diff --git a/src/entities/boss/eyeDroidCommander.c b/src/entities/boss/eyeDroidCommander.c
index 2ae33fb..346e2ae 100644
--- a/src/entities/boss/eyeDroidCommander.c
+++ b/src/entities/boss/eyeDroidCommander.c
@@ -160,7 +160,7 @@ static void selectWeapon(void)
 	
 	b = (Boss*)self;
 	
-	if (world.bob->isOnGround || abs(self->y - world.bob->y) > 64)
+	if (world.bob->isOnGround || fabs(self->y - world.bob->y) > 64)
 	{
 		b->weaponType = WPN_AIMED_PISTOL;
 		b->shotsToFire = rrnd(1, 12);
diff --git a/src/entities/boss/tankCommander.c b/src/entities/boss/tankCommander.c
index 8125996..ac4914b 100644
--- a/src/entities/boss/tankCommander.c
+++ b/src/entities/boss/tankCommander.c
@@ -178,7 +178,7 @@ static void selectWeapon(void)
 	
 	b = (Boss*)self;
 	
-	if (abs(b->y - world.bob->y) > 64)
+	if (fabs(b->y - world.bob->y) > 64)
 	{
 		b->weaponType = WPN_AIMED_PISTOL;
 		b->shotsToFire = rrnd(4, 12);
diff --git a/src/entities/cannons/cannon.c b/src/entities/cannons/cannon.c
index 4c50d63..ec5f702 100644
--- a/src/entities/cannons/cannon.c
+++ b/src/entities/cannons/cannon.c
@@ -230,5 +230,5 @@ static void getCollisionBounds(SDL_Rect *r)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE;
 }
diff --git a/src/entities/evilBlobs/evilBlob.c b/src/entities/evilBlobs/evilBlob.c
index a46371a..9a8a35c 100644
--- a/src/entities/evilBlobs/evilBlob.c
+++ b/src/entities/evilBlobs/evilBlob.c
@@ -211,7 +211,7 @@ static void returnToStart(void)
 		u->dy = u->startY < u->y ? -1 : -1;
 	}
 
-	if (abs(u->startX - u->x) <= MAP_TILE_SIZE)
+	if (fabs(u->startX - u->x) <= MAP_TILE_SIZE)
 	{
 		u->returnToStartTimer = 0;
 	}
diff --git a/src/entities/evilBlobs/grenadeBlob.c b/src/entities/evilBlobs/grenadeBlob.c
index d7eea4b..c735e3d 100644
--- a/src/entities/evilBlobs/grenadeBlob.c
+++ b/src/entities/evilBlobs/grenadeBlob.c
@@ -72,5 +72,5 @@ static void preFire(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/evilBlobs/laserBlob.c b/src/entities/evilBlobs/laserBlob.c
index 5dd76ed..8cfcf6a 100644
--- a/src/entities/evilBlobs/laserBlob.c
+++ b/src/entities/evilBlobs/laserBlob.c
@@ -45,5 +45,5 @@ Entity *initLaserBlob(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/evilBlobs/machineGunBlob.c b/src/entities/evilBlobs/machineGunBlob.c
index 8f77d90..093a673 100644
--- a/src/entities/evilBlobs/machineGunBlob.c
+++ b/src/entities/evilBlobs/machineGunBlob.c
@@ -45,5 +45,5 @@ Entity *initMachineGunBlob(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/evilBlobs/plasmaBlob.c b/src/entities/evilBlobs/plasmaBlob.c
index bda4083..192615b 100644
--- a/src/entities/evilBlobs/plasmaBlob.c
+++ b/src/entities/evilBlobs/plasmaBlob.c
@@ -45,5 +45,5 @@ Entity *initPlasmaBlob(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/evilBlobs/spreadGunBlob.c b/src/entities/evilBlobs/spreadGunBlob.c
index 71d160d..f36f909 100644
--- a/src/entities/evilBlobs/spreadGunBlob.c
+++ b/src/entities/evilBlobs/spreadGunBlob.c
@@ -45,5 +45,5 @@ Entity *initSpreadGunBlob(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 5;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 5;
 }
diff --git a/src/entities/eyeDroids/grenadeDroid.c b/src/entities/eyeDroids/grenadeDroid.c
index 900d306..26a07d5 100644
--- a/src/entities/eyeDroids/grenadeDroid.c
+++ b/src/entities/eyeDroids/grenadeDroid.c
@@ -72,5 +72,5 @@ static void preFire(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/eyeDroids/laserDroid.c b/src/entities/eyeDroids/laserDroid.c
index 7513f77..483d9e6 100644
--- a/src/entities/eyeDroids/laserDroid.c
+++ b/src/entities/eyeDroids/laserDroid.c
@@ -45,5 +45,5 @@ Entity *initLaserDroid(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/eyeDroids/machineGunDroid.c b/src/entities/eyeDroids/machineGunDroid.c
index bcf0592..d61f747 100644
--- a/src/entities/eyeDroids/machineGunDroid.c
+++ b/src/entities/eyeDroids/machineGunDroid.c
@@ -45,5 +45,5 @@ Entity *initMachineGunDroid(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/eyeDroids/plasmaDroid.c b/src/entities/eyeDroids/plasmaDroid.c
index 07b48ee..cf978b1 100644
--- a/src/entities/eyeDroids/plasmaDroid.c
+++ b/src/entities/eyeDroids/plasmaDroid.c
@@ -45,5 +45,5 @@ Entity *initPlasmaDroid(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 2;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 2;
 }
diff --git a/src/entities/eyeDroids/spreadGunDroid.c b/src/entities/eyeDroids/spreadGunDroid.c
index 594d6bc..49d63a5 100644
--- a/src/entities/eyeDroids/spreadGunDroid.c
+++ b/src/entities/eyeDroids/spreadGunDroid.c
@@ -45,5 +45,5 @@ Entity *initSpreadGunDroid(void)
 
