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

/**** 
* Classes
****/ 
var Alien = Container.expand(function () {
	var self = Container.call(this);
	var alienGraphics = self.attachAsset('bomb', {
		// Using bomb asset as alien placeholder
		anchorX: 0.5,
		anchorY: 0.5
	});
	alienGraphics.scaleX = 3;
	alienGraphics.scaleY = 3;
	alienGraphics.tint = 0x00FF00; // Green tint for alien
	self.health = 50;
	self.maxHealth = 50;
	self.shootTimer = 0;
	self.moveTimer = 0;
	self.verticalDirection = 1;
	self.update = function () {
		// Move alien up and down
		self.moveTimer++;
		if (self.moveTimer >= 60) {
			self.verticalDirection *= -1;
			self.moveTimer = 0;
		}
		self.y += self.verticalDirection * 2;
		// Keep alien within bounds
		if (self.y < 400) self.y = 400;
		if (self.y > 1800) self.y = 1800;
		// Shoot at player
		self.shootTimer++;
		if (self.shootTimer >= 90) {
			// Shoot every 1.5 seconds
			shootAtPlayer();
			self.shootTimer = 0;
		}
	};
	return self;
});
var AlienBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('thorn', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.scaleX = 0.5;
	bulletGraphics.scaleY = 0.5;
	bulletGraphics.tint = 0xFF0000; // Red alien bullets
	self.velocityX = 0;
	self.velocityY = 0;
	self.hasHit = false;
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		if (!self.hasHit && self.intersects(mario)) {
			self.hasHit = true;
			takeDamage();
		}
	};
	return self;
});
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hasHit = false;
	self.verticalDirection = 0; // Always fly straight horizontally
	self.update = function () {
		// Move towards character (left) faster than game speed
		self.x -= gameSpeed + 6;
		// Birds fly straight horizontally - no vertical movement
		if (!self.hasHit && self.intersects(mario)) {
			self.hasHit = true;
			takeDamage();
		}
	};
	return self;
});
var Bomb = Container.expand(function () {
	var self = Container.call(this);
	var bombGraphics = self.attachAsset('bomb', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.hasHit = false;
	self.update = function () {
		self.x -= gameSpeed;
		if (!self.hasHit && self.intersects(mario)) {
			self.hasHit = true;
			takeDamage();
		}
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.collected = false;
	self.update = function () {
		self.x -= gameSpeed;
		if (!self.collected && self.intersects(mario)) {
			self.collected = true;
			LK.setScore(LK.getScore() + 10);
			scoreTxt.setText(LK.getScore());
			LK.getSound('coin').play();
			self.alpha = 0;
			// Check if we collected exactly 300 coins to start boss battle
			if (LK.getScore() === 300) {
				startBossBattle();
			} else if (LK.getScore() % 200 === 0 && LK.getScore() > 0 && LK.getScore() !== 300) {
				spawnDoor();
			}
		}
	};
	return self;
});
var Door = Container.expand(function () {
	var self = Container.call(this);
	var doorGraphics = self.attachAsset('door', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.hasEntered = false;
	self.update = function () {
		self.x -= gameSpeed;
		if (!self.hasEntered && self.intersects(mario)) {
			self.hasEntered = true;
			nextLevel();
		}
	};
	return self;
});
var GameOverScreen = Container.expand(function () {
	var self = Container.call(this);
	self.visible = false;
	// Add background image
	var backgroundImg = self.attachAsset('gameOverBackground', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	backgroundImg.x = 1024;
	backgroundImg.y = 800;
	// Game over image
	var gameOverImg = self.attachAsset('gameOverImage', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	gameOverImg.x = 1024;
	gameOverImg.y = 800;
