/**** 
* 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 = 12;
	self.directionX = 0;
	self.directionY = 0;
	self.update = function () {
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
	};
	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 to player
	var weaponGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.5,
		scaleY: 1.5
	});
	weaponGraphics.x = 25; // Position weapon to the right of player
	weaponGraphics.y = 0;
	self.speed = 4;
	self.health = 1;
	self.lastShootTime = 0;
	self.shootInterval = 500; // milliseconds
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.health = 1;
	self.update = function () {
		if (player) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				self.x += dx / distance * self.speed;
				self.y += dy / distance * self.speed;
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2E2E2E
});

/**** 
* Game Code
****/ 
// Game variables
var player;
var zombies = [];
var bullets = [];
var dragNode = null;
var gameTime = 0;
var zombieSpawnRate = 50; // frames between spawns
var zombieSpeed = 4;
var zombiesKilled = 0;
var waveNumber = 1;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var waveTxt = new Text2('Wave: 1', {
	size: 50,
	fill: 0xFFFFFF
});
waveTxt.anchor.set(0, 0);
waveTxt.x = 20;
waveTxt.y = 20;
LK.gui.topLeft.addChild(waveTxt);
var timeTxt = new Text2('Time: 0s', {
	size: 50,
	fill: 0xFFFFFF
});
timeTxt.anchor.set(1, 0);
timeTxt.x = -20;
timeTxt.y = 20;
LK.gui.topRight.addChild(timeTxt);
// Initialize player
player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 / 2;
// Helper functions
function spawnZombie() {
	var zombie = new Zombie();
	var side = Math.floor(Math.random() * 4);
	switch (side) {
		case 0:
			// top
			zombie.x = Math.random() * 2048;
			zombie.y = -50;
			break;
		case 1:
			// right
			zombie.x = 2048 + 50;
			zombie.y = Math.random() * 2732;
			break;
		case 2:
			// bottom
			zombie.x = Math.random() * 2048;
			zombie.y = 2732 + 50;
			break;
		case 3:
			// left
			zombie.x = -50;
			zombie.y = Math.random() * 2732;
			break;
	}
	zombie.speed = zombieSpeed;
	zombies.push(zombie);
	game.addChild(zombie);
}
function findNearestZombie() {
	var nearestZombie = null;
	var nearestDistance = Infinity;
	for (var i = 0; i < zombies.length; i++) {
		var zombie = zombies[i];
		var dx = zombie.x - player.x;
		var dy = zombie.y - player.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < nearestDistance) {
			nearestDistance = distance;
			nearestZombie = zombie;
		}
	}
	return nearestZombie;
}
function shootBullet() {
	var target = findNearestZombie();
	if (!target) return;
	var bullet = new Bullet();
	bullet.x = player.x;
	bullet.y = player.y;
	// Calculate zombie's movement direction
	var zombieDx = player.x - target.x;
	var zombieDy = player.y - target.y;
	var zombieDistance = Math.sqrt(zombieDx * zombieDx + zombieDy * zombieDy);
	var zombieDirectionX = zombieDistance > 0 ? zombieDx / zombieDistance : 0;
	var zombieDirectionY = zombieDistance > 0 ? zombieDy / zombieDistance : 0;
	// Predict where zombie will be
	var timeToTarget = zombieDistance / bullet.speed;
	var predictedX = target.x + zombieDirectionX * target.speed * timeToTarget;
	var predictedY = target.y + zombieDirectionY * target.speed * timeToTarget;
	// Aim at predicted position
	var dx = predictedX - player.x;
	var dy = predictedY - player.y;
	var distance = Math.sqrt(dx * dx + dy * dy);
	if (distance > 0) {
		bullet.directionX = dx / distance;
		bullet.directionY = dy / distance;
	}
	bullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot').play();
}
