/**** 
* Classes
****/ 
var Bullet = Container.expand(function (startX, startY, targetX, targetY) {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = startX;
	self.y = startY;
	var speed = 10;
	var angle = Math.atan2(targetY - startY, targetX - startX);
	self.vx = Math.cos(angle) * speed;
	self.vy = Math.sin(angle) * speed;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
		if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			self.destroy();
		}
	};
});
var Heart = Container.expand(function () {
	var self = Container.call(this);
	var heartGraphics = self.attachAsset('heart', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.spawnHeart();
	var speed = 3;
	self.update = function () {
		var angle = Math.atan2(turret.y - self.y, turret.x - self.x);
		self.x += Math.cos(angle) * speed;
		self.y += Math.sin(angle) * speed;
		if (self.intersects(turret)) {
			lives++;
			livesText.setText(lives.toString());
			self.destroy();
			hearts.splice(hearts.indexOf(self), 1);
		}
	};
});
var Tabut = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.spawnZombie();
	var speed = 2;
	self.update = function () {
		var angle = Math.atan2(turret.y - self.y, turret.x - self.x);
		self.x += Math.cos(angle) * speed;
		self.y += Math.sin(angle) * speed;
		if (self.intersects(turret)) {
			LK.effects.flashScreen(0xff0000, 1000);
			self.destroy();
			zombies.splice(zombies.indexOf(self), 1);
			lives--;
			livesText.setText(lives.toString());
			if (lives <= 0) {
				LK.showGameOver();
			}
		}
	};
});
//<Write imports for supported plugins here>
//<Write entity 'classes' with empty functions for important behavior here>
var Turret = Container.expand(function () {
	var self = Container.call(this);
	var turretGraphics = self.attachAsset('turret', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.shoot = function (targetX, targetY) {
		if (!turretDisabled && shotsRemaining > 0) {
			var currentTime = Date.now();
			fireTimestamps.push(currentTime);
			// Remove timestamps older than 3 seconds
			fireTimestamps = fireTimestamps.filter(function (timestamp) {
				return currentTime - timestamp <= 3000;
			});
			if (fireTimestamps.length > 10) {
				turretDisabled = true;
				LK.setTimeout(function () {
					turretDisabled = false;
				}, 3000); // Disable turret for 3 seconds
			} else {
				shotsRemaining--;
				shotsText.setText(shotsRemaining.toString());
				var bullet = new Bullet(self.x, self.y, targetX, targetY);
				game.addChild(bullet);
				bullets.push(bullet);
			}
		}
	};
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.spawnZombie();
	var speed = 2;
	self.update = function () {
		var angle = Math.atan2(turret.y - self.y, turret.x - self.x);
		self.x += Math.cos(angle) * speed;
		self.y += Math.sin(angle) * speed;
		if (self.intersects(turret)) {
			LK.effects.flashScreen(0xff0000, 1000);
			self.destroy();
			zombies.splice(zombies.indexOf(self), 1);
			lives--;
			livesText.setText(lives.toString());
			if (lives <= 0) {
				LK.showGameOver();
			}
		}
	};
});
var Zombie3 = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie3', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.spawnZombie();
	var speed = 4;
	self.update = function () {
		var angle = Math.atan2(turret.y - self.y, turret.x - self.x);
		self.x += Math.cos(angle) * speed;
		self.y += Math.sin(angle) * speed;
		if (self.intersects(turret)) {
			LK.effects.flashScreen(0xff0000, 1000);
			self.destroy();
			zombies.splice(zombies.indexOf(self), 1);
			lives--;
			livesText.setText(lives.toString());
			if (lives <= 0) {
				LK.showGameOver();
			}
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background 
});

/**** 
* Game Code
****/ 
var shotsRemaining = 10; // Initialize shots remaining
LK.setInterval(function () {
	shotsRemaining = 10;
	shotsText.setText(shotsRemaining.toString());
}, 3000); // Reset shots every 3 seconds
var shotsText = new Text2(shotsRemaining.toString(), {
	size: 150,
	fill: 0xFFFFFF
});
shotsText.anchor.set(0, 1);
LK.gui.bottomLeft.addChild(shotsText);
var zombies = []; // Initialize zombies array
// Double the number of zombies spawned
for (var i = 0; i < zombies.length; i++) {