 static int canFire(Entity *target)
 {
-	return abs(target->y - self->y) <= MAP_TILE_SIZE * 5;
+	return fabs(target->y - self->y) <= MAP_TILE_SIZE * 5;
 }
diff --git a/src/entities/structures/cardReader.c b/src/entities/structures/cardReader.c
index 0b59fc0..82742a8 100644
--- a/src/entities/structures/cardReader.c
+++ b/src/entities/structures/cardReader.c
@@ -22,6 +22,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 static void init(void);
 static void tick(void);
+static void activate(int active);
 static void touch(Entity *other);
 static void load(cJSON *root);
 static void save(cJSON *root);
@@ -42,6 +43,7 @@ Entity *initCardReader(void)
 	
 	s->tick = tick;
 	s->init = init;
+	s->activate = activate;
 	s->touch = touch;
 	s->load = load;
 	s->save = save;
@@ -110,6 +112,18 @@ static void touch(Entity *other)
 	}
 }
 
+static void activate(int active)
+{
+	Structure *s;
+	
+	s = (Structure*)self;
+
+	s->active = 1;
+	s->sprite[FACING_LEFT] = s->sprite[FACING_RIGHT] = s->sprite[FACING_DIE] = getSprite("CardReader");
+	s->spriteTime = 0;
+	s->spriteFrame = 0;
+}
+
 static void load(cJSON *root)
 {
 	Structure *s;
diff --git a/src/entities/structures/door.c b/src/entities/structures/door.c
index 2acab1d..76e2cfd 100644
--- a/src/entities/structures/door.c
+++ b/src/entities/structures/door.c
@@ -138,7 +138,7 @@ static void tick(void)
 		s->dx *= s->speed;
 		s->dy *= s->speed;
 
-		if (abs(s->x - s->tx) < s->speed && abs(s->y - s->ty) < s->speed)
+		if (fabs(s->x - s->tx) < s->speed && fabs(s->y - s->ty) < s->speed)
 		{
 			s->x = s->tx;
 			s->y = s->ty;
@@ -153,7 +153,7 @@ static void tick(void)
 		s->dx *= s->speed;
 		s->dy *= s->speed;
 
-		if (abs(s->x - s->closedX) < s->speed && abs(self->y - s->closedY) < s->speed)
+		if (fabs(s->x - s->closedX) < s->speed && fabs(self->y - s->closedY) < s->speed)
 		{
 			s->x = s->closedX;
 			s->y = s->closedY;
diff --git a/src/entities/structures/lift.c b/src/entities/structures/lift.c
index 3dac8e0..85cce24 100644
--- a/src/entities/structures/lift.c
+++ b/src/entities/structures/lift.c
@@ -87,7 +87,7 @@ static void action(void)
 			s->dx *= s->speed;
 			s->dy *= s->speed;
 
