/**** 
* 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 () {
		// Store previous position for trail effect
		if (self.lastX === undefined) {
			self.lastX = self.x;
			self.lastY = self.y;
		}
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
		// Create trail particle
		if (Math.random() < 0.7) {
			var trailParticle = LK.getAsset('bullet', {
				anchorX: 0.5,
				anchorY: 0.5,
				scaleX: 0.3,
				scaleY: 0.3,
				tint: 0xFFFF88,
				alpha: 0.6
			});
			trailParticle.x = self.lastX;
			trailParticle.y = self.lastY;
			game.addChild(trailParticle);
			// Fade out trail particle
			tween(trailParticle, {
				alpha: 0,
				scaleX: 0.1,
				scaleY: 0.1
			}, {
				duration: 200,
				onFinish: function onFinish() {
					trailParticle.destroy();
				}
			});
		}
		self.lastX = self.x;
		self.lastY = self.y;
	};
	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.maxHealth = 1;
	// Create health bar background
	var healthBarBg = LK.getAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		scaleY: 0.5,
		tint: 0x333333
	});
	healthBarBg.y = -140;
	self.addChild(healthBarBg);
	// Create health bar fill
	var healthBarFill = LK.getAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		scaleY: 0.5,
		tint: 0xFF0000
	});
	healthBarFill.y = -140;
	self.addChild(healthBarFill);
	self.healthBarFill = healthBarFill;
	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;
			}
			// Add pulsing effect based on distance to player
			var pulseIntensity = Math.max(0.1, 1 - distance / 500);
			var pulseSpeed = self.speed * 0.1;
			self.scaleX = 1 + Math.sin(gameTime * pulseSpeed) * pulseIntensity * 0.2;
			self.scaleY = 1 + Math.sin(gameTime * pulseSpeed) * pulseIntensity * 0.2;
			// Add red tint when close to player
			if (distance < 200) {
				self.tint = 0xFF6666;
			} else {
				self.tint = 0xFFFFFF;
			}
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game state management
var gameState = 'menu'; // 'menu', 'playing', 'gameOver'
var menuContainer;
var playButton;
// 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;
var comboCount = 0;
var comboTimer = 0;
var comboDecayTime = 180; // 3 seconds at 60fps
var scoreMultiplier = 1;
// Create main menu
menuContainer = new Container();
game.addChild(menuContainer);
// Menu title
var titleTxt = new Text2('ZOMBIE SHOOTER', {
	size: 120,
	fill: 0xFF4444
});
titleTxt.anchor.set(0.5, 0.5);
titleTxt.x = 2048 / 2;
titleTxt.y = 2732 / 2 - 200;
menuContainer.addChild(titleTxt);
// Play button background
var playButtonBg = LK.getAsset('zombie', {
	anchorX: 0.5,
	anchorY: 0.5,
	scaleX: 1.5,
	scaleY: 0.8,
	tint: 0x44AA44
});
playButtonBg.x = 2048 / 2;
playButtonBg.y = 2732 / 2 + 50;
menuContainer.addChild(playButtonBg);
// Play button text
var playButtonTxt = new Text2('PLAY', {
	size: 80,
	fill: 0xFFFFFF
});
playButtonTxt.anchor.set(0.5, 0.5);
playButtonTxt.x = 2048 / 2;
playButtonTxt.y = 2732 / 2 + 50;
menuContainer.addChild(playButtonTxt);
// Store reference to play button for event handling
playButton = playButtonBg;
// Game UI Elements (initially hidden)
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.visible = false;
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;
waveTxt.visible = false;
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;
timeTxt.visible = false;
LK.gui.topRight.addChild(timeTxt);
var comboTxt = new Text2('', {
	size: 80,
	fill: 0xFFAA00
});
comboTxt.anchor.set(0.5, 0.5);
