/**** 
* Classes
****/ 
// Define a Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.update = function () {
		self.y += self.speed;
	};
});
// Define an Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyBody = self.attachAsset('enemyBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyArms = self.attachAsset('enemyArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyLegs = self.attachAsset('enemyLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyHead = self.attachAsset('enemyHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyArms.y = -enemyBody.height / 4;
	enemyLegs.y = enemyBody.height / 2;
	enemyHead.y = -enemyBody.height / 2;
	self.speed = 6;
	self.update = function () {
		// Calculate the direction vector between enemy and NPCs
		var dxNpc = 0;
		var dyNpc = 0;
		var closestNpc = null;
		var closestDistance = Infinity;
		for (var i = 0; i < npcs.length; i++) {
			var dx = npcs[i].x - self.x;
			var dy = npcs[i].y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < closestDistance) {
				closestNpc = npcs[i];
				closestDistance = distance;
			}
		}
		if (closestNpc) {
			dxNpc = closestNpc.x - self.x;
			dyNpc = closestNpc.y - self.y;
			var magnitudeNpc = Math.sqrt(dxNpc * dxNpc + dyNpc * dyNpc);
			// Normalize the direction vector
			dxNpc /= magnitudeNpc;
			dyNpc /= magnitudeNpc;
			// Move the enemy towards the closest NPC
			self.x += dxNpc * self.speed;
			self.y += dyNpc * self.speed;
		} else {
			// Calculate the direction vector between enemy and player
			var dxPlayer = player.x - self.x;
			var dyPlayer = player.y - self.y;
			var magnitudePlayer = Math.sqrt(dxPlayer * dxPlayer + dyPlayer * dyPlayer);
			// Normalize the direction vector
			dxPlayer /= magnitudePlayer;
			dyPlayer /= magnitudePlayer;
			// Move the enemy towards the player
			self.x += dxPlayer * self.speed;
			self.y += dyPlayer * self.speed;
		}
	};
});
// Define a MenuScreen class
var MenuScreen = Container.expand(function () {
	var self = Container.call(this);
	// Create a title text
	var titleText = new Text2('Night of the Massacre', {
		size: 200,
		fill: "#ffffff"
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 2048 / 2;
	titleText.y = 2732 / 4;
	self.addChild(titleText);
	// Create a start button
	var startButton = new Text2('Start Game', {
		size: 150,
		fill: "#00ff00"
	});
	startButton.anchor.set(0.5, 0.5);
	startButton.x = 2048 / 2;
	startButton.y = 2732 / 2;
	self.addChild(startButton);
	// Add event listener to start button
	startButton.down = function () {
		self.destroy(); // Remove menu screen
		initializeGame(); // Start the game
	};
});
// Define a NPC class
var NPC = Container.expand(function () {
	var self = Container.call(this);
	var npcHead = self.attachAsset('playerHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcHead.y = -80;
	var npcBody = self.attachAsset('playerBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var npcArms = self.attachAsset('playerArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcArms.y = -30;
	var npcLegs = self.attachAsset('playerLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcLegs.y = 40;
	self.speed = 4;
	self.update = function () {
		// Randomly change direction every 60 frames
		if (LK.ticks % 60 == 0) {
			self.direction = Math.random() * Math.PI * 2;
		}
		// Calculate dx and dy based on the current direction
		var dx = Math.cos(self.direction);
		var dy = Math.sin(self.direction);
		// Move the NPC
		self.x += dx * self.speed;
		self.y += dy * self.speed;
		// Ensure NPC stays within game boundaries
		if (self.x < 0) {
			self.x = 0;
			self.direction = Math.PI - self.direction;
		}
		if (self.x > 2048) {
			self.x = 2048;
			self.direction = Math.PI - self.direction;
		}
		if (self.y < 0) {
			self.y = 0;
			self.direction = -self.direction;
		}
		if (self.y > 2732) {
			self.y = 2732;
			self.direction = -self.direction;
		}
	};
});
//<Assets used in the game will automatically appear here>
// Define a Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerHead = self.attachAsset('playerHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerHead.y = -80;