	var newZombie = new Zombie();
	newZombie.x = zombies[i].x;
	newZombie.y = zombies[i].y;
	game.addChild(newZombie);
	zombies.push(newZombie);
}
// Increase zombie speed by 100% 
//<Assets used in the game will automatically appear here>
var background = LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	scaleX: 2048 / 100,
	scaleY: 2732 / 100,
	x: 2048 / 2,
	y: 2732 / 2
});
game.addChild(background);
background.zIndex = -1; // Ensure background is behind other elements
Heart.prototype.spawnHeart = function () {
	this.x = Math.random() * 2048;
	this.y = Math.random() * 2732;
};
Zombie.prototype.spawnZombie = Tabut.prototype.spawnZombie = Zombie3.prototype.spawnZombie = function () {
	var side = Math.floor(Math.random() * 4);
	switch (side) {
		case 0:
			// top
			this.x = Math.random() * 2048;
			this.y = -181.78;
			break;
		case 1:
			// right
			this.x = 2048 + 120;
			this.y = Math.random() * 2732;
			break;
		case 2:
			// bottom
			this.x = Math.random() * 2048;
			this.y = 2732 + 181.78;
			break;
		case 3:
			// left
			this.x = -120;
			this.y = Math.random() * 2732;
			break;
	}
};
var turret = game.addChild(new Turret());
turret.x = 2048 / 2;
turret.y = 2732 / 2;
var bullets = [];
var fireTimestamps = []; // Track timestamps of each shot
var turretDisabled = false; // Track if turret is disabled
var zombies = []; // Initialize zombies array
var hearts = [];
game.down = function (x, y, obj) {
	turret.shoot(x, y);
};
var score = 0;
var lives = 3;
var livesText = new Text2(lives.toString(), {
	size: 150,
	fill: 0xFFFFFF
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
var scoreText = new Text2(score.toString(), {
	size: 150,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
game.update = function () {
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		for (var j = zombies.length - 1; j >= 0; j--) {
			if (bullets[i].intersects(zombies[j])) {
				bullets[i].destroy();
				bullets.splice(i, 1);
				if (zombies[j] instanceof Tabut) {
					var newZombie1 = new Zombie();
					newZombie1.x = zombies[j].x;
					newZombie1.y = zombies[j].y;
					game.addChild(newZombie1);
					zombies.push(newZombie1);
					var newZombie2 = new Zombie();
					newZombie2.x = zombies[j].x + 60; // Spawn the second zombie slightly to the right
					newZombie2.y = zombies[j].y;
					game.addChild(newZombie2);
					zombies.push(newZombie2);
				} else if (zombies[j] instanceof Zombie3) {
					score += 10;
					scoreText.setText(score.toString());
				} else {
					score += 5;
					scoreText.setText(score.toString());
				}
				// Play a random zombie sound
				var zombieSound = 'zombie' + Math.ceil(Math.random() * 3);
				LK.getSound(zombieSound).play();
				zombies[j].destroy();
				zombies.splice(j, 1);
				break;
			}
		}
	}
	for (var k = zombies.length - 1; k >= 0; k--) {
		zombies[k].update();
		for (var h = hearts.length - 1; h >= 0; h--) {
			var angle = Math.atan2(hearts[h].y - zombies[k].y, hearts[h].x - zombies[k].x);
			zombies[k].x += Math.cos(angle) * 2; // Zombies move towards the heart
			zombies[k].y += Math.sin(angle) * 2;
			if (zombies[k].intersects(hearts[h])) {
				hearts[h].destroy();
				hearts.splice(h, 1);
			}
		}
	}
	if (LK.ticks % 60 == 0) {
		var newZombie = new Zombie();
		game.addChild(newZombie);
		zombies.push(newZombie);
	}
	if (score >= 25 && LK.ticks % 480 == 0) {
		var newTabut = new Tabut();
		game.addChild(newTabut);
		zombies.push(newTabut);
	}
	if (score >= 100 && LK.ticks % 420 == 0) {
		var newZombie3 = new Zombie3();
		game.addChild(newZombie3);
		zombies.push(newZombie3);
	}
	if (LK.ticks % 3600 == 0) {
		var newHeart = new Heart();
		game.addChild(newHeart);
		hearts.push(newHeart);
		// Increase zombie speed by 60%
		zombies.forEach(function (zombie) {
			zombie.speed *= 2.0;
		});
	}
};

===================================================================
--- original.js
+++ change.js
@@ -185,8 +185,9 @@
 	x: 2048 / 2,
 	y: 2732 / 2
 });
 game.addChild(background);
+background.zIndex = -1; // Ensure background is behind other elements
 Heart.prototype.spawnHeart = function () {
 	this.x = Math.random() * 2048;
 	this.y = Math.random() * 2732;
 };