG_MIN
#endif

#endif
\ No newline at end of file
+// Copyright (c) Jon Thysell <http://jonthysell.com>
+// Licensed under the MIT License.
+
+#ifndef STDINT_H
+#define STDINT_H
+
+#include <limits.h>
+
+#if !defined(UINT8_MAX) && defined(UCHAR_MAX) && (UCHAR_MAX) == 0xFFU
+typedef unsigned char uint8_t;
+typedef signed char int8_t;
+#define UINT8_MAX UCHAR_MAX
+#define INT8_MAX CHAR_MAX
+#define INT8_MIN CHAR_MIN
+#endif
+
+#if !defined(UINT16_MAX) && defined(USHRT_MAX) && (USHRT_MAX) == 0xFFFFU
+typedef unsigned short uint16_t;
+typedef signed short int16_t;
+#define UINT16_MAX USHRT_MAX
+#define INT16_MAX SHRT_MAX
+#define INT16_MIN SHRT_MIN
+#endif
+
+#if !defined(UINT32_MAX) && defined(UINT_MAX) && (UINT_MAX) == 0xFFFFFFFFUL
+typedef unsigned int uint32_t;
+typedef signed int int32_t;
+#define UINT32_MAX UINT_MAX
+#define INT32_MAX INT_MAX
+#define INT32_MIN INT_MIN
+#endif
+
+#if !defined(UINT32_MAX) && defined(ULONG_MAX) && (ULONG_MAX) == 0xFFFFFFFFUL
+typedef unsigned long uint32_t;
+typedef signed long int32_t;
+#define UINT32_MAX ULONG_MAX
+#define INT32_MAX LONG_MAX
+#define INT32_MIN LONG_MIN
+#endif
+
+#endif