function updateDifficulty() {
	waveNumber = Math.floor(gameTime / 1200) + 1; // New wave every 20 seconds
	zombieSpawnRate = Math.max(15, 50 - waveNumber * 8);
	zombieSpeed = 4 + (waveNumber - 1) * 1.2;
	waveTxt.setText('Wave: ' + waveNumber);
}
// Event handlers
function handleMove(x, y, obj) {
	if (dragNode) {
		// Keep player within screen bounds
		dragNode.x = Math.max(30, Math.min(2048 - 30, x));
		dragNode.y = Math.max(30, Math.min(2732 - 30, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = player;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game loop
game.update = function () {
	gameTime++;
	// Update UI
	timeTxt.setText('Time: ' + Math.floor(gameTime / 60) + 's');
	// Update difficulty
	updateDifficulty();
	// Spawn zombies
	if (gameTime % zombieSpawnRate === 0) {
		spawnZombie();
		// Spawn additional zombies in later waves
		if (waveNumber >= 2 && gameTime % (zombieSpawnRate * 2) === 0) {
			spawnZombie();
		}
		if (waveNumber >= 3 && gameTime % (zombieSpawnRate * 3) === 0) {
			spawnZombie();
		}
		if (waveNumber >= 4 && gameTime % (zombieSpawnRate * 4) === 0) {
			spawnZombie();
		}
	}
	// Auto-shoot
	if (gameTime % 60 === 0) {
		// Shoot every 1 second
		shootBullet();
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		// Remove bullets that are off screen
		if (bullet.x < -100 || bullet.x > 2148 || bullet.y < -100 || bullet.y > 2832) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet-zombie collisions
		for (var j = zombies.length - 1; j >= 0; j--) {
			var zombie = zombies[j];
			if (bullet.intersects(zombie)) {
				// Zombie hit
				LK.getSound('zombieHit').play();
				zombie.destroy();
				zombies.splice(j, 1);
				bullet.destroy();
				bullets.splice(i, 1);
				zombiesKilled++;
				LK.setScore(zombiesKilled * 10 + Math.floor(gameTime / 60));
				scoreTxt.setText('Score: ' + LK.getScore());
				// Flash effect
				LK.effects.flashObject(zombie, 0xFF0000, 200);
				break;
			}
		}
	}
	// Check player-zombie collisions
	for (var k = 0; k < zombies.length; k++) {
		var zombie = zombies[k];
		if (player.intersects(zombie)) {
			// Player hit - game over
			LK.effects.flashScreen(0xFF0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Remove zombies that are too far off screen (cleanup)
	for (var l = zombies.length - 1; l >= 0; l--) {
		var zombie = zombies[l];
		if (zombie.x < -200 || zombie.x > 2248 || zombie.y < -200 || zombie.y > 2932) {
			zombie.destroy();
			zombies.splice(l, 1);
		}
	}
};
// Start background music
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -161,10 +161,21 @@
 	if (!target) return;
 	var bullet = new Bullet();
 	bullet.x = player.x;
 	bullet.y = player.y;
-	var dx = target.x - player.x;
-	var dy = target.y - player.y;
+	// Calculate zombie's movement direction
+	var zombieDx = player.x - target.x;
+	var zombieDy = player.y - target.y;
+	var zombieDistance = Math.sqrt(zombieDx * zombieDx + zombieDy * zombieDy);
+	var zombieDirectionX = zombieDistance > 0 ? zombieDx / zombieDistance : 0;
+	var zombieDirectionY = zombieDistance > 0 ? zombieDy / zombieDistance : 0;
+	// Predict where zombie will be
+	var timeToTarget = zombieDistance / bullet.speed;
+	var predictedX = target.x + zombieDirectionX * target.speed * timeToTarget;
+	var predictedY = target.y + zombieDirectionY * target.speed * timeToTarget;
+	// Aim at predicted position
+	var dx = predictedX - player.x;
+	var dy = predictedY - player.y;
 	var distance = Math.sqrt(dx * dx + dy * dy);
 	if (distance > 0) {
 		bullet.directionX = dx / distance;
 		bullet.directionY = dy / distance;