/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	highScore: 0
});

/**** 
* Classes
****/ 
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	var cloudGraphics = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.7 + Math.random() * 0.3 // Varied transparency
	});
	self.speed = 0.5 + Math.random() * 1.5; // Varied speed
	self.update = function () {
		self.x -= self.speed;
		// Reset cloud position when it goes off screen
		if (self.x < -cloudGraphics.width) {
			self.x = 2048 + cloudGraphics.width;
			self.y = 200 + Math.random() * 300;
		}
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 0;
	self.type = 'coin';
	// Bobbing animation
	tween(coinGraphics, {
		y: 10
	}, {
		duration: 800,
		easing: tween.easeInOut,
		onFinish: function onFinish() {
			tween(coinGraphics, {
				y: -10
			}, {
				duration: 800,
				easing: tween.easeInOut,
				onFinish: function onFinish() {
					// Reset position and restart animation
					coinGraphics.y = 0;
					self.update();
				}
			});
		}
	});
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 0;
	self.type = 'obstacle';
	self.update = function () {
		self.x -= 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
	});
	self.velocity = 0;
	self.gravity = 0.8;
	self.jumpForce = -18;
	self.isJumping = false;
	self.isInvincible = false;
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		self.y += self.velocity;
		// Ground collision
		if (self.y > GROUND_LEVEL - playerGraphics.height / 2) {
			self.y = GROUND_LEVEL - playerGraphics.height / 2;
			self.velocity = 0;
			self.isJumping = false;
		}
	};
	self.jump = function () {
		if (!self.isJumping) {
			self.velocity = self.jumpForce;
			self.isJumping = true;
			LK.getSound('jump').play();
		}
	};
	self.makeInvincible = function (duration) {
		if (self.invincibleTimeout) {
			LK.clearTimeout(self.invincibleTimeout);
		}
		self.isInvincible = true;
		// Flash effect
		var flashInterval = LK.setInterval(function () {
			playerGraphics.alpha = playerGraphics.alpha === 1 ? 0.4 : 1;
		}, 150);
		self.invincibleTimeout = LK.setTimeout(function () {
			self.isInvincible = false;
			playerGraphics.alpha = 1;
			LK.clearInterval(flashInterval);
		}, duration);
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 0;
	self.type = 'powerup';
	// Rotate animation
	self.rotationSpeed = 0.02;
	self.update = function () {
		self.x -= self.speed;
		powerupGraphics.rotation += self.rotationSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Constants
var GROUND_LEVEL = 2500;
var BASE_SPEED = 8;
var SCORE_MULTIPLIER = 0.1;
var DIFFICULTY_INCREASE_RATE = 0.0001;
// Game variables
var player;
var ground;
var obstacles = [];
var coins = [];
var powerups = [];
var clouds = [];
var gameSpeed = BASE_SPEED;
var distanceCounter = 0;
var lastObstacleSpawn = 0;
var lastCoinSpawn = 0;
var lastPowerupSpawn = 0;
var obstacleSpawnDistance = 300;
var isGameActive = true;
var highScore = storage.highScore || 0;
// Setup UI
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var highScoreTxt = new Text2('HIGH: 0', {
	size: 60,
	fill: 0xFFFFFF
});
highScoreTxt.anchor.set(0.5, 0);
highScoreTxt.y = 110;
LK.gui.top.addChild(highScoreTxt);
highScoreTxt.setText('HIGH: ' + highScore);
// Initialize ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: GROUND_LEVEL
});
game.addChild(ground);
// Initialize player
player = new Player();
player.x = 300;
player.y = GROUND_LEVEL - 100;
game.addChild(player);
// Initialize clouds
function createInitialClouds() {
	for (var i = 0; i < 5; i++) {
		var cloud = new Cloud();
		cloud.x = Math.random() * 2048;
		cloud.y = 200 + Math.random() * 300;
		clouds.push(cloud);
		game.addChild(cloud);
	}
}
createInitialClouds();
// Game mechanics functions