	var playerBody = self.attachAsset('playerBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var playerArms = self.attachAsset('playerArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerArms.y = -30;
	var playerLegs = self.attachAsset('playerLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerLegs.y = 40;
	self.speed = 5;
	self.update = function () {
		// Player update logic
	};
});
// Define a Tree class
var Tree = Container.expand(function () {
	var self = Container.call(this);
	var treeTrunk = self.attachAsset('treeTrunk', {
		anchorX: 0.5,
		anchorY: 1
	});
	var treeLeaves = self.attachAsset('treeLeaves', {
		anchorX: 0.5,
		anchorY: 1
	});
	treeLeaves.y = -treeTrunk.height;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0000FF //Init game with blue background
});

/**** 
* Game Code
****/ 
// Add the menu screen to the game
var menuScreen = game.addChild(new MenuScreen());
function initializeGame() {
	// Initialize player
	var player = game.addChild(new Player());
	player.x = 2048 / 2;
	player.y = 2732 - 150;
	// Initialize enemies
	var enemies = [];
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = Math.random() * 1000;
	enemies.push(enemy);
	game.addChild(enemy);
	// Initialize 30 trees and spread them across the game
	var trees = [];
	for (var i = 0; i < 30; i++) {
		var tree = game.addChild(new Tree());
		tree.x = Math.random() * 2048;
		tree.y = Math.random() * 2732;
		trees.push(tree);
	}
	// Initialize NPCs
	var npcs = [];
	for (var i = 0; i < 20; i++) {
		var npc = game.addChild(new NPC());
		npc.x = Math.random() * 2048;
		npc.y = Math.random() * 2732;
		npcs.push(npc);
	}
	// Initialize bullets
	var bullets = [];
}
// Handle player movement
game.move = function (x, y, obj) {
	player.x = x;
	player.y = y;
};
// Handle shooting
game.down = function (x, y, obj) {
	var bullet = new Bullet();
	bullet.x = player.x;
	bullet.y = player.y;
	bullets.push(bullet);
	game.addChild(bullet);
};
// Game update loop
game.update = function () {
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
		if (player.intersects(enemies[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		// Check if any NPC intersects with enemy
		for (var j = npcs.length - 1; j >= 0; j--) {
			if (npcs[j] && npcs[j].intersects(enemies[i])) {
				npcs[j].destroy(); // Destroy NPC
				npcs.splice(j, 1); // Remove NPC from array
			}
		}
	}
	// Update bullets
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (bullets[j] && bullets[j].intersects(enemies[k])) {
				bullets[j].destroy();
				bullets.splice(j, 1);
				enemies[k].destroy();
				enemies.splice(k, 1);
				break;
			}
		}
		if (bullets[j] && bullets[j].y < -50) {
			bullets[j].destroy();
			bullets.splice(j, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,19 @@
 /**** 
 * Classes
 ****/ 
+// Define a Bullet class
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -10;
+	self.update = function () {
+		self.y += self.speed;
+	};
+});
 // Define an Enemy class
 var Enemy = Container.expand(function () {
 	var self = Container.call(this);
 	var enemyBody = self.attachAsset('enemyBody', {
@@ -62,8 +74,35 @@
 			self.y += dyPlayer * self.speed;
 		}
 	};
 });
+// Define a MenuScreen class
+var MenuScreen = Container.expand(function () {
+	var self = Container.call(this);
+	// Create a title text
+	var titleText = new Text2('Night of the Massacre', {
+		size: 200,
+		fill: "#ffffff"
+	});
+	titleText.anchor.set(0.5, 0.5);
+	titleText.x = 2048 / 2;
+	titleText.y = 2732 / 4;
+	self.addChild(titleText);
+	// Create a start button
+	var startButton = new Text2('Start Game', {
+		size: 150,
+		fill: "#00ff00"
+	});
+	startButton.anchor.set(0.5, 0.5);
+	startButton.x = 2048 / 2;
+	startButton.y = 2732 / 2;
+	self.addChild(startButton);
+	// Add event listener to start button
+	startButton.down = function () {
+		self.destroy(); // Remove menu screen
+		initializeGame(); // Start the game
+	};
+});
 // Define a NPC class
 var NPC = Container.expand(function () {
 	var self = Container.call(this);
 	var npcHead = self.attachAsset('playerHead', {
@@ -161,80 +200,17 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x0000FF,
-	//Init game with blue background
-	menu: {
-		title: 'Night of the Massacre 2',
-		buttons: [{
-			text: 'Start Game',
-			action: function action() {
