diff --git a/src/Starfighter.cpp b/src/Starfighter.cpp
index a125f62..1f01c7d 100644
--- a/src/Starfighter.cpp
+++ b/src/Starfighter.cpp
@@ -26,7 +26,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 int main(int argc, char **argv)
 {
-	bool cheatAttempt;
+	int cheatAttempt;
 	int cheatCount;
 	int section;
 
@@ -52,7 +52,7 @@ int main(int argc, char **argv)
 
 	engine_init(); // Must do this first!
 
-	cheatAttempt = false;
+	cheatAttempt = 0;
 	cheatCount = 0;
 
 	if (argc > 1)
@@ -74,16 +74,16 @@ int main(int argc, char **argv)
 	for (int i = 1 ; i < argc ; i++)
 	{
 		if (strcmp(argv[i], "-cheat") == 0)
-			cheatAttempt = true;
+			cheatAttempt = 1;
 		if (strcmp(argv[i], "-noaudio") == 0)
 		{
 			printf("No Audio\n");
-			engine.useAudio = false;
+			engine.useAudio = 0;
 		}
 		if (strcmp(argv[i], "-mono") == 0)
 		{
 			printf("Mono sound output\n");
-			engine.useAudio = true;
+			engine.useAudio = 1;
 		}
 		if ((strcmp(argv[i], "humans") == 0) && (cheatCount == 0))
 			cheatCount = 1;
@@ -95,7 +95,7 @@ int main(int argc, char **argv)
 			(strcmp(argv[i], "humansdoitbetter") == 0))
 		{
 			printf("Humans do it better! Cheats enabled.\n");
-			engine.cheat = true;
+			engine.cheat = 1;
 		}
 	}
 
@@ -140,7 +140,7 @@ int main(int argc, char **argv)
 	game.difficulty = DIFFICULTY_NORMAL;
 	game_init();
 
-	while (true)
+	while (1)
 	{
 		switch (section)
 		{
diff --git a/src/alien.cpp b/src/alien.cpp
index bec1cb2..279f1ff 100644
--- a/src/alien.cpp
+++ b/src/alien.cpp
@@ -744,7 +744,7 @@ void aliens_init()
 
 	for (int i = 0 ; i < ALIEN_MAX ; i++)
 	{
-		aliens[i].active = false;
+		aliens[i].active = 0;
 		aliens[i].shield = -1;
 		aliens[i].flags = 0;
 	}
@@ -908,7 +908,7 @@ void aliens_init()
 			aliens[i].owner = &aliens[i];
 			aliens[i].target = &aliens[i];
 			aliens[i].face = rand() % 2;
-			aliens[i].active = true;
+			aliens[i].active = 1;
 
 			/*
 			we make 1000 attempts to place this enemy since it is required. If after
@@ -916,7 +916,7 @@ void aliens_init()
 			simply isn't going to happen and we will just exit the game. The chances
 			of this happening are very very low!
 			*/
-			while (true)
+			while (1)
 			{
 				placeAttempt++;
 
@@ -939,7 +939,7 @@ void aliens_init()
 
 			if (aliens[i].classDef == CD_CLOAKFIGHTER)
 			{
-				aliens[i].active = false;
+				aliens[i].active = 0;
 				aliens[i].maxShield = aliens[i].shield = 400;
 				aliens[i].flags &= ~FL_RUNSAWAY;
 				aliens[i].speed = 3;
@@ -947,12 +947,12 @@ void aliens_init()
 
 			if ((aliens[i].classDef == CD_MOBILE_RAY) && (i >= ALIEN_BOSS_PART3))
 			{
-				aliens[i].active = false;
+				aliens[i].active = 0;
 			}
 
 			if (aliens[i].classDef == CD_FIREFLY)
 			{
-				aliens[i].active = false;
+				aliens[i].active = 0;
 			}
 
 			if (aliens[i].classDef == CD_BARRIER)
@@ -1042,7 +1042,7 @@ void aliens_init()
 	}
 }
 
-bool alien_add()
+int alien_add()
 {
 	int index = alien_getFreeIndex();
 
@@ -1175,7 +1175,7 @@ bool alien_add()
 	delete[] alienArray;
 
 	aliens[index] = alien_defs[randEnemy];
-	aliens[index].active = true;
+	aliens[index].active = 1;
 	aliens[index].face = rand() % 2;
 	aliens[index].owner = &aliens[index]; // Most enemies will own themselves
 	aliens[index].target = &aliens[index];
@@ -1191,9 +1191,9 @@ bool alien_add()
 	{
 		if (alien_place(&aliens[index]))
 			break;
-		aliens[index].active = false;
+		aliens[index].active = 0;
 
-		return false;
+		return 0;
 	}
 
 	if (aliens[index].classDef == CD_CARGOSHIP)
@@ -1213,7 +1213,7 @@ bool alien_add()
 	if (game.area == MISN_ELLESH)
 		aliens[index].flags |= FL_HASMINIMUMSPEED;
 
-	return true;
+	return 1;
 }
 
 void alien_addDrone(object *hostAlien)
@@ -1224,7 +1224,7 @@ void alien_addDrone(object *hostAlien)
 		return;
 
 	aliens[index] = alien_defs[CD_DRONE];
-	aliens[index].active = true;
+	aliens[index].active = 1;
 	aliens[index].face = rand() % 2;
 	aliens[index].owner = &aliens[index]; // Most enemies will own themselves
 	aliens[index].target = &aliens[index];
@@ -1277,7 +1277,7 @@ void alien_addSmallAsteroid(object *hostAlien)
 
 	aliens[index].x = hostAlien->x;
 	aliens[index].y = hostAlien->y;
-	aliens[index].active = true;
+	aliens[index].active = 1;
 }
 
 void alien_addFriendly(int type)
@@ -1289,7 +1289,7 @@ void alien_addFriendly(int type)
 
 	aliens[type].owner = &aliens[type];
 	aliens[type].target = &aliens[type];
-	aliens[type].active = true;
+	aliens[type].active = 1;
 	aliens[type].x = RANDRANGE((screen->w / 2) - 150, (screen->w / 2) + 150);
 	aliens[type].y = RANDRANGE((screen->h / 2) - 150, (screen->h / 2) + 150);
 