	// Coins collected text
	self.coinsText = new Text2('', {
		size: 80,
		fill: 0xFFD700
	});
	self.coinsText.anchor.set(0.5, 0.5);
	self.coinsText.x = 1024;
	self.coinsText.y = 1500; // Position lower on screen
	self.addChild(self.coinsText);
	// Retry text with bold black styling
	self.retryText = new Text2('TRY AGAIN', {
		size: 80,
		fill: 0x000000,
		fontStyle: 'bold'
	});
	self.retryText.anchor.set(0.5, 0.5);
	self.retryText.x = 1024;
	self.retryText.y = 1700;
	self.addChild(self.retryText);
	self.retryText.down = function (x, y, obj) {
		// Restart game when retry text is clicked
		LK.stopMusic();
		self.hide();
		restartGame();
	};
	self.show = function (coinCount) {
		self.coinsText.setText('TOPLANAN COIN           ' + coinCount);
		self.visible = true;
		LK.playMusic('gameOverMusic');
		// Start upward movement animation for 5 seconds
		var startY = self.coinsText.y;
		var targetY = startY - 100; // Move up 100 pixels
		tween(self.coinsText, {
			y: targetY
		}, {
			duration: 2500,
			easing: tween.easeInOut
		});
		tween(self.coinsText, {
			y: startY
		}, {
			duration: 2500,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				// Animation complete after 5 seconds total
			}
		});
	};
	self.hide = function () {
		self.visible = false;
	};
	self.down = function (x, y, obj) {
		// Restart game when clicked
		LK.stopMusic();
		self.hide();
		restartGame();
	};
	return self;
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0,
		anchorY: 0
	});
	self.update = function () {
		self.x -= gameSpeed;
	};
	return self;
});
var Mario = Container.expand(function () {
	var self = Container.call(this);
	var marioGraphics = self.attachAsset('mario', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityY = 0;
	self.gravity = 0.8;
	self.jumpPower = -30;
	self.isOnGround = false;
	self.isJumping = false;
	self.jump = function () {
		if (self.isOnGround && !self.isJumping) {
			self.velocityY = self.jumpPower;
			self.isOnGround = false;
			self.isJumping = true;
			LK.getSound('jump').play();
		}
	};
	self.update = function () {
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Check platform collisions
		var onPlatform = false;
		for (var i = 0; i < platforms.length; i++) {
			var platform = platforms[i];
			// Better platform collision - check if Mario is above platform and falling down
			var marioBottom = self.y;
			var platformTop = platform.y - 10;
			var platformLeft = platform.x - 300; // Half of platform width (600/2)
			var platformRight = platform.x + 300; // Half of platform width (600/2)
			if (self.velocityY >= 0 && marioBottom >= platformTop - 20 && marioBottom <= platformTop + 20 && self.x >= platformLeft && self.x <= platformRight) {
				self.y = platformTop;
				self.velocityY = 0;
				self.isOnGround = true;
				self.isJumping = false;
				onPlatform = true;
				break;
			}
		}
		// Check ground collision
		if (!onPlatform && self.y >= groundY) {
			self.y = groundY;
			self.velocityY = 0;
			self.isOnGround = true;
			self.isJumping = false;
		}
	};
	return self;
});
var Platform = Container.expand(function () {
	var self = Container.call(this);
	var platformGraphics = self.attachAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= gameSpeed;
	};
	return self;
});
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.scaleX = 0.7;
	bulletGraphics.scaleY = 0.7;
	bulletGraphics.tint = 0x0000FF; // Blue player bullets
	self.velocityX = 15;
	self.velocityY = 0;
	self.hasHit = false;
	self.update = function () {
		self.x += self.velocityX;
		if (!self.hasHit && alien && self.intersects(alien)) {
			self.hasHit = true;