-			if (abs(s->x - s->startX) < s->speed && abs(s->y - s->startY) < s->speed)
+			if (fabs(s->x - s->startX) < s->speed && fabs(s->y - s->startY) < s->speed)
 			{
 				s->x = s->startX;
 				s->y = s->startY;
@@ -103,7 +103,7 @@ static void action(void)
 			s->dx *= s->speed;
 			s->dy *= s->speed;
 
-			if (abs(s->x - s->tx) < s->speed && abs(s->y - s->ty) < s->speed)
+			if (fabs(s->x - s->tx) < s->speed && fabs(s->y - s->ty) < s->speed)
 			{
 				s->x = s->tx;
 				s->y = s->ty;
diff --git a/src/system/input.c b/src/system/input.c
index accdced..bde6b14 100644
--- a/src/system/input.c
+++ b/src/system/input.c
@@ -26,7 +26,7 @@ void initInput(void)
 
 static void doKeyDown(SDL_KeyboardEvent *event)
 {
-	if (event->keysym.scancode >= 0 && event->keysym.scancode < MAX_KEYBOARD_KEYS && event->repeat == 0)
+	if (event->keysym.scancode < MAX_KEYBOARD_KEYS && event->repeat == 0)
 	{
 		app.keyboard[event->keysym.scancode] = 1;
 
@@ -36,7 +36,7 @@ static void doKeyDown(SDL_KeyboardEvent *event)
 
 static void doKeyUp(SDL_KeyboardEvent *event)
 {
-	if (event->keysym.scancode >= 0 && event->keysym.scancode < MAX_KEYBOARD_KEYS)
+	if (event->keysym.scancode < MAX_KEYBOARD_KEYS)
 	{
 		app.keyboard[event->keysym.scancode] = 0;
 	}
diff --git a/src/world/camera.c b/src/world/camera.c
index fe93da4..3d1afd7 100644
--- a/src/world/camera.c
+++ b/src/world/camera.c
@@ -43,8 +43,8 @@ float cameraChase(Entity *e, int maxSpeed)
 	tx = e->x - (SCREEN_WIDTH / 2);
 	ty = e->y - (SCREEN_HEIGHT / 2);
 
-	diffX = abs(tx - x);
-	diffY = abs(ty - y);
+	diffX = fabs(tx - x);
+	diffY = fabs(ty - y);
 
 	dist = MAX(diffX, diffY);
 
diff --git a/src/world/entities.c b/src/world/entities.c
index bb16e65..1e70874 100644
--- a/src/world/entities.c
+++ b/src/world/entities.c
@@ -961,8 +961,8 @@ static void handleTeleport(void)
 {
 	float diffX, diffY;
 	
-	diffX = abs(self->x - self->tx) / 20;
-	diffY = abs(self->y - self->ty) / 20;
+	diffX = fabs(self->x - self->tx) / 20;
+	diffY = fabs(self->y - self->ty) / 20;
 
 	addTeleportStar(self->x + rand() % self->w, self->y + rand() % self->h);
 
diff --git a/src/world/triggers.c b/src/world/triggers.c
index 63f84b1..aab7819 100644
--- a/src/world/triggers.c
+++ b/src/world/triggers.c
@@ -34,7 +34,7 @@ void doLocationTriggers(void)
 			{
 				activateEntities(t->targetNames, 1);
 
-				if (t->message != NULL)
+				if (strlen(t->message) > 0)
 				{
 					setGameplayMessage(MSG_GAMEPLAY, t->message);
 				}
@@ -66,7 +66,7 @@ void fireTriggers(char *name)
 		{
 			activateEntities(t->targetNames, 1);
 
-			if (t->message != NULL)
+			if (strlen(t->message) > 0)
 			{
 				setGameplayMessage(MSG_GAMEPLAY, t->message);
 			}
diff --git a/src/world/world.c b/src/world/world.c
index 94d2ba5..ff3ed4f 100644
--- a/src/world/world.c
+++ b/src/world/world.c
@@ -572,9 +572,6 @@ static void doGameOver(void)
 	{
 		loadMusic("music/Sadness.ogg");
 		playMusic(0);
-	}
-	else if (world.gameOverTimer == -FPS * 3)
-	{
 		showWidgetGroup("gameOver");
 	}