comboTxt.visible = false;
LK.gui.center.addChild(comboTxt);
// Game initialization function
function initializeGame() {
	// Reset game variables
	gameTime = 0;
	zombiesKilled = 0;
	waveNumber = 1;
	comboCount = 0;
	comboTimer = 0;
	scoreMultiplier = 1;
	zombieSpawnRate = 50;
	zombieSpeed = 4;
	// Clear existing game objects
	if (player) {
		player.destroy();
	}
	for (var i = 0; i < zombies.length; i++) {
		zombies[i].destroy();
	}
	for (var j = 0; j < bullets.length; j++) {
		bullets[j].destroy();
	}
	zombies = [];
	bullets = [];
	// Initialize player
	player = game.addChild(new Player());
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	// Reset score
	LK.setScore(0);
	scoreTxt.setText('Score: 0');
	// Show game UI
	scoreTxt.visible = true;
	waveTxt.visible = true;
	timeTxt.visible = true;
	comboTxt.visible = true;
	// Hide menu
	menuContainer.visible = false;
	// Set game state
	gameState = 'playing';
}
// Don't initialize player immediately - wait for menu interaction
// 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;
	// Add spawn effect - start small and grow
	zombie.scaleX = 0.1;
	zombie.scaleY = 0.1;
	zombie.alpha = 0.3;
	// Create spawn particles
	for (var sp = 0; sp < 6; sp++) {
		var spawnParticle = LK.getAsset('zombie', {
			anchorX: 0.5,
			anchorY: 0.5,
			scaleX: 0.2,
			scaleY: 0.2,
			tint: 0x00FF00,
			alpha: 0.8
		});
		spawnParticle.x = zombie.x;
		spawnParticle.y = zombie.y;
		var angle = sp / 6 * Math.PI * 2;
		spawnParticle.velocityX = Math.cos(angle) * 3;
		spawnParticle.velocityY = Math.sin(angle) * 3;
		game.addChild(spawnParticle);
		// Animate spawn particles
		tween(spawnParticle, {
			alpha: 0,
			scaleX: 0.05,
			scaleY: 0.05,
			x: spawnParticle.x + spawnParticle.velocityX * 20,
			y: spawnParticle.y + spawnParticle.velocityY * 20
		}, {
			duration: 400,
			onFinish: function onFinish() {
				spawnParticle.destroy();
			}
		});
	}
	// Animate zombie growth
	tween(zombie, {
		scaleX: 1,
		scaleY: 1,
		alpha: 1
	}, {
		duration: 500
	});
	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;
	}
	// Create muzzle flash effect
	var muzzleFlash = LK.getAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		scaleY: 3,
		tint: 0xFFFF00,
		alpha: 0.8
	});
	muzzleFlash.x = player.x + 25; // Position at weapon location
	muzzleFlash.y = player.y;
	game.addChild(muzzleFlash);
	// Animate muzzle flash fade out
	tween(muzzleFlash, {
		alpha: 0,
		scaleX: 0.5,
		scaleY: 0.5
	}, {
		duration: 100,
		onFinish: function onFinish() {
			muzzleFlash.destroy();
		}
	});
	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) {
	if (gameState === 'menu') {
		// Check if play button was clicked
		var localPos = menuContainer.toLocal({
			x: x,
			y: y
		});
		if (playButton.getBounds().contains(localPos.x, localPos.y)) {
			initializeGame();
		}
	} else if (gameState === 'playing') {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game loop
game.update = function () {
	// Only update game logic when playing
	if (gameState !== 'playing') {
		return;
	}
	gameTime++;
	// Update UI
	timeTxt.setText('Time: ' + Math.floor(gameTime / 60) + 's');
	// Update combo system
	if (comboTimer > 0) {
		comboTimer--;
		if (comboTimer <= 0) {
			comboCount = 0;
			scoreMultiplier = 1;
			comboTxt.setText('');
		}
	}
	// 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();
				// Update combo system
				comboCount++;