-				game.start();
-			}
-		}, {
-			text: 'Instructions',
-			action: function action() {
-				game.showInstructions();
-			}
-		}]
-	}
+	backgroundColor: 0x0000FF //Init game with blue background
 });
 
 /**** 
 * Game Code
 ****/ 
-// Initialize player
-var player = game.addChild(new Player());
-player.x = 2048 / 2;
-player.y = 2732 - 150;
-// Initialize enemies
-var enemies = [];
-var enemy = new Enemy();
-enemy.x = Math.random() * 2048;
-enemy.y = Math.random() * 1000;
-enemies.push(enemy);
-game.addChild(enemy);
-// Initialize 30 trees and spread them across the game
-var trees = [];
-for (var i = 0; i < 30; i++) {
-	var tree = game.addChild(new Tree());
-	tree.x = Math.random() * 2048;
-	tree.y = Math.random() * 2732;
-	trees.push(tree);
-}
-// Initialize NPCs
-var npcs = [];
-for (var i = 0; i < 20; i++) {
-	var npc = game.addChild(new NPC());
-	npc.x = Math.random() * 2048;
-	npc.y = Math.random() * 2732;
-	npcs.push(npc);
-}
-game.move = function (x, y, obj) {
-	player.x = x;
-	player.y = y;
-};
-// Handle shooting
-game.update = function () {
-	// Update enemies
-	for (var i = 0; i < enemies.length; i++) {
-		enemies[i].update();
-		if (player.intersects(enemies[i])) {
-			LK.effects.flashScreen(0xff0000, 1000);
-			LK.showGameOver();
-		}
-		// Check if any NPC intersects with enemy
-		for (var j = npcs.length - 1; j >= 0; j--) {
-			if (npcs[j] && npcs[j].intersects(enemies[i])) {
-				npcs[j].destroy(); // Destroy NPC
-				npcs.splice(j, 1); // Remove NPC from array
-			}
-		}
-	}
-	// Update bullets
-};
-game.start = function () {
+// Add the menu screen to the game
+var menuScreen = game.addChild(new MenuScreen());
+function initializeGame() {
 	// Initialize player
 	var player = game.addChild(new Player());
 	player.x = 2048 / 2;
 	player.y = 2732 - 150;
@@ -260,32 +236,55 @@
 		npc.x = Math.random() * 2048;
 		npc.y = Math.random() * 2732;
 		npcs.push(npc);
 	}
-	game.move = function (x, y, obj) {
-		player.x = x;
-		player.y = y;
-	};
-	// Handle shooting
-	game.update = function () {
-		// Update enemies
-		for (var i = 0; i < enemies.length; i++) {
-			enemies[i].update();
-			if (player.intersects(enemies[i])) {
-				LK.effects.flashScreen(0xff0000, 1000);
-				LK.showGameOver();
+	// Initialize bullets
+	var bullets = [];
+}
+// Handle player movement
+game.move = function (x, y, obj) {
+	player.x = x;
+	player.y = y;
+};
+// Handle shooting
+game.down = function (x, y, obj) {
+	var bullet = new Bullet();
+	bullet.x = player.x;
+	bullet.y = player.y;
+	bullets.push(bullet);
+	game.addChild(bullet);
+};
+// Game update loop
+game.update = function () {
+	// Update enemies
+	for (var i = 0; i < enemies.length; i++) {
+		enemies[i].update();
+		if (player.intersects(enemies[i])) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+		}
+		// Check if any NPC intersects with enemy
+		for (var j = npcs.length - 1; j >= 0; j--) {
+			if (npcs[j] && npcs[j].intersects(enemies[i])) {
+				npcs[j].destroy(); // Destroy NPC
+				npcs.splice(j, 1); // Remove NPC from array
 			}
-			// Check if any NPC intersects with enemy
-			for (var j = npcs.length - 1; j >= 0; j--) {
-				if (npcs[j] && npcs[j].intersects(enemies[i])) {
-					npcs[j].destroy(); // Destroy NPC
-					npcs.splice(j, 1); // Remove NPC from array
-				}
+		}
+	}
+	// Update bullets
+	for (var j = bullets.length - 1; j >= 0; j--) {
+		bullets[j].update();
+		for (var k = enemies.length - 1; k >= 0; k--) {
+			if (bullets[j] && bullets[j].intersects(enemies[k])) {
+				bullets[j].destroy();
+				bullets.splice(j, 1);
+				enemies[k].destroy();
+				enemies.splice(k, 1);
+				break;
 			}
 		}
-		// Update bullets
-	};
-};
-game.showInstructions = function () {
-	var instructions = "Welcome to Night of the Massacre 2! \n\n" + "You are the yellow player. Use your mouse or touch to move around. \n\n" + "Click or tap to shoot bullets. \n\n" + "Your goal is to protect the NPCs (non-player characters) from the red enemies. \n\n" + "If an enemy touches you, it's game over! \n\n" + "Good luck!";
-	alert(instructions);
+		if (bullets[j] && bullets[j].y < -50) {
+			bullets[j].destroy();
+			bullets.splice(j, 1);
+		}
+	}
 };
\ No newline at end of file