			alien.health--;
			if (alien.health <= 0) {
				defeatedAlien();
			}
			updateAlienHealthBar();
		}
	};
	return self;
});
var Thorn = Container.expand(function () {
	var self = Container.call(this);
	var thornGraphics = self.attachAsset('thorn', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.hasHit = false;
	self.update = function () {
		self.x -= gameSpeed;
		if (!self.hasHit && self.intersects(mario)) {
			self.hasHit = true;
			takeDamage();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb
});

/**** 
* Game Code
****/ 
var mario;
var groundTiles = [];
var coins = [];
var bombs = [];
var thorns = [];
var platforms = [];
var hearts = [];
var doors = [];
var birds = [];
var gameSpeed = 10;
var groundY = 2400;
var maxHealth = 5;
var currentHealth = maxHealth;
var spawnTimer = 0;
var gameStarted = false;
var gameOver = false;
var currentLevel = storage.currentLevel || 1;
var doorSpawned = false;
var gameOverScreen;
var levelTxt = new Text2('Level ' + currentLevel, {
	size: 60,
	fill: 0xFFFFFF
});
levelTxt.anchor.set(0, 0);
LK.gui.topLeft.addChild(levelTxt);
levelTxt.x = 120; // Avoid the platform menu icon
levelTxt.y = 20;
// Boss battle variables
var alien = null;
var alienBullets = [];
var playerBullets = [];
var bossMode = false;
var alienHealthBar = null;
var alienHealthText = null;
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var startButton = new Text2('PLAY', {
	size: 120,
	fill: 0xFFFFFF
});
startButton.anchor.set(0.5, 0.5);
LK.gui.center.addChild(startButton);
var healthInfoText = new Text2('(Oyunda 5 canınız vardır)', {
	size: 100,
	fill: 0xFF0000
});
healthInfoText.anchor.set(0.5, 0.5);
healthInfoText.x = 0;
healthInfoText.y = 100; // Position below the play button
LK.gui.center.addChild(healthInfoText);
var healthInfoEnglishText = new Text2('( You have 5 lives )', {
	size: 100,
	fill: 0xFF0000
});
healthInfoEnglishText.anchor.set(0.5, 0.5);
healthInfoEnglishText.x = 0;
healthInfoEnglishText.y = 200; // Position below the Turkish text
LK.gui.center.addChild(healthInfoEnglishText);
// Add background image to start screen immediately
var background = game.addChild(LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0
}));
background.x = 0;
background.y = 0;
// Play start music on game load
LK.playMusic('startMusic');
// Create alien health display (initially hidden)
alienHealthBar = LK.getAsset('platform', {
	anchorX: 0,
	anchorY: 0.5
});
alienHealthBar.scaleX = 0.5;
alienHealthBar.scaleY = 0.3;
alienHealthBar.tint = 0xFF0000;
alienHealthBar.x = LK.gui.topRight.x - 300;
alienHealthBar.y = 150;
alienHealthBar.visible = false;
LK.gui.topRight.addChild(alienHealthBar);
alienHealthText = new Text2('ALIEN: 50/50', {
	size: 40,
	fill: 0xFFFFFF
});
alienHealthText.anchor.set(1, 0.5);
alienHealthText.x = LK.gui.topRight.x - 20;
alienHealthText.y = 150;
alienHealthText.visible = false;
LK.gui.topRight.addChild(alienHealthText);
function initializeGame() {
	game.setBackgroundColor(0x87ceeb);
	// Destroy existing Mario if it exists
	if (mario) {
		mario.destroy();
	}
	mario = game.addChild(new Mario());
	mario.x = 300;
	mario.y = groundY;
	for (var i = 0; i < 15; i++) {
		var ground = game.addChild(new Ground());
		ground.x = i * 200;
		ground.y = groundY;
		groundTiles.push(ground);
	}
	createHearts();
	if (!gameOverScreen) {
		gameOverScreen = game.addChild(new GameOverScreen());
	}
	gameStarted = true;
	gameOver = false;
	startButton.visible = false;
	healthInfoText.visible = false;
	healthInfoEnglishText.visible = false;
	gameSpeed = 10 + (currentLevel - 1) * 3; // Adjust speed based on level
	levelTxt.setText('Level ' + currentLevel);
