/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.directionX = 0;
	self.directionY = 0;
	self.isDestroyed = false;
	self.update = function () {
		if (self.isDestroyed) return;
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
		// Remove if off screen
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			self.isDestroyed = true;
			self.shouldRemove = true;
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Add weapon visual
	var weapon = self.attachAsset('gun', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 1,
		scaleY: 1,
		y: -25
	});
	self.aimAtPoint = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var angle = Math.atan2(dy, dx) - Math.PI / 2;
		weapon.rotation = angle;
	};
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	// Choose random zombie type
	var zombieTypes = ['zombie1', 'zombie2', 'zombie3', 'zombie4'];
	var zombieType = zombieTypes[Math.floor(Math.random() * zombieTypes.length)];
	var zombieGraphics = self.attachAsset(zombieType, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Varying speeds based on zombie type
	var speedVariations = [1.5, 1.2, 1.8, 1.1];
	var typeIndex = zombieTypes.indexOf(zombieType);
	self.speed = speedVariations[typeIndex] + (Math.random() * 0.4 - 0.2); // Add small random variation
	self.targetX = 1024;
	self.targetY = 1366;
	self.isDestroyed = false;
	self.update = function () {
		if (self.isDestroyed) return;
		// Move toward center
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 5) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2F4F4F
});

/**** 
* Game Code
****/ 
// Game variables
var zombies = [];
var bullets = [];
var player;
var scoreTxt;
var waveLevel = 1;
var zombieSpawnRate = 120; // Spawn every 2 seconds initially
var zombieSpeed = 1.5;
var lastZombieSpawn = 0;
var lastShot = 0;
var shootCooldown = 15; // 15 frames between shots (4 shots per second)
// Create player at center
player = game.addChild(new Player());
player.x = 1024;
player.y = 1366;
// Create score display
scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 100;
// Wave level display
var waveTxt = new Text2('Wave 1', {
	size: 60,
	fill: 0xFFFF00
});
waveTxt.anchor.set(0, 0);
LK.gui.topRight.addChild(waveTxt);
waveTxt.x = -200;
waveTxt.y = 50;
// Shooting function
function shootBullet(targetX, targetY) {
	if (LK.ticks - lastShot < shootCooldown) return;
	var bullet = new Bullet();
	bullet.x = player.x;
	bullet.y = player.y;
	// Calculate direction
	var dx = targetX - player.x;
	var dy = targetY - player.y;
	var distance = Math.sqrt(dx * dx + dy * dy);
	bullet.directionX = dx / distance;
	bullet.directionY = dy / distance;
	bullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('gunShot').play();
	lastShot = LK.ticks;
}
// Touch/click controls
game.down = function (x, y, obj) {
	player.aimAtPoint(x, y);
	shootBullet(x, y);
};
function spawnZombie() {
	var zombie = new Zombie();
	// Random spawn from edges
	var edge = Math.floor(Math.random() * 4);
	switch (edge) {
		case 0:
			// Top
			zombie.x = Math.random() * 2048;
			zombie.y = -40;
			break;
		case 1:
			// Right
			zombie.x = 2088;
			zombie.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			zombie.x = Math.random() * 2048;
			zombie.y = 2772;
			break;
		case 3:
			// Left
			zombie.x = -40;
			zombie.y = Math.random() * 2732;
			break;
	}
	zombie.speed = zombieSpeed;
	zombies.push(zombie);
	game.addChild(zombie);
	LK.getSound('zombieSpawn').play();
}
function checkBulletCollisions() {
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.isDestroyed) continue;
		for (var j = 0; j < zombies.length; j++) {
			var zombie = zombies[j];
			if (zombie.isDestroyed) continue;
			var dx = bullet.x - zombie.x;
			var dy = bullet.y - zombie.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < 75) {
				// Hit zombie
				bullet.isDestroyed = true;
				bullet.shouldRemove = true;
				zombie.isDestroyed = true;
				LK.getSound('zombieHit').play();
				LK.setScore(LK.getScore() + 10);
				scoreTxt.setText(LK.getScore());
				// Create explosion effect
				var explosion = game.addChild(LK.getAsset('explosion', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: zombie.x,
					y: zombie.y,
					scaleX: 0.1,
					scaleY: 0.1
				}));
				// Animate explosion
				tween(explosion, {
					scaleX: 2,
					scaleY: 2,
					alpha: 0
				}, {
					duration: 300,
					easing: tween.easeOut,
					onFinish: function onFinish() {
						explosion.destroy();
					}
				});
				// Mark zombie for removal
				for (var k = 0; k < zombies.length; k++) {
					if (zombies[k] === zombie) {
						zombies[k].shouldRemove = true;
						break;
					}
				}
				break;
			}
		}
	}
}
function checkGameOver() {
	for (var i = 0; i < zombies.length; i++) {
		var zombie = zombies[i];
		if (zombie.isDestroyed) continue;
		var dx = zombie.x - player.x;
		var dy = zombie.y - player.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 50) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
}
function updateWave() {
	var currentScore = LK.getScore();
	var newWaveLevel = Math.floor(currentScore / 100) + 1;
	if (newWaveLevel > waveLevel) {
		waveLevel = newWaveLevel;
		waveTxt.setText('Wave ' + waveLevel);
		// Increase difficulty
		zombieSpawnRate = Math.max(30, zombieSpawnRate - 10);
		zombieSpeed += 0.3;
		LK.effects.flashScreen(0x00ff00, 500);
	}
}
game.update = function () {
	// Spawn zombies
	if (LK.ticks - lastZombieSpawn > zombieSpawnRate) {
		spawnZombie();
		lastZombieSpawn = LK.ticks;
	}
	// Clean up destroyed bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.shouldRemove) {
			bullet.destroy();
			bullets.splice(i, 1);
		}
	}
	// Clean up destroyed zombies
	for (var i = zombies.length - 1; i >= 0; i--) {
		var zombie = zombies[i];
		if (zombie.shouldRemove) {
			zombie.destroy();
			zombies.splice(i, 1);
		}
	}
	// Check bullet collisions
	checkBulletCollisions();
	// Check for game over
	checkGameOver();
	// Update wave progression
	updateWave();
};

===================================================================
--- original.js
+++ change.js
@@ -51,13 +51,19 @@
 	return self;
 });
 var Zombie = Container.expand(function () {
 	var self = Container.call(this);
-	var zombieGraphics = self.attachAsset('zombie', {
+	// Choose random zombie type
+	var zombieTypes = ['zombie1', 'zombie2', 'zombie3', 'zombie4'];
+	var zombieType = zombieTypes[Math.floor(Math.random() * zombieTypes.length)];
+	var zombieGraphics = self.attachAsset(zombieType, {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.speed = 1.5;
+	// Varying speeds based on zombie type
+	var speedVariations = [1.5, 1.2, 1.8, 1.1];
+	var typeIndex = zombieTypes.indexOf(zombieType);
+	self.speed = speedVariations[typeIndex] + (Math.random() * 0.4 - 0.2); // Add small random variation
 	self.targetX = 1024;
 	self.targetY = 1366;
 	self.isDestroyed = false;
 	self.update = function () {