@@ -1304,7 +1304,7 @@ void alien_addFriendly(int type)
 		aliens[type].flags |= FL_IMMORTAL;
 }
 
-bool alien_place(object *alien)
+int alien_place(object *alien)
 {
 	if (rand() % 2 == 0)
 		alien->x = RANDRANGE(screen->w, screen->w * 2);
@@ -1327,11 +1327,11 @@ bool alien_place(object *alien)
 		if ((aliens[i].owner != alien) && (aliens[i].shield > 0))
 		{
 			if (ship_collision(alien, &aliens[i]))
-				return false;
+				return 0;
 		}
 	}
 
-	return true;
+	return 1;
 }
 
 void alien_setAI(object *alien)
@@ -1640,12 +1640,12 @@ int alien_enemiesInFront(object *alien)
 
 void alien_move(object *alien)
 {
-	bool checkCollisions;
+	int checkCollisions;
 
 	if ((alien->flags & FL_LEAVESECTOR) || (alien->shield < 1))
-		checkCollisions = false;
+		checkCollisions = 0;
 	else
-		checkCollisions = true;
+		checkCollisions = 1;
 
 	if (alien->owner == alien)
 	{
@@ -1835,7 +1835,7 @@ void alien_destroy(object *alien, object *attacker)
 	}
 }
 
-void alien_hurt(object *alien, object *attacker, int damage, bool ion)
+void alien_hurt(object *alien, object *attacker, int damage, int ion)
 {
 	double run_chance;
 
diff --git a/src/alien.h b/src/alien.h
index f9da27c..b93f7d0 100644
--- a/src/alien.h
+++ b/src/alien.h
@@ -25,11 +25,11 @@ extern object aliens[ALIEN_MAX];
 
 void alien_defs_init();
 void aliens_init();
-bool alien_add();
+int alien_add();
 void alien_addDrone(object *hostAlien);
 void alien_addSmallAsteroid(object *hostAlien);
 void alien_addFriendly(int type);
-bool alien_place(object *alien);
+int alien_place(object *alien);
 void alien_setAI(object *alien);
 void alien_setKlineAttackMethod(object *alien);
 void alien_setKlineAI(object *alien);
@@ -38,6 +38,6 @@ int alien_checkTarget(object *alien);
 int alien_enemiesInFront(object *alien);
 void alien_move(object *alien);
 void alien_destroy(object *alien, object *attacker);
-void alien_hurt(object *alien, object *attacker, int damage, bool ion);
+void alien_hurt(object *alien, object *attacker, int damage, int ion);
 
 #endif
diff --git a/src/bullet.cpp b/src/bullet.cpp
index 21847c7..6e5d9d9 100644
--- a/src/bullet.cpp
+++ b/src/bullet.cpp
@@ -31,7 +31,7 @@ void bullet_add(object *theWeapon, object *attacker, int y, int dy)
 		game.shots++;
 
 	bullet->next = NULL;
-	bullet->active = true;
+	bullet->active = 1;
 	bullet->x = attacker->x + (attacker->image[0]->w / 2) -
 		(theWeapon->image[0]->w * attacker->face);
 	bullet->y = attacker->y + y;
@@ -182,7 +182,7 @@ object *bullet_getTarget(object *bullet)
 	return &aliens[i];
 }
 
-bool bullet_collision(object *bullet, object *ship)
+int bullet_collision(object *bullet, object *ship)
 {
 	float x0 = bullet->x;
 	float y0 = bullet->y;
diff --git a/src/bullet.h b/src/bullet.h
index 195eae0..2afdbc0 100644
--- a/src/bullet.h
+++ b/src/bullet.h
@@ -22,6 +22,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 void bullet_add(object *theWeapon, object *attacker, int y, int dy);
 object *bullet_getTarget(object *bullet);
-bool bullet_collision(object *bullet, object *ship);
+int bullet_collision(object *bullet, object *ship);
 
 #endif
diff --git a/src/cargo.cpp b/src/cargo.cpp
index cec8a67..ad10d80 100644
--- a/src/cargo.cpp
+++ b/src/cargo.cpp
@@ -25,7 +25,7 @@ void cargo_init()
 {
 	for (int i = 0 ; i < MAX_CARGO ; i++)
 	{
-		cargo[i].active = false;
+		cargo[i].active = 0;
 		cargo[i].owner = NULL;
 	}
 }
@@ -51,7 +51,7 @@ object *cargo_add(object *owner, int cargoType)
 	if (index == -1)
 		return NULL;
 
-	cargo[index].active = true;
+	cargo[index].active = 1;
 	cargo[index].owner = owner;
 	cargo[index].x = owner->x;
 	cargo[index].y = owner->y;
@@ -73,11 +73,11 @@ void cargo_becomeCollectable(int i)
 	}
 	else
 	{
-		aliens[ALIEN_PHOEBE].active = true;
+		aliens[ALIEN_PHOEBE].active = 1;
 		aliens[ALIEN_PHOEBE].x = cargo[i].x;
 		aliens[ALIEN_PHOEBE].y = cargo[i].y;
 		setRadioMessage(FS_PHOEBE, "Thanks! Watch out, WEAPCO! Phoebe's loose and she's ANGRY!", 1);
 	}
 
-	cargo[i].active = false;
+	cargo[i].active = 0;
 }
diff --git a/src/collectable.cpp b/src/collectable.cpp
index 6be040f..c4dc2d5 100644
--- a/src/collectable.cpp
+++ b/src/collectable.cpp
@@ -134,7 +134,7 @@ void collectable_add(float x, float y, int type, int value, int life)
 	collectables *collectable = new collectables;
 
 	collectable->next = NULL;
-	collectable->active = true;
+	collectable->active = 1;
 	collectable->x = x;
 	collectable->y = y;
 
@@ -206,7 +206,7 @@ void collectable_add(float x, float y, int type, int value, int life)
 	engine.collectableTail = collectable;
 }
 