function spawnObstacle() {
	var obstacle = new Obstacle();
	obstacle.x = 2100;
	obstacle.y = GROUND_LEVEL - obstacle.height / 2;
	obstacle.speed = gameSpeed;
	obstacles.push(obstacle);
	game.addChild(obstacle);
}
function spawnCoin() {
	var coin = new Coin();
	coin.x = 2100;
	coin.y = GROUND_LEVEL - 150 - Math.random() * 200; // Random height
	coin.speed = gameSpeed;
	coins.push(coin);
	game.addChild(coin);
}
function spawnPowerUp() {
	var powerup = new PowerUp();
	powerup.x = 2100;
	powerup.y = GROUND_LEVEL - 150 - Math.random() * 100;
	powerup.speed = gameSpeed;
	powerups.push(powerup);
	game.addChild(powerup);
}
function checkCollisions() {
	// Check obstacle collisions
	for (var i = obstacles.length - 1; i >= 0; i--) {
		if (player.intersects(obstacles[i]) && !player.isInvincible) {
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 500);
			// Game over handling
			if (LK.getScore() > highScore) {
				highScore = LK.getScore();
				storage.highScore = highScore;
				highScoreTxt.setText('HIGH: ' + Math.floor(highScore));
			}
			LK.showGameOver();
			isGameActive = false;
			return;
		}
	}
	// Check coin collisions
	for (var j = coins.length - 1; j >= 0; j--) {
		if (player.intersects(coins[j])) {
			LK.getSound('collect').play();
			LK.setScore(LK.getScore() + 10);
			scoreTxt.setText(Math.floor(LK.getScore()));
			// Remove coin
			coins[j].destroy();
			coins.splice(j, 1);
		}
	}
	// Check powerup collisions
	for (var k = powerups.length - 1; k >= 0; k--) {
		if (player.intersects(powerups[k])) {
			LK.getSound('powerup').play();
			// Apply powerup effect (invincibility)
			player.makeInvincible(5000);
			// Remove powerup
			powerups[k].destroy();
			powerups.splice(k, 1);
		}
	}
}
function updateObjects() {
	// Update game elements
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].speed = gameSpeed;
		if (obstacles[i].x < -obstacles[i].width) {
			obstacles[i].destroy();
			obstacles.splice(i, 1);
		}
	}
	for (var j = coins.length - 1; j >= 0; j--) {
		coins[j].speed = gameSpeed;
		if (coins[j].x < -coins[j].width) {
			coins[j].destroy();
			coins.splice(j, 1);
		}
	}
	for (var k = powerups.length - 1; k >= 0; k--) {
		powerups[k].speed = gameSpeed;
		if (powerups[k].x < -powerups[k].width) {
			powerups[k].destroy();
			powerups.splice(k, 1);
		}
	}
}
// Input handlers
game.down = function (x, y, obj) {
	player.jump();
};
// Main game loop
game.update = function () {
	if (!isGameActive) return;
	// Update distance and score
	distanceCounter += gameSpeed;
	LK.setScore(LK.getScore() + SCORE_MULTIPLIER);
	if (LK.ticks % 10 === 0) {
		scoreTxt.setText(Math.floor(LK.getScore()));
	}
	// Increase difficulty
	gameSpeed = BASE_SPEED + distanceCounter * DIFFICULTY_INCREASE_RATE;
	// Spawn obstacles
	if (distanceCounter - lastObstacleSpawn > obstacleSpawnDistance) {
		spawnObstacle();
		lastObstacleSpawn = distanceCounter;
		// Make obstacles appear more frequently as game progresses
		obstacleSpawnDistance = 300 - Math.min(150, Math.floor(distanceCounter / 500));
	}
	// Spawn coins
	if (distanceCounter - lastCoinSpawn > 500) {
		spawnCoin();
		lastCoinSpawn = distanceCounter;
	}
	// Spawn powerups (less frequently)
	if (distanceCounter - lastPowerupSpawn > 2000) {
		spawnPowerUp();
		lastPowerupSpawn = distanceCounter;
	}
	// Update all game objects
	updateObjects();
	// Check for collisions
	checkCollisions();
};
// Start background music
LK.playMusic('bgmusic', {
	fade: {
		start: 0,
		end: 0.4,
		duration: 1000
	}
});

===================================================================
--- original.js
+++ change.js
@@ -139,9 +139,9 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x87CEEB
+	backgroundColor: 0x000000
 });
 
 /**** 
 * Game Code