				comboTimer = comboDecayTime;
				scoreMultiplier = Math.min(5, 1 + Math.floor(comboCount / 3));
				// Show combo text
				if (comboCount > 2) {
					comboTxt.setText('COMBO x' + scoreMultiplier);
					comboTxt.alpha = 1;
					comboTxt.scaleX = 1.5;
					comboTxt.scaleY = 1.5;
					// Animate combo text
					tween(comboTxt, {
						scaleX: 1,
						scaleY: 1,
						alpha: 0.7
					}, {
						duration: 300
					});
				}
				// Create explosion effect at zombie position
				var explosionParticles = [];
				for (var p = 0; p < 8; p++) {
					var particle = LK.getAsset('bullet', {
						anchorX: 0.5,
						anchorY: 0.5,
						scaleX: 0.5,
						scaleY: 0.5,
						tint: 0xFF4444
					});
					particle.x = zombie.x;
					particle.y = zombie.y;
					var angle = p / 8 * Math.PI * 2;
					particle.velocityX = Math.cos(angle) * 8;
					particle.velocityY = Math.sin(angle) * 8;
					particle.life = 30;
					explosionParticles.push(particle);
					game.addChild(particle);
				}
				// Animate explosion particles
				var _animateExplosion = function animateExplosion() {
					for (var ep = explosionParticles.length - 1; ep >= 0; ep--) {
						var particle = explosionParticles[ep];
						particle.x += particle.velocityX;
						particle.y += particle.velocityY;
						particle.velocityX *= 0.9;
						particle.velocityY *= 0.9;
						particle.alpha = particle.life / 30;
						particle.life--;
						if (particle.life <= 0) {
							particle.destroy();
							explosionParticles.splice(ep, 1);
						}
					}
					if (explosionParticles.length > 0) {
						LK.setTimeout(_animateExplosion, 16);
					}
				};
				_animateExplosion();
				zombie.destroy();
				zombies.splice(j, 1);
				bullet.destroy();
				bullets.splice(i, 1);
				zombiesKilled++;
				LK.setScore(LK.getScore() + 10 * scoreMultiplier + 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
			// Add screen shake effect
			var shakeIntensity = 20;
			var shakeDuration = 60;
			var shakeFrames = 0;
			var originalX = game.x;
			var originalY = game.y;
			var _shakeEffect = function shakeEffect() {
				if (shakeFrames < shakeDuration) {
					game.x = originalX + (Math.random() - 0.5) * shakeIntensity;
					game.y = originalY + (Math.random() - 0.5) * shakeIntensity;
					shakeFrames++;
					LK.setTimeout(_shakeEffect, 16);
				} else {
					game.x = originalX;
					game.y = originalY;
				}
			};
			_shakeEffect();
			LK.effects.flashScreen(0xFF0000, 1000);
			// Reset to menu state
			gameState = 'menu';
			menuContainer.visible = true;
			scoreTxt.visible = false;
			waveTxt.visible = false;
			timeTxt.visible = false;
			comboTxt.visible = false;
			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
@@ -138,8 +138,12 @@
 
 /**** 
 * Game Code
 ****/ 
+// Game state management
+var gameState = 'menu'; // 'menu', 'playing', 'gameOver'
+var menuContainer;
+var playButton;
 // Game variables
 var player;
 var zombies = [];
 var bullets = [];
@@ -152,41 +156,116 @@
 var comboCount = 0;
 var comboTimer = 0;
 var comboDecayTime = 180; // 3 seconds at 60fps
 var scoreMultiplier = 1;
-// UI Elements
+// Create main menu
+menuContainer = new Container();
+game.addChild(menuContainer);
+// Menu title
+var titleTxt = new Text2('ZOMBIE SHOOTER', {
+	size: 120,
+	fill: 0xFF4444
+});
+titleTxt.anchor.set(0.5, 0.5);
+titleTxt.x = 2048 / 2;
+titleTxt.y = 2732 / 2 - 200;
+menuContainer.addChild(titleTxt);
+// Play button background