	game.setBackgroundColor(0x87ceeb);
	LK.stopMusic();
}
function createHearts() {
	for (var i = 0; i < maxHealth; i++) {
		var heart = LK.getAsset('heart', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		heart.x = LK.gui.topRight.x - 60 - i * 45;
		heart.y = 60;
		hearts.push(heart);
		LK.gui.topRight.addChild(heart);
	}
}
function updateHearts() {
	for (var i = 0; i < hearts.length; i++) {
		hearts[i].alpha = i < currentHealth ? 1.0 : 0.3;
	}
}
function takeDamage() {
	if (currentHealth > 0) {
		currentHealth--;
		updateHearts();
		LK.getSound('hurt').play();
		LK.effects.flashScreen(0xff0000, 300);
		if (currentHealth <= 0) {
			// Show custom game over screen with coin count
			gameOverScreen.show(LK.getScore());
			gameStarted = false; // Stop game updates
			gameOver = true; // Prevent character movement
		}
	}
}
function nextLevel() {
	currentLevel++;
	storage.currentLevel = currentLevel;
	levelTxt.setText('Level ' + currentLevel);
	// Show level announcement
	showLevelAnnouncement();
	// Increase speed each level
	gameSpeed = 10 + (currentLevel - 1) * 3;
	// Clear obstacles but keep coins and score
	for (var i = 0; i < doors.length; i++) {
		doors[i].destroy();
	}
	doors = [];
	doorSpawned = false;
	for (var i = 0; i < bombs.length; i++) {
		bombs[i].destroy();
	}
	bombs = [];
	for (var i = 0; i < thorns.length; i++) {
		thorns[i].destroy();
	}
	thorns = [];
	for (var i = 0; i < platforms.length; i++) {
		platforms[i].destroy();
	}
	platforms = [];
	for (var i = 0; i < birds.length; i++) {
		birds[i].destroy();
	}
	birds = [];
	// Reset Mario position but keep coins
	mario.x = 300;
	mario.y = groundY;
	mario.velocityY = 0;
	mario.isOnGround = true;
	mario.isJumping = false;
}
function restartGame() {
	// Reset all game variables
	currentHealth = maxHealth;
	currentLevel = 1;
	storage.currentLevel = currentLevel;
	doorSpawned = false;
	spawnTimer = 0;
	gameSpeed = 10;
	gameOver = false;
	// Clear all objects
	for (var i = 0; i < coins.length; i++) {
		coins[i].destroy();
	}
	coins = [];
	for (var i = 0; i < bombs.length; i++) {
		bombs[i].destroy();
	}
	bombs = [];
	for (var i = 0; i < thorns.length; i++) {
		thorns[i].destroy();
	}
	thorns = [];
	for (var i = 0; i < platforms.length; i++) {
		platforms[i].destroy();
	}
	platforms = [];
	for (var i = 0; i < doors.length; i++) {
		doors[i].destroy();
	}
	doors = [];
	for (var i = 0; i < birds.length; i++) {
		birds[i].destroy();
	}
	birds = [];
	// Clear boss battle elements
	if (alien) {
		alien.destroy();
		alien = null;
	}
	clearBullets();
	bossMode = false;
	alienHealthBar.visible = false;
	alienHealthText.visible = false;
	// Reset Mario
	mario.x = 300;
	mario.y = groundY;
	mario.velocityY = 0;
	mario.isOnGround = true;
	mario.isJumping = false;
	// Reset score and UI
	LK.setScore(0);
	scoreTxt.setText('0');
	levelTxt.setText('Level ' + currentLevel);
	updateHearts();
	gameStarted = false;
	startButton.visible = true;
	healthInfoText.visible = true;
	healthInfoEnglishText.visible = true;
	LK.playMusic('startMusic');
}
function spawnDoor() {
	if (!doorSpawned) {
		var door = game.addChild(new Door());
		door.x = 2400; // Spawn further away to give player time
		door.y = groundY;
		doors.push(door);
		doorSpawned = true;
	}
}
function startBossBattle() {
	bossMode = true;
	gameSpeed = 0; // Stop scrolling
	// Clear all existing obstacles
	clearAllObstacles();
	// Spawn alien boss
	alien = game.addChild(new Alien());
	alien.x = 1600;
	alien.y = 1000;
	// Show alien health bar
	alienHealthBar.visible = true;
	alienHealthText.visible = true;
	updateAlienHealthBar();