-bool collectable_collision(collectables *collectable, object *ship)
+int collectable_collision(collectables *collectable, object *ship)
 {
 	float x0 = collectable->x;
 	float y0 = collectable->y;
diff --git a/src/collectable.h b/src/collectable.h
index e2451d8..5dc0f32 100644
--- a/src/collectable.h
+++ b/src/collectable.h
@@ -21,7 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define COLLECTABLE_H
 
 void collectable_add(float x, float y, int type, int value, int life);
-bool collectable_collision(collectables *collectable, object *ship);
+int collectable_collision(collectables *collectable, object *ship);
 void collectable_explode(collectables *collectable);
 
 #endif
diff --git a/src/cutscene.cpp b/src/cutscene.cpp
index c128c93..e9d23e0 100644
--- a/src/cutscene.cpp
+++ b/src/cutscene.cpp
@@ -54,7 +54,7 @@ void cutscene_init(int scene)
 		// particular reason for choosing this alien def.
 		aliens[i] = alien_defs[0];
 		aliens[i].face = 0;
-		aliens[i].active = false;
+		aliens[i].active = 0;
 	}
 
 	for (int i = 0 ; i < MAX_EVENTS ; i++)
@@ -74,7 +74,7 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w * 3 / 5;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 3.1;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			for (int i = 1 ; i < 7 ; i++)
 			{
@@ -82,7 +82,7 @@ void cutscene_init(int scene)
 				aliens[i].x = RANDRANGE(0, screen->w / 8);
 				aliens[i].y = RANDRANGE(50, screen->h - 50);
 				aliens[i].dx = 3;
-				aliens[i].active = true;
+				aliens[i].active = 1;
 			}
 
 			messages[0].face = -1;
@@ -108,7 +108,7 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w / 2;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 0.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			for (int i = 1 ; i < 15 ; i++)
 			{
@@ -116,7 +116,7 @@ void cutscene_init(int scene)
 				aliens[i].x = RANDRANGE(0, screen->w);
 				aliens[i].y = RANDRANGE(50, screen->h - 50);
 				aliens[i].dx = RANDRANGE(1, 3);
-				aliens[i].active = true;
+				aliens[i].active = 1;
 			}
 
 			messages[0].face = -1;
@@ -145,13 +145,13 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w / 4;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 1.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			aliens[1].image[0] = gfx_shipSprites[SS_SID];
 			aliens[1].x = screen->w / 4 - 50;
 			aliens[1].y = screen->h / 2 - 40;
 			aliens[1].dx = 1.5;
-			aliens[1].active = true;
+			aliens[1].active = 1;
 
 			messages[0].face = FS_SID;
 			strcpy(messages[0].message, "We're nearly ready to make the jump to Eyananth.");
@@ -179,19 +179,19 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w * 3 / 8;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 0.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			aliens[1].image[0] = gfx_shipSprites[SS_SID];
 			aliens[1].x = screen->w * 3 / 8 - 50;
 			aliens[1].y = screen->h / 2 - 40;
 			aliens[1].dx = 0.5;
-			aliens[1].active = true;
+			aliens[1].active = 1;
 
 			aliens[2].image[0] = gfx_shipSprites[SS_FRIEND];
 			aliens[2].x = screen->w * 3 / 8 - 50;
 			aliens[2].y = screen->h / 2 + 40;
 			aliens[2].dx = 0.5;
-			aliens[2].active = true;
+			aliens[2].active = 1;
 
 			messages[0].face = FS_PHOEBE;
 			strcpy(messages[0].message, "Nice head gear! You shop at the same place as me, huh?");
@@ -225,19 +225,19 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w / 4;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 1.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			aliens[1].image[0] = gfx_shipSprites[SS_SID];
 			aliens[1].x = screen->w / 4 - 50;
 			aliens[1].y = screen->h / 2 - 40;
 			aliens[1].dx = 1.5;
-			aliens[1].active = true;
+			aliens[1].active = 1;
 
 			aliens[2].image[0] = gfx_shipSprites[SS_FRIEND];
 			aliens[2].x = screen->w / 4 - 50;
 			aliens[2].y = screen->h / 2 + 40;
 			aliens[2].dx = 1.5;
-			aliens[2].active = true;
+			aliens[2].active = 1;
 
 			messages[0].face = FS_SID;
 			strcpy(messages[0].message, "What happened back there, Chris? The video feed was jammed.");
@@ -277,19 +277,19 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w * 3 / 8;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 0.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			aliens[1].image[0] = gfx_shipSprites[SS_SID];
 			aliens[1].x = screen->w * 3 / 8 - 50;
 			aliens[1].y = screen->h / 2 - 40;
 			aliens[1].dx = 0.5;
-			aliens[1].active = true;
+			aliens[1].active = 1;
 
 			aliens[2].image[0] = gfx_shipSprites[SS_FRIEND];
 			aliens[2].x = screen->w * 3 / 8 - 50;
 			aliens[2].y = screen->h / 2 + 40;
 			aliens[2].dx = 0.5;
-			aliens[2].active = true;
+			aliens[2].active = 1;
 
 			messages[0].face = FS_PHOEBE;
 			strcpy(messages[0].message, "Will she be okay?");
@@ -317,25 +317,25 @@ void cutscene_init(int scene)
 			aliens[0].x = screen->w / 4;
 			aliens[0].y = screen->h / 2;
 			aliens[0].dx = 1.5;
-			aliens[0].active = true;
+			aliens[0].active = 1;
 
 			aliens[1].image[0] = gfx_shipSprites[SS_SID];
 			aliens[1].x = screen->w / 4 - 50;
 			aliens[1].y = screen->h / 2 - 40;
 			aliens[1].dx = 1.5;
-			aliens[1].active = true;
+			aliens[1].active = 1;
 
 			aliens[2].image[0] = gfx_shipSprites[SS_FRIEND];
 			aliens[2].x = screen->w / 4 - 50;
 			aliens[2].y = screen->h / 2 + 40;
 			aliens[2].dx = 1.5;
-			aliens[2].active = true;
+			aliens[2].active = 1;
 
 			aliens[3].image[0] = gfx_shipSprites[SS_FRIEND];
 			aliens[3].x = screen->w / 4 - 90;
 			aliens[3].y = screen->h / 2;
 			aliens[3].dx = 1.5;
-			aliens[3].active = true;
+			aliens[3].active = 1;
 
 			messages[0].face = FS_CHRIS;
 			strcpy(messages[0].message, "Sorry folks, we just lost our bargaining chip.");
@@ -365,7 +365,7 @@ void cutscene_init(int scene)
 		aliens[i].engineY = (aliens[i].image[0]->h / 2);
 	}
 
