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

/**** 
* Classes
****/ 
var Lane = Container.expand(function () {
	var self = Container.call(this);
	var laneGraphics = self.attachAsset('lane', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.y += scrollSpeed;
	};
	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 = 3;
	self.update = function () {
		self.y += self.speed + scrollSpeed;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 0;
	self.maxSpeed = 8;
	self.acceleration = 0.3;
	self.deceleration = 0.5;
	self.isAccelerating = false;
	self.invulnerable = false;
	self.invulnerableTime = 0;
	self.startAcceleration = function () {
		self.isAccelerating = true;
		LK.getSound('engine').play();
	};
	self.stopAcceleration = function () {
		self.isAccelerating = false;
		LK.getSound('brake').play();
	};
	self.update = function () {
		if (self.isAccelerating) {
			self.speed = Math.min(self.speed + self.acceleration, self.maxSpeed);
		} else {
			self.speed = Math.max(self.speed - self.deceleration, 0);
		}
		// Handle invulnerability
		if (self.invulnerable) {
			self.invulnerableTime--;
			playerGraphics.alpha = self.invulnerableTime % 10 < 5 ? 0.5 : 1.0;
			if (self.invulnerableTime <= 0) {
				self.invulnerable = false;
				playerGraphics.alpha = 1.0;
			}
		}
	};
	self.makeInvulnerable = function (duration) {
		self.invulnerable = true;
		self.invulnerableTime = 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 = 3;
	self.rotationSpeed = 0.1;
	self.update = function () {
		self.y += self.speed + scrollSpeed;
		powerupGraphics.rotation += self.rotationSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2c5f2d
});

/**** 
* Game Code
****/ 
// Game variables
var player;
var obstacles = [];
var powerups = [];
var lanes = [];
var scrollSpeed = 4;
var gameSpeed = 1;
var spawnTimer = 0;
var powerupTimer = 0;
var distance = 0;
var lanePositions = [512, 768, 1024, 1280, 1536]; // 5 lanes
var nextLevelDistance = 1000;
// Background setup
var backgroundImage = game.addChild(LK.getAsset('Background', {
	anchorX: 0,
	anchorY: 0,
	scaleX: 20.48,
	scaleY: 27.32
}));
backgroundImage.x = 0;
backgroundImage.y = 0;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
scoreTxt.x = 120;
scoreTxt.y = 50;
LK.gui.topLeft.addChild(scoreTxt);
var speedTxt = new Text2('Speed: 0', {
	size: 50,
	fill: 0xFFFFFF
});
speedTxt.anchor.set(1, 0);
speedTxt.x = -50;
speedTxt.y = 50;
LK.gui.topRight.addChild(speedTxt);
var distanceTxt = new Text2('Distance: 0m', {
	size: 50,
	fill: 0xFFFFFF
});
distanceTxt.anchor.set(0.5, 0);
distanceTxt.x = 0;
distanceTxt.y = 50;
LK.gui.top.addChild(distanceTxt);
// Initialize player
player = game.addChild(new Player());
player.x = 1024; // Center lane
player.y = 2200;
// Initialize lane markers
function createLaneMarkers() {
	for (var i = 0; i < 8; i++) {
		var lane = game.addChild(new Lane());
		lane.x = 1024;
		lane.y = i * 400 - 200;
		lanes.push(lane);
	}
}
createLaneMarkers();
// Spawn obstacle
function spawnObstacle() {
	var obstacle = game.addChild(new Obstacle());
	obstacle.x = lanePositions[Math.floor(Math.random() * lanePositions.length)];
	obstacle.y = -100;
	obstacles.push(obstacle);
}
// Spawn powerup
function spawnPowerUp() {
	var powerup = game.addChild(new PowerUp());
	powerup.x = lanePositions[Math.floor