}
function clearAllObstacles() {
	for (var i = 0; i < bombs.length; i++) {
		bombs[i].destroy();
	}
	bombs = [];
	for (var i = 0; i < thorns.length; i++) {
		thorns[i].destroy();
	}
	thorns = [];
	for (var i = 0; i < birds.length; i++) {
		birds[i].destroy();
	}
	birds = [];
	for (var i = 0; i < platforms.length; i++) {
		platforms[i].destroy();
	}
	platforms = [];
}
function shootAtPlayer() {
	if (alien && mario) {
		var bullet = game.addChild(new AlienBullet());
		bullet.x = alien.x;
		bullet.y = alien.y;
		// Calculate direction to player
		var dx = mario.x - alien.x;
		var dy = mario.y - alien.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / distance * 8;
		bullet.velocityY = dy / distance * 8;
		alienBullets.push(bullet);
	}
}
function updateAlienHealthBar() {
	if (alien && alienHealthBar && alienHealthText) {
		var healthPercent = alien.health / alien.maxHealth;
		alienHealthBar.scaleX = 0.5 * healthPercent;
		alienHealthText.setText('ALIEN: ' + alien.health + '/' + alien.maxHealth);
	}
}
function defeatedAlien() {
	bossMode = false;
	gameSpeed = 10 + (currentLevel - 1) * 3; // Resume normal speed
	// Hide alien health bar
	alienHealthBar.visible = false;
	alienHealthText.visible = false;
	// Clear alien and bullets
	if (alien) {
		alien.destroy();
		alien = null;
	}
	clearBullets();
	// Spawn door to next level
	spawnDoor();
}
function clearBullets() {
	for (var i = 0; i < alienBullets.length; i++) {
		alienBullets[i].destroy();
	}
	alienBullets = [];
	for (var i = 0; i < playerBullets.length; i++) {
		playerBullets[i].destroy();
	}
	playerBullets = [];
}
function spawnObstacle() {
	// Don't spawn obstacles if door is active
	if (doorSpawned) {
		return;
	}
	var rand = Math.random();
	var spawnX = 2200;
	if (rand < 0.25) {
		var coin = game.addChild(new Coin());
		coin.x = spawnX;
		coin.y = groundY - 100 - Math.random() * 150;
		coins.push(coin);
	} else if (rand < 0.45) {
		var bomb = game.addChild(new Bomb());
		bomb.x = spawnX + Math.random() * 100 + 50; // Add spacing variation
		bomb.y = groundY;
		bombs.push(bomb);
	} else if (rand < 0.65) {
		var thorn = game.addChild(new Thorn());
		thorn.x = spawnX + Math.random() * 100 + 50; // Add spacing variation
		thorn.y = groundY;
		thorns.push(thorn);
	} else if (rand < 0.85) {
		// Spawn platform with coins on top
		var platform = game.addChild(new Platform());
		platform.x = spawnX + Math.random() * 200 + 100; // Random horizontal position
		platform.y = groundY - 200 - Math.random() * 300; // Random height
		platforms.push(platform);
		// Add 4-6 coins on the platform (spread across the long plank)
		var numCoins = 4 + Math.floor(Math.random() * 3);
		for (var i = 0; i < numCoins; i++) {
			var coin = game.addChild(new Coin());
			coin.x = platform.x - 280 + i * 140; // Spread coins across the 600px wide plank
			coin.y = platform.y - 60;
			coins.push(coin);
		}
	} else {
		// Spawn flying bird
		var bird = game.addChild(new Bird());
		bird.x = spawnX + Math.random() * 100 + 50;
		// Spawn birds either from top or bottom of screen
		if (Math.random() < 0.5) {
			// Spawn from top at platform level
			bird.y = groundY - 200;
			bird.verticalDirection = 0; // Fly straight horizontally
		} else {
			// Spawn from bottom
			bird.y = groundY - 100;
			bird.verticalDirection = 0; // Fly straight horizontally
		}
		birds.push(bird);
	}
}
function cleanupObjects() {
	for (var i = coins.length - 1; i >= 0; i--) {
		if (coins[i].x < -100) {
			coins[i].destroy();
			coins.splice(i, 1);
		}
	}
	for (var i = bombs.length - 1; i >= 0; i--) {
		if (bombs[i].x < -100) {
			bombs[i].destroy();