-	bool showMessage = false;
+	int showMessage = 0;
 	int currentMessage = -1;
 	int timer = 60 * 4;
 
@@ -375,7 +375,7 @@ void cutscene_init(int scene)
 	
 	flushInput();
 
-	while (true)
+	while (1)
 	{
 		renderer_update();
 		screen_unBuffer();
diff --git a/src/engine.cpp b/src/engine.cpp
index d7cbc26..7253445 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -29,7 +29,7 @@ Engine engine;
 void engine_init()
 {
 	engine.musicVolume = 100;
-	engine.useAudio = true;
+	engine.useAudio = 1;
 
 	engine.maxAliens = 9;
 
@@ -66,13 +66,13 @@ void engine_init()
 	engine.counter = 0;
 	engine.seconds = 0;
 	engine.minutes = 0;
-	engine.paused = false;
+	engine.paused = 0;
 	engine.gameSection = SECTION_TITLE;
 
-	engine.cheat = false;
-	engine.cheatShield = false;
-	engine.cheatAmmo = false;
-	engine.cheatCash = false;
+	engine.cheat = 0;
+	engine.cheatShield = 0;
+	engine.cheatAmmo = 0;
+	engine.cheatCash = 0;
 }
 
 /*
@@ -237,7 +237,7 @@ void engine_setMode()
 		{
 			printf("Warning: Couldn't set 44100 Hz 16-bit stereo audio - Reason:\n%s\n", Mix_GetError());
 			printf("Sound and Music will be disabled\n");
-			engine.useAudio = false;
+			engine.useAudio = 0;
 		}
 	}
 
diff --git a/src/engine.h b/src/engine.h
index 5dc1b6d..30fc8b7 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -80,25 +80,25 @@ typedef struct Engine_ {
 	int allAliensDead;
 	int addAliens;
 
-	bool paused;
+	int paused;
 	int gameSection;
 
-	bool useAudio;
-	bool useSound;
-	bool useMusic;
-	bool fullScreen;
-	bool autoPause;
+	int useAudio;
+	int useSound;
+	int useMusic;
+	int fullScreen;
+	int autoPause;
 
 	char configDirectory[1024];
 	
 	char keyState[KEY_LAST];
 
-	bool cheat; // overall cheat
-	bool cheatShield;
-	bool cheatCash;
-	bool cheatAmmo;
-	bool cheatTime;
-	bool cheatCredits;
+	int cheat; // overall cheat
+	int cheatShield;
+	int cheatCash;
+	int cheatAmmo;
+	int cheatTime;
+	int cheatCredits;
 
 } Engine;
 
diff --git a/src/event.cpp b/src/event.cpp
index 035cc96..940c181 100644
--- a/src/event.cpp
+++ b/src/event.cpp
@@ -349,7 +349,7 @@ void events_check()
 				}
 				else
 				{
-					aliens[events[i].entity].active = true;
+					aliens[events[i].entity].active = 1;
 					aliens[events[i].entity].x = ((int)player.x +
 						RANDRANGE(400, 800));
 					aliens[events[i].entity].y = ((int)player.y +
diff --git a/src/explosion.cpp b/src/explosion.cpp
index 07b66ca..847f307 100644
--- a/src/explosion.cpp
+++ b/src/explosion.cpp
@@ -30,7 +30,7 @@ void explosion_add(float x, float y, int type)
 	object *explosion = new object;
 
 	explosion->next = NULL;
-	explosion->active = true;
+	explosion->active = 1;
 	explosion->x = x;
 	explosion->y = y;
 	explosion->thinktime = 28;
diff --git a/src/game.cpp b/src/game.cpp
index d22194f..21a05c3 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -75,8 +75,8 @@ void game_init()
 
 	if (!engine.useAudio)
 	{
-		engine.useSound = false;
-		engine.useMusic = false;
+		engine.useSound = 0;
+		engine.useMusic = 0;
 	}
 
 	game.cash = 0;
@@ -486,7 +486,7 @@ static void game_doCollectables()
 				updateMissionRequirements(M_COLLECT, collectable->type,
 					collectable->value);
 
-				collectable->active = false;
+				collectable->active = 0;
 				if (collectable->type != P_MINE)
 				{
 					setInfoLine(temp, FONT_WHITE);
@@ -508,7 +508,7 @@ static void game_doCollectables()
 
 		if (collectable->life < 1)
 		{
-			collectable->active = false;
+			collectable->active = 0;
 			if ((collectable->type == P_CARGO) ||
 					(collectable->type == P_ESCAPEPOD) ||
 					(collectable->type == P_SLAVES))
@@ -551,7 +551,7 @@ static void game_doBullets()
 	collectables *collectable;
 	collectables *prevCollectable;
 
-	bool okayToHit = false;
+	int okayToHit = 0;
 	int old_shield;
 	float homingMissileSpeed = 0;
 	int charger_num;
@@ -642,18 +642,18 @@ static void game_doBullets()
 				if ((aliens[i].shield < 1) || (!aliens[i].active))
 					continue;
 
-				okayToHit = false;
+				okayToHit = 0;
 
 				if ((bullet->flags & WF_FRIEND) && (aliens[i].flags & FL_WEAPCO))
-					okayToHit = true;
+					okayToHit = 1;
 				if ((bullet->flags & WF_WEAPCO) && (aliens[i].flags & FL_FRIEND))
-					okayToHit = true;
+					okayToHit = 1;
 				if ((bullet->id == WT_ROCKET) || (bullet->id == WT_LASER) ||
 						(bullet->id == WT_CHARGER))
-					okayToHit = true;
+					okayToHit = 1;
 
 				if (bullet->owner == aliens[i].owner)
-					okayToHit = false;
+					okayToHit = 0;
 
 				if (okayToHit)
 				{
@@ -690,7 +690,7 @@ static void game_doBullets()
 							bullet->damage -= old_shield;
 							if (bullet->damage <= 0)
 							{
-								bullet->active = false;
+								bullet->active = 0;
 								bullet->shield = 0;
 								audio_playSound(SFX_EXPLOSION, bullet->x, bullet->y);
 								for (int i = 0 ; i < 10 ; i++)
@@ -701,7 +701,7 @@ static void game_doBullets()
 						}
 						else
 						{
-							bullet->active = false;
+							bullet->active = 0;
 							bullet->shield = 0;
 						}
 