+var playButtonBg = LK.getAsset('zombie', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	scaleX: 1.5,
+	scaleY: 0.8,
+	tint: 0x44AA44
+});
+playButtonBg.x = 2048 / 2;
+playButtonBg.y = 2732 / 2 + 50;
+menuContainer.addChild(playButtonBg);
+// Play button text
+var playButtonTxt = new Text2('PLAY', {
+	size: 80,
+	fill: 0xFFFFFF
+});
+playButtonTxt.anchor.set(0.5, 0.5);
+playButtonTxt.x = 2048 / 2;
+playButtonTxt.y = 2732 / 2 + 50;
+menuContainer.addChild(playButtonTxt);
+// Store reference to play button for event handling
+playButton = playButtonBg;
+// Game UI Elements (initially hidden)
 var scoreTxt = new Text2('Score: 0', {
 	size: 60,
 	fill: 0xFFFFFF
 });
 scoreTxt.anchor.set(0.5, 0);
+scoreTxt.visible = false;
 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;
+waveTxt.visible = false;
 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;
+timeTxt.visible = false;
 LK.gui.topRight.addChild(timeTxt);
 var comboTxt = new Text2('', {
 	size: 80,
 	fill: 0xFFAA00
 });
 comboTxt.anchor.set(0.5, 0.5);
+comboTxt.visible = false;
 LK.gui.center.addChild(comboTxt);
-// Initialize player
-player = game.addChild(new Player());
-player.x = 2048 / 2;
-player.y = 2732 / 2;
+// Game initialization function
+function initializeGame() {
+	// Reset game variables
+	gameTime = 0;
+	zombiesKilled = 0;
+	waveNumber = 1;
+	comboCount = 0;
+	comboTimer = 0;
+	scoreMultiplier = 1;
+	zombieSpawnRate = 50;
+	zombieSpeed = 4;
+	// Clear existing game objects
+	if (player) {
+		player.destroy();
+	}
+	for (var i = 0; i < zombies.length; i++) {
+		zombies[i].destroy();
+	}
+	for (var j = 0; j < bullets.length; j++) {
+		bullets[j].destroy();
+	}
+	zombies = [];
+	bullets = [];
+	// Initialize player
+	player = game.addChild(new Player());
+	player.x = 2048 / 2;
+	player.y = 2732 / 2;
+	// Reset score
+	LK.setScore(0);
+	scoreTxt.setText('Score: 0');
+	// Show game UI
+	scoreTxt.visible = true;
+	waveTxt.visible = true;
+	timeTxt.visible = true;
+	comboTxt.visible = true;
+	// Hide menu
+	menuContainer.visible = false;
+	// Set game state
+	gameState = 'playing';
+}
+// Don't initialize player immediately - wait for menu interaction
 // Helper functions
 function spawnZombie() {
 	var zombie = new Zombie();
 	var side = Math.floor(Math.random() * 4);
@@ -339,16 +418,31 @@
 	}
 }
 game.move = handleMove;
 game.down = function (x, y, obj) {
-	dragNode = player;
-	handleMove(x, y, obj);
+	if (gameState === 'menu') {
+		// Check if play button was clicked
+		var localPos = menuContainer.toLocal({
+			x: x,
+			y: y
+		});
+		if (playButton.getBounds().contains(localPos.x, localPos.y)) {
+			initializeGame();
+		}
+	} else if (gameState === 'playing') {
+		dragNode = player;
+		handleMove(x, y, obj);
+	}
 };
 game.up = function (x, y, obj) {
 	dragNode = null;
 };
 // Main game loop
 game.update = function () {
+	// Only update game logic when playing
+	if (gameState !== 'playing') {
+		return;
+	}
 	gameTime++;
 	// Update UI
 	timeTxt.setText('Time: ' + Math.floor(gameTime / 60) + 's');
 	// Update combo system
@@ -490,8 +584,15 @@
 				}
 			};
 			_shakeEffect();
 			LK.effects.flashScreen(0xFF0000, 1000);
+			// Reset to menu state
+			gameState = 'menu';
+			menuContainer.visible = true;
+			scoreTxt.visible = false;
+			waveTxt.visible = false;
+			timeTxt.visible = false;
+			comboTxt.visible = false;
 			LK.showGameOver();
 			return;
 		}
 	}