			bombs.splice(i, 1);
		}
	}
	for (var i = thorns.length - 1; i >= 0; i--) {
		if (thorns[i].x < -100) {
			thorns[i].destroy();
			thorns.splice(i, 1);
		}
	}
	for (var i = platforms.length - 1; i >= 0; i--) {
		if (platforms[i].x < -500) {
			platforms[i].destroy();
			platforms.splice(i, 1);
		}
	}
	for (var i = doors.length - 1; i >= 0; i--) {
		if (doors[i].x < -100) {
			doors[i].destroy();
			doors.splice(i, 1);
		}
	}
	for (var i = birds.length - 1; i >= 0; i--) {
		if (birds[i].x < -100) {
			birds[i].destroy();
			birds.splice(i, 1);
		}
	}
	for (var i = groundTiles.length - 1; i >= 0; i--) {
		if (groundTiles[i].x < -400) {
			var ground = game.addChild(new Ground());
			ground.x = groundTiles[groundTiles.length - 1].x + 200;
			ground.y = groundY;
			groundTiles.push(ground);
			groundTiles[i].destroy();
			groundTiles.splice(i, 1);
		}
	}
}
game.down = function (x, y, obj) {
	if (!gameStarted) {
		initializeGame();
	} else if (!gameOver) {
		if (bossMode) {
			// Shoot bullet during boss battle
			var bullet = game.addChild(new PlayerBullet());
			bullet.x = mario.x;
			bullet.y = mario.y - 50;
			playerBullets.push(bullet);
		} else {
			mario.jump();
		}
	}
};
startButton.down = function (x, y, obj) {
	initializeGame();
};
var levelAnnouncementTxt = null;
var levelAnnouncementTimer = 0;
function showLevelAnnouncement() {
	if (levelAnnouncementTxt) {
		LK.gui.center.removeChild(levelAnnouncementTxt);
	}
	levelAnnouncementTxt = new Text2(currentLevel + '. LEVEL', {
		size: 120,
		fill: 0xFFD700
	});
	levelAnnouncementTxt.anchor.set(0.5, 0.5);
	LK.gui.center.addChild(levelAnnouncementTxt);
	levelAnnouncementTimer = 120; // Show for 2 seconds at 60fps
}
game.update = function () {
	if (!gameStarted) {
		return;
	}
	// Handle level announcement display
	if (levelAnnouncementTimer > 0) {
		levelAnnouncementTimer--;
		if (levelAnnouncementTimer <= 0 && levelAnnouncementTxt) {
			LK.gui.center.removeChild(levelAnnouncementTxt);
			levelAnnouncementTxt = null;
		}
		return; // Don't spawn obstacles while showing level announcement
	}
	spawnTimer++;
	if (spawnTimer >= 60) {
		// Reduced from 90 to 60 for faster spawning
		spawnObstacle();
		spawnTimer = 0;
	}
	if (!bossMode) {
		cleanupObjects();
		gameSpeed += 0.005;
	} else {
		// Boss battle bullet cleanup
		for (var i = alienBullets.length - 1; i >= 0; i--) {
			if (alienBullets[i].x < -100 || alienBullets[i].x > 2200 || alienBullets[i].y < -100 || alienBullets[i].y > 2800) {
				alienBullets[i].destroy();
				alienBullets.splice(i, 1);
			}
		}
		for (var i = playerBullets.length - 1; i >= 0; i--) {
			if (playerBullets[i].x > 2200 || playerBullets[i].x < -100) {
				playerBullets[i].destroy();
				playerBullets.splice(i, 1);
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -6,8 +6,66 @@
 
 /**** 
 * Classes
 ****/ 
+var Alien = Container.expand(function () {
+	var self = Container.call(this);
+	var alienGraphics = self.attachAsset('bomb', {
+		// Using bomb asset as alien placeholder
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	alienGraphics.scaleX = 3;
+	alienGraphics.scaleY = 3;
+	alienGraphics.tint = 0x00FF00; // Green tint for alien
+	self.health = 50;
+	self.maxHealth = 50;
+	self.shootTimer = 0;
+	self.moveTimer = 0;
+	self.verticalDirection = 1;
+	self.update = function () {
+		// Move alien up and down
+		self.moveTimer++;
+		if (self.moveTimer >= 60) {
+			self.verticalDirection *= -1;
+			self.moveTimer = 0;
+		}
+		self.y += self.verticalDirection * 2;
+		// Keep alien within bounds
+		if (self.y < 400) self.y = 400;
+		if (self.y > 1800) self.y = 1800;