@@ -750,7 +750,7 @@ static void game_doBullets()
 						bullet->damage -= old_shield;
 						if (bullet->damage <= 0)
 						{
-							bullet->active = false;
+							bullet->active = 0;
 							bullet->shield = 0;
 							audio_playSound(SFX_EXPLOSION, bullet->x, bullet->y);
 							for (int i = 0 ; i < 10 ; i++)
@@ -760,7 +760,7 @@ static void game_doBullets()
 					}
 					else
 					{
-						bullet->active = false;
+						bullet->active = 0;
 						bullet->shield = 0;
 					}
 
@@ -783,12 +783,12 @@ static void game_doBullets()
 				{
 					if (bullet_collision(bullet, &cargo[j]))
 					{
-						bullet->active = false;
+						bullet->active = 0;
 						explosion_add(bullet->x, bullet->y, SP_SMALL_EXPLOSION);
 						audio_playSound(SFX_HIT, cargo[j].x, cargo[j].y);
 						if (cargo[j].collectType != P_PHOEBE)
 						{
-							cargo[j].active = false;
+							cargo[j].active = 0;
 							audio_playSound(SFX_EXPLOSION, cargo[j].x, cargo[j].y);
 							for (int i = 0 ; i < 10 ; i++)
 								explosion_add(cargo[j].x + RANDRANGE(-15, 15),
@@ -814,17 +814,17 @@ static void game_doBullets()
 			{
 				if (collectable_collision(collectable, bullet))
 				{
-					collectable->active = false;
+					collectable->active = 0;
 					
 					if (bullet->id != WT_CHARGER)
 					{
-						bullet->active = false;
+						bullet->active = 0;
 					}
 					else
 					{
 						bullet->shield--;
 						if (bullet->shield < 0)
-							bullet->active = false;
+							bullet->active = 0;
 					}
 
 					if (bullet->owner == &player)
@@ -862,7 +862,7 @@ static void game_doBullets()
 
 				player_checkShockDamage(bullet->x, bullet->y);
 			}
-			bullet->active = false;
+			bullet->active = 0;
 		}
 
 		if (bullet->active)
@@ -884,7 +884,7 @@ static void game_doAliens()
 	static float barrierLoop = 0;
 
 	int shapeToUse;
-	bool canFire;
+	int canFire;
 	int n;
 
 	barrierLoop += 0.2;
@@ -929,7 +929,7 @@ static void game_doAliens()
 					}
 				}
 
-				canFire = true; // The alien is allowed to fire
+				canFire = 1; // The alien is allowed to fire
 
 				LIMIT_ADD(aliens[i].thinktime, -1, 0, 250);
 
@@ -1009,7 +1009,7 @@ static void game_doAliens()
 					{
 						aliens[i].flags -= FL_LEAVESECTOR;
 						aliens[i].flags += FL_ESCAPED;
-						aliens[i].active = false;
+						aliens[i].active = 0;
 
 						if (aliens[i].classDef == CD_CLOAKFIGHTER)
 						{
@@ -1069,7 +1069,7 @@ static void game_doAliens()
 				}
 				else
 				{
-					canFire = false;
+					canFire = 0;
 				}
 
 				if (canFire)
@@ -1164,7 +1164,7 @@ static void game_doAliens()
 				}
 
 				if ((game.area == MISN_MARS) && (aliens[i].x < -60))
-					aliens[i].active = false;
+					aliens[i].active = 0;
 			}
 			else
 			{
@@ -1180,7 +1180,7 @@ static void game_doAliens()
 				}
 				if (aliens[i].shield < aliens[i].deathCounter)
 				{
-					aliens[i].active = false;
+					aliens[i].active = 0;
 					if ((aliens[i].classDef == CD_BOSS) ||
 							(aliens[i].owner == &aliens[ALIEN_BOSS]) ||
 							(aliens[i].flags & FL_FRIEND) ||
@@ -1286,7 +1286,7 @@ static void game_doPlayer()
 							{
 								ship_fireBullet(&player, 1);
 								player.ammo[1] = 0;
-								player_chargerFired = true;
+								player_chargerFired = 1;
 							}
 						}
 					}
@@ -1296,7 +1296,7 @@ static void game_doPlayer()
 					if (player.ammo[1] > 0)
 						ship_fireBullet(&player, 1);
 					player.ammo[1] = 0;
-					player_chargerFired = false;
+					player_chargerFired = 0;
 				}
 			}
 
@@ -1366,7 +1366,7 @@ static void game_doPlayer()
 
 			if (engine.keyState[KEY_PAUSE])
 			{
-				engine.paused = true;
+				engine.paused = 1;
 				engine.keyState[KEY_PAUSE] = 0;
 			}
 
@@ -1469,7 +1469,7 @@ static void game_doPlayer()
 		}
 		else
 		{
-			player.active = false;
+			player.active = 0;
 			player.shield--;
 			if (player.shield == -1)
 			{
@@ -1624,7 +1624,7 @@ void game_doExplosions()
 
 				if(explosion->thinktime < 1)
 				{
-					explosion->active = false;
+					explosion->active = 0;
 				}
 				else
 				{
@@ -2035,28 +2035,28 @@ Checked during the main game loop. When the game is paused
 it goes into a constant loop checking this routine. If escape is
 pressed, the game automatically ends and goes back to the title screen
 */
-static bool game_checkPauseRequest()
+static int game_checkPauseRequest()
 {
 	getPlayerInput();
 		
 	if (engine.keyState[KEY_ESCAPE])
 	{
-		engine.paused = false;
+		engine.paused = 0;
 		engine.done = 1;
 		player.shield = 0;
-		return true;
+		return 1;
 	}
 	
 	if (engine.keyState[KEY_PAUSE])
 	{
-		engine.paused = false;
+		engine.paused = 0;
 		engine.keyState[KEY_PAUSE] = 0;
 	}
 
-	return false;
+	return 0;
 }
 
-bool game_collision(float x0, float y0, int w0, int h0, float x2, float y2, int w1, int h1)
+int game_collision(float x0, float y0, int w0, int h0, float x2, float y2, int w1, int h1)
 {
 	float x1 = x0 + w0;
 	float y1 = y0 + h0;
@@ -2083,7 +2083,7 @@ int game_mainLoop()
 		game.hasWingMate1 = 1;
 
 	if (game.area == MISN_ELAMALE)
-		aliens[ALIEN_KLINE].active = false;
+		aliens[ALIEN_KLINE].active = 0;
 
 	for (int i = 0 ; i < engine.maxAliens ; i++)
 		alien_add();
@@ -2110,8 +2110,8 @@ int game_mainLoop()
 		case MISN_ELLESH:
 		case MISN_MARS:
 		case MISN_VENUS:
-			aliens[ALIEN_PHOEBE].active = false;
-			aliens[ALIEN_URSULA].active = false;
+			aliens[ALIEN_PHOEBE].active = 0;
+			aliens[ALIEN_URSULA].active = 0;
 			break;
 	}
 
@@ -2129,7 +2129,7 @@ int game_mainLoop()
 			aliens[ALIEN_KLINE] = alien_defs[CD_KLINE];
 			aliens[ALIEN_KLINE].owner = &aliens[ALIEN_KLINE];
 			aliens[ALIEN_KLINE].target = &player;
-			aliens[ALIEN_KLINE].active = true;
+			aliens[ALIEN_KLINE].active = 1;
 			aliens[ALIEN_KLINE].x = player.x + 1000;
 			aliens[ALIEN_KLINE].y = player.y;
 			player_setTarget(ALIEN_KLINE);
@@ -2143,7 +2143,7 @@ int game_mainLoop()
 				aliens[ALIEN_BOSS].owner = &aliens[ALIEN_BOSS];
 				aliens[ALIEN_BOSS].target = &aliens[ALIEN_BOSS];
 				aliens[ALIEN_BOSS].shield = 1000;
-				aliens[ALIEN_BOSS].active = true;
+				aliens[ALIEN_BOSS].active = 1;
 				aliens[ALIEN_BOSS].x = player.x - 1000;
 				aliens[ALIEN_BOSS].y = player.y;
 				player_setTarget(ALIEN_BOSS);
diff --git a/src/game.h b/src/game.h
index bee586d..28ac774 100644
--- a/src/game.h
+++ b/src/game.h
@@ -26,7 +26,7 @@ void game_init();
 void game_doStars();
 void game_doExplosions();
 void game_delayFrame();
-bool game_collision(float x0, float y0, int w0, int h0, float x2, float y2, int w1, int h1);
+int game_collision(float x0, float y0, int w0, int h0, float x2, float y2, int w1, int h1);
 int game_mainLoop();
 
 #endif
diff --git a/src/intermission.cpp b/src/intermission.cpp
index c554cec..18cc0b5 100644
--- a/src/intermission.cpp
+++ b/src/intermission.cpp
@@ -403,12 +403,12 @@ Spins the planets around the sun, spaced according to their Y value
 as defined in intermission_setSystemPlanets(). Moving the cursor over the planet
 will show their name and their current status
 */
-static bool intermission_showSystem(float x, float y, bool selectable)
+static int intermission_showSystem(float x, float y, int selectable)
 {
 	SDL_Rect r;
 	int planet = 0;
 	int planetSpace = systemPlanet[planet].y;
-	bool rtn = false;
+	int rtn = 0;
 
 	// Blit the sun
 	screen_blit(gfx_sprites[SP_SUN], 370, 220);
@@ -439,7 +439,7 @@ static bool intermission_showSystem(float x, float y, bool selectable)
 			{
 				game.destinationPlanet = planet;
 				strcpy(game.destinationName, systemPlanet[game.destinationPlanet].name);
-				rtn = true;
+				rtn = 1;
 				engine.keyState[KEY_FIRE] = 0;
 			}
 		}
@@ -1030,21 +1030,21 @@ static void intermission_doOptions(SDL_Surface *optionsSurface)
 	if ((engine.keyState[KEY_FIRE]))
 	{
 		if (game_collision(engine.cursor_x + 13, engine.cursor_y + 13, 6, 6, 417, 172, 45, 22))
-			engine.useSound = true;
+			engine.useSound = 1;
 
 		if (game_collision(engine.cursor_x + 13, engine.cursor_y + 13, 6, 6, 478, 172, 45, 22))
-			engine.useSound = false;
+			engine.useSound = 0;
 
 
 		if (game_collision(engine.cursor_x + 13, engine.cursor_y + 13, 6, 6, 417, 222, 45, 22))
 		{
-			engine.useMusic = true;
+			engine.useMusic = 1;
 			audio_playMusic("music/through_space.ogg", -1);
 		}
 
 		if (game_collision(engine.cursor_x + 13, engine.cursor_y + 13, 6, 6, 478, 222, 45, 22))
 		{
-			engine.useMusic = false;
+			engine.useMusic = 0;
 			audio_haltMusic();
 		}
 
@@ -1053,7 +1053,7 @@ static void intermission_doOptions(SDL_Surface *optionsSurface)
 			if (!engine.fullScreen)
 			{
 				SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
-				engine.fullScreen = true;
+				engine.fullScreen = 1;
 			}
 		}
 
@@ -1062,7 +1062,7 @@ static void intermission_doOptions(SDL_Surface *optionsSurface)
 			if (engine.fullScreen)
 			{
 				SDL_SetWindowFullscreen(window, 0);
-				engine.fullScreen = false;
+				engine.fullScreen = 0;
 			}
 		}
 
@@ -1091,12 +1091,12 @@ int intermission()
 
 	float sinX = 300;
 	float cosY = 300;
-	bool movePlanets = true;
+	int movePlanets = 1;
 	int saveSlot = -1;
 
 	int rtn = 0;
 
-	bool redrawBackground = true;
+	int redrawBackground = 1;
 
 	gfx_free();
 