+		// Shoot at player
+		self.shootTimer++;
+		if (self.shootTimer >= 90) {
+			// Shoot every 1.5 seconds
+			shootAtPlayer();
+			self.shootTimer = 0;
+		}
+	};
+	return self;
+});
+var AlienBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('thorn', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	bulletGraphics.scaleX = 0.5;
+	bulletGraphics.scaleY = 0.5;
+	bulletGraphics.tint = 0xFF0000; // Red alien bullets
+	self.velocityX = 0;
+	self.velocityY = 0;
+	self.hasHit = false;
+	self.update = function () {
+		self.x += self.velocityX;
+		self.y += self.velocityY;
+		if (!self.hasHit && self.intersects(mario)) {
+			self.hasHit = true;
+			takeDamage();
+		}
+	};
+	return self;
+});
 var Bird = Container.expand(function () {
 	var self = Container.call(this);
 	var birdGraphics = self.attachAsset('bird', {
 		anchorX: 0.5,
@@ -56,10 +114,12 @@
 			LK.setScore(LK.getScore() + 10);
 			scoreTxt.setText(LK.getScore());
 			LK.getSound('coin').play();
 			self.alpha = 0;
-			// Check if we collected exactly 200 coins (or multiples of 200)
-			if (LK.getScore() % 200 === 0 && LK.getScore() > 0) {
+			// Check if we collected exactly 300 coins to start boss battle
+			if (LK.getScore() === 300) {
+				startBossBattle();
+			} else if (LK.getScore() % 200 === 0 && LK.getScore() > 0 && LK.getScore() !== 300) {
 				spawnDoor();
 			}
 		}
 	};
@@ -228,8 +288,33 @@
 		self.x -= gameSpeed;
 	};
 	return self;
 });
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('coin', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	bulletGraphics.scaleX = 0.7;
+	bulletGraphics.scaleY = 0.7;
+	bulletGraphics.tint = 0x0000FF; // Blue player bullets
+	self.velocityX = 15;
+	self.velocityY = 0;
+	self.hasHit = false;
+	self.update = function () {
+		self.x += self.velocityX;
+		if (!self.hasHit && alien && self.intersects(alien)) {
+			self.hasHit = true;
+			alien.health--;
+			if (alien.health <= 0) {
+				defeatedAlien();
+			}
+			updateAlienHealthBar();
+		}
+	};
+	return self;
+});
 var Thorn = Container.expand(function () {
 	var self = Container.call(this);
 	var thornGraphics = self.attachAsset('thorn', {
 		anchorX: 0.5,
@@ -282,8 +367,15 @@
 levelTxt.anchor.set(0, 0);
 LK.gui.topLeft.addChild(levelTxt);
 levelTxt.x = 120; // Avoid the platform menu icon
 levelTxt.y = 20;
+// Boss battle variables
+var alien = null;
+var alienBullets = [];
+var playerBullets = [];
+var bossMode = false;
+var alienHealthBar = null;
+var alienHealthText = null;
 var scoreTxt = new Text2('0', {
 	size: 80,
 	fill: 0xFFFFFF
 });
@@ -319,8 +411,29 @@
 background.x = 0;
 background.y = 0;
 // Play start music on game load
 LK.playMusic('startMusic');
+// Create alien health display (initially hidden)
+alienHealthBar = LK.getAsset('platform', {
+	anchorX: 0,
+	anchorY: 0.5
+});
+alienHealthBar.scaleX = 0.5;
+alienHealthBar.scaleY = 0.3;
+alienHealthBar.tint = 0xFF0000;
+alienHealthBar.x = LK.gui.topRight.x - 300;
+alienHealthBar.y = 150;
+alienHealthBar.visible = false;
+LK.gui.topRight.addChild(alienHealthBar);
+alienHealthText = new Text2('ALIEN: 50/50', {
+	size: 40,
+	fill: 0xFFFFFF
+});
+alienHealthText.anchor.set(1, 0.5);
+alienHealthText.x = LK.gui.topRight.x - 20;
+alienHealthText.y = 150;
+alienHealthText.visible = false;
+LK.gui.topRight.addChild(alienHealthText);
 function initializeGame() {
 	game.setBackgroundColor(0x87ceeb);
 	// Destroy existing Mario if it exists
 	if (mario) {
@@ -450,8 +563,17 @@
 	for (var i = 0; i < birds.length; i++) {
 		birds[i].destroy();
 	}
 	birds = [];
+	// Clear boss battle elements
+	if (alien) {
+		alien.destroy();