@@ -1264,7 +1264,7 @@ int intermission()
 		if (redrawBackground)
 		{
 			screen_drawBackground();
-			redrawBackground = false;
+			redrawBackground = 0;
 		}
 		else
 		{
@@ -1352,7 +1352,7 @@ int intermission()
 					cosY += 0.01;
 				}
 
-				if (intermission_showSystem(sinX, cosY, true))
+				if (intermission_showSystem(sinX, cosY, 1))
 				{
 					sprintf(string, "Destination: %s", systemPlanet[game.destinationPlanet].name);
 					gfx_createTextObject(TS_DEST_PLANET, string, 550, 450, FONT_WHITE);
@@ -1392,7 +1392,7 @@ int intermission()
 				break;
 
 			case 8:
-				intermission_showSystem(sinX, cosY, false);
+				intermission_showSystem(sinX, cosY, 0);
 
 				screen_blit(systemPlanet[game.stationedPlanet].image, 150, 450);
 				screen_blitText(TS_CURRENT_PLANET);
@@ -1414,7 +1414,7 @@ int intermission()
 					gfx_createTextObject(TS_CURRENT_PLANET, string, 90, 450, FONT_WHITE);
 					intermission_updateCommsSurface(commsSurface);
 					section = 1;
-					redrawBackground = true;
+					redrawBackground = 1;
 					save(0);
 				}
 				else if (interceptionChance > 0)
@@ -1460,7 +1460,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 0;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1471,7 +1471,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 1;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1482,7 +1482,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 2;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1493,7 +1493,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 3;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1504,7 +1504,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 4;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1515,7 +1515,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 5;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1526,7 +1526,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 6;
 					engine.keyState[KEY_FIRE] = 0;
 				}
@@ -1537,7 +1537,7 @@ int intermission()
 
 				if ((engine.keyState[KEY_FIRE]))
 				{
-					redrawBackground = true;
+					redrawBackground = 1;
 					section = 7;
 					engine.keyState[KEY_FIRE] = 0;
 				}
diff --git a/src/missions.cpp b/src/missions.cpp
index db73bb6..bbadbc2 100644
--- a/src/missions.cpp
+++ b/src/missions.cpp
@@ -530,7 +530,7 @@ static int revealHiddenObjectives()
 		{
 			mission_killAllEnemies();
 			events_sync();
-			aliens[ALIEN_KLINE].active = true;
+			aliens[ALIEN_KLINE].active = 1;
 			aliens[ALIEN_KLINE].x = player.x + 1000;
 			aliens[ALIEN_KLINE].y = player.y;
 			aliens[ALIEN_KLINE].flags |= FL_IMMORTAL | FL_NOFIRE;
@@ -542,7 +542,7 @@ static int revealHiddenObjectives()
 	return allDone;
 }
 
-bool allMissionsCompleted()
+int allMissionsCompleted()
 {
 	for (int i = 0 ; i < 3 ; i++)
 	{
@@ -647,8 +647,8 @@ bool allMissionsCompleted()
 	}
 
 	int remaining;
-	bool add = false;
-	bool allDone = true;
+	int add = 0;
+	int allDone = 1;
 
 	// Zero objective list for a recount
 	currentMission.remainingObjectives1 = currentMission.remainingObjectives2 = 0;
@@ -661,12 +661,12 @@ bool allMissionsCompleted()
 			{
 				currentMission.remainingObjectives1++;
 				if (currentMission.primaryType[i] == M_DESTROY_ALL_TARGETS)
-					add = true;
-				allDone = false;
+					add = 1;
+				allDone = 0;
 			}
 
 			if (currentMission.completed1[i] < OB_INCOMPLETE)
-				return false;
+				return 0;
 		}
 		if (currentMission.secondaryType[i] != M_NONE)
 		{
@@ -674,8 +674,8 @@ bool allMissionsCompleted()
 			{
 				currentMission.remainingObjectives2++;
 				if (currentMission.secondaryType[i] == M_DESTROY_ALL_TARGETS)
-					add = true;
-				allDone = false;
+					add = 1;
+				allDone = 0;
 			}
 		}
 	}
@@ -693,17 +693,17 @@ bool allMissionsCompleted()
 	return allDone;
 }
 
-bool missionFailed()
+int missionFailed()
 {
 	for (int i = 0 ; i < 3 ; i++)
 	{
 		if (currentMission.completed1[i] < OB_INCOMPLETE)
 		{
-			return true;
+			return 1;
 		}
 	}
 
-	return false;
+	return 0;
 }
 
 static void drawBriefScreen()
@@ -834,7 +834,7 @@ void missionBriefScreen()
 		engine.keyState[KEY_ALTFIRE] = 0;
 		engine.keyState[KEY_ESCAPE] = 0;
 
-		while (true)
+		while (1)
 		{
 			game_delayFrame();
 			getPlayerInput();
@@ -940,7 +940,7 @@ void missionFinishedScreen()
 		engine.done = 0;
 		engine.keyState[KEY_FIRE] = 0;
 
-		while (true)
+		while (1)
 		{
 			game_delayFrame();
 			getPlayerInput();
diff --git a/src/missions.h b/src/missions.h
index 602cf2f..c806232 100644
--- a/src/missions.h
+++ b/src/missions.h
@@ -29,8 +29,8 @@ extern void updateSystemStatus();
 extern void setMission(int mission);
 extern void checkTimer();
 extern void updateMissionRequirements(int type, int id, int value);
-extern bool allMissionsCompleted();
-extern bool missionFailed();
+extern int allMissionsCompleted();
+extern int missionFailed();
 extern void missionBriefScreen();
 extern void missionFinishedScreen();
 extern void initMissions();
diff --git a/src/player.cpp b/src/player.cpp
index 62d1148..72082dd 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -20,14 +20,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "Starfighter.h"
 
 object player;
-bool player_chargerFired = false;
+int player_chargerFired = 0;
 
 /*
 Initialises the player for a new game.
 */
 void initPlayer()
 {
-	player.active = true;
+	player.active = 1;
 	player.x = screen->w / 2;
 	player.y = screen->h / 2;
 	player.speed = 2;
@@ -95,7 +95,7 @@ void player_checkShockDamage(float x, float y)
 
 void exitPlayer()
 {
-	player_chargerFired = false;
+	player_chargerFired = 0;
 
 	if ((player.weaponType[1] == W_CHARGER) || (player.weaponType[1] == W_LASER))
 		player.ammo[1] = 0;
@@ -188,7 +188,7 @@ void getPlayerInput()
 				engine.keyState[mapkey(engine.event.key.keysym.sym)] = 1;
 
 				if (engine.gameSection != SECTION_GAME)
-					engine.paused = false;
+					engine.paused = 0;
 
 				break;
 
@@ -233,17 +233,17 @@ void getPlayerInput()
 				break;
 
 			case SDL_JOYAXISMOTION:
-				static bool prevjoyup, prevjoydown, prevjoyleft, prevjoyright;
+				static int prevjoyup, prevjoydown, prevjoyleft, prevjoyright;
 				if (engine.event.jaxis.axis & 1) {
-					bool joyup = engine.event.jaxis.value < -16384;
-					bool joydown = engine.event.jaxis.value >= 16384;
+					int joyup = engine.event.jaxis.value < -16384;
+					int joydown = engine.event.jaxis.value >= 16384;
 					if(joyup != prevjoyup)
 						engine.keyState[KEY_UP] = prevjoyup = joyup;
 					if(joydown != prevjoydown)
 						engine.keyState[KEY_DOWN] = prevjoydown = joydown;
 				} else {
-					bool joyleft = engine.event.jaxis.value < -16384;
-					bool joyright = engine.event.jaxis.value >= 16384;
+					int joyleft = engine.event.jaxis.value < -16384;
+					int joyright = engine.event.jaxis.value >= 16384;
 					if(joyleft != prevjoyleft)
 						engine.keyState[KEY_LEFT] = prevjoyleft = joyleft;
 					if(joyright != prevjoyright)
@@ -254,7 +254,7 @@ void getPlayerInput()
 			case SDL_WINDOWEVENT:
 				if (engine.autoPause &&
 						(engine.event.window.event == SDL_WINDOWEVENT_FOCUS_LOST))
-					engine.paused = true;
+					engine.paused = 1;
 				break;
 		}
 
diff --git a/src/player.h b/src/player.h
index dd9e66c..bd40c1d 100644
--- a/src/player.h
+++ b/src/player.h
@@ -21,7 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define PLAYER_H
 
 extern object player;
-extern bool player_chargerFired;
+extern int player_chargerFired;
 
 extern void initPlayer();
 void player_setTarget(int index);
diff --git a/src/ship.cpp b/src/ship.cpp
index fb9d8fd..76f4eec 100644
--- a/src/ship.cpp
+++ b/src/ship.cpp
@@ -19,7 +19,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "Starfighter.h"
 
-bool ship_collision(object *ship, object *otherShip)
+int ship_collision(object *ship, object *otherShip)
 {
 	float x0 = ship->x;
 	float y0 = ship->y;
@@ -198,7 +198,7 @@ void ship_fireRay(object *ship)
 			if (game_collision(aliens[i].x, aliens[i].y, aliens[i].image[0]->w,
 					aliens[i].image[0]->h, ray.x, ray.y, ray.w, ray.h))
 			{
-				alien_hurt(&aliens[i], ship->owner, 1, false);
+				alien_hurt(&aliens[i], ship->owner, 1, 0);
 			}
 		}
 	}
diff --git a/src/ship.h b/src/ship.h
index 568cb52..f6371c2 100644
--- a/src/ship.h
+++ b/src/ship.h
@@ -18,7 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef SHIP_H
 #define SHIP_H
 
-bool ship_collision(object *ship, object *otherShip);
+int ship_collision(object *ship, object *otherShip);
 void ship_fireBullet(object *ship, int weaponType);
 void ship_fireRay(object *ship);
 
diff --git a/src/structs.h b/src/structs.h
index 2eded19..e34c55b 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -22,7 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 typedef struct object_ {
 
-	bool active;
+	int active;
 	int classDef; // Used by aliens to determine what they are
 	int AIType; // Type of articifial intelligence
 
@@ -99,7 +99,7 @@ typedef struct Star_ {
 
 typedef struct collectables_ {
 
-	bool active;
+	int active;
 	float x, y, dx, dy;
 	SDL_Surface *image;
 	int type; // What kind of collectable is it?
diff --git a/src/title.cpp b/src/title.cpp
index 1d9baa9..b5b1b6f 100644
--- a/src/title.cpp
+++ b/src/title.cpp
@@ -205,7 +205,7 @@ int doTitle()
 	char buildVersion[25];
 
 	int selectedOption = 1;
-	bool skip = false;
+	int skip = 0;
 	int listLength = 5; // menu list length
 	int menuType = MENU_MAIN;
 
@@ -411,7 +411,7 @@ int doTitle()
 					gfx_renderString(buildVersion, screen->w - 6 - strlen(buildVersion) * 9,
 						screen->h - 20, FONT_WHITE, 0, gfx_background);
 					screen_addBuffer(0, 0, screen->w, screen->h);
-					skip = true;
+					skip = 1;
 				}
 			}
 		}
@@ -422,7 +422,7 @@ int doTitle()
 		if (engine.cheatCredits)
 		{
 			doCredits();
-			engine.cheatCredits = false;
+			engine.cheatCredits = 0;
 		}
 
 		if ((engine.keyState[KEY_FIRE] || engine.keyState[KEY_ALTFIRE]))
@@ -438,7 +438,7 @@ int doTitle()
 				gfx_renderString(buildVersion, screen->w - 6 - strlen(buildVersion) * 9,
 					screen->h - 20, FONT_WHITE, 0, gfx_background);
 				screen_addBuffer(0, 560, 800, 40);
-				skip = true;
+				skip = 1;
 			}
 			else
 			{
@@ -631,7 +631,7 @@ void gameover()
 	flushInput();
 	engine.keyState[KEY_FIRE] = engine.keyState[KEY_ALTFIRE] = 0;
 
-	while (true)
+	while (1)
 	{
 		getPlayerInput();
 
@@ -701,7 +701,7 @@ void doCredits()
 	engine.keyState[KEY_ALTFIRE] = 0;
 	flushInput();
 
-	while (true)
+	while (1)
 	{
 		renderer_update();
 		screen_unBuffer();