+		alien = null;
+	}
+	clearBullets();
+	bossMode = false;
+	alienHealthBar.visible = false;
+	alienHealthText.visible = false;
 	// Reset Mario
 	mario.x = 300;
 	mario.y = groundY;
 	mario.velocityY = 0;
@@ -476,8 +598,86 @@
 		doors.push(door);
 		doorSpawned = true;
 	}
 }
+function startBossBattle() {
+	bossMode = true;
+	gameSpeed = 0; // Stop scrolling
+	// Clear all existing obstacles
+	clearAllObstacles();
+	// Spawn alien boss
+	alien = game.addChild(new Alien());
+	alien.x = 1600;
+	alien.y = 1000;
+	// Show alien health bar
+	alienHealthBar.visible = true;
+	alienHealthText.visible = true;
+	updateAlienHealthBar();
+}
+function clearAllObstacles() {
+	for (var i = 0; i < bombs.length; i++) {
+		bombs[i].destroy();
+	}
+	bombs = [];
+	for (var i = 0; i < thorns.length; i++) {
+		thorns[i].destroy();
+	}
+	thorns = [];
+	for (var i = 0; i < birds.length; i++) {
+		birds[i].destroy();
+	}
+	birds = [];
+	for (var i = 0; i < platforms.length; i++) {
+		platforms[i].destroy();
+	}
+	platforms = [];
+}
+function shootAtPlayer() {
+	if (alien && mario) {
+		var bullet = game.addChild(new AlienBullet());
+		bullet.x = alien.x;
+		bullet.y = alien.y;
+		// Calculate direction to player
+		var dx = mario.x - alien.x;
+		var dy = mario.y - alien.y;
+		var distance = Math.sqrt(dx * dx + dy * dy);
+		bullet.velocityX = dx / distance * 8;
+		bullet.velocityY = dy / distance * 8;
+		alienBullets.push(bullet);
+	}
+}
+function updateAlienHealthBar() {
+	if (alien && alienHealthBar && alienHealthText) {
+		var healthPercent = alien.health / alien.maxHealth;
+		alienHealthBar.scaleX = 0.5 * healthPercent;
+		alienHealthText.setText('ALIEN: ' + alien.health + '/' + alien.maxHealth);
+	}
+}
+function defeatedAlien() {
+	bossMode = false;
+	gameSpeed = 10 + (currentLevel - 1) * 3; // Resume normal speed
+	// Hide alien health bar
+	alienHealthBar.visible = false;
+	alienHealthText.visible = false;
+	// Clear alien and bullets
+	if (alien) {
+		alien.destroy();
+		alien = null;
+	}
+	clearBullets();
+	// Spawn door to next level
+	spawnDoor();
+}
+function clearBullets() {
+	for (var i = 0; i < alienBullets.length; i++) {
+		alienBullets[i].destroy();
+	}
+	alienBullets = [];
+	for (var i = 0; i < playerBullets.length; i++) {
+		playerBullets[i].destroy();
+	}
+	playerBullets = [];
+}
 function spawnObstacle() {
 	// Don't spawn obstacles if door is active
 	if (doorSpawned) {
 		return;
@@ -581,9 +781,17 @@
 game.down = function (x, y, obj) {
 	if (!gameStarted) {
 		initializeGame();
 	} else if (!gameOver) {
-		mario.jump();
+		if (bossMode) {
+			// Shoot bullet during boss battle
+			var bullet = game.addChild(new PlayerBullet());
+			bullet.x = mario.x;
+			bullet.y = mario.y - 50;
+			playerBullets.push(bullet);
+		} else {
+			mario.jump();
+		}
 	}
 };
 startButton.down = function (x, y, obj) {
 	initializeGame();
@@ -620,7 +828,23 @@
 		// Reduced from 90 to 60 for faster spawning
 		spawnObstacle();
 		spawnTimer = 0;
 	}
-	cleanupObjects();
-	gameSpeed += 0.005;
+	if (!bossMode) {
+		cleanupObjects();
+		gameSpeed += 0.005;
+	} else {
+		// Boss battle bullet cleanup
+		for (var i = alienBullets.length - 1; i >= 0; i--) {
+			if (alienBullets[i].x < -100 || alienBullets[i].x > 2200 || alienBullets[i].y < -100 || alienBullets[i].y > 2800) {
+				alienBullets[i].destroy();
+				alienBullets.splice(i, 1);
+			}
+		}
+		for (var i = playerBullets.length - 1; i >= 0; i--) {
+			if (playerBullets[i].x > 2200 || playerBullets[i].x < -100) {
+				playerBullets[i].destroy();
+				playerBullets.splice(i, 1);
+			}
+		}
+	}
 };
\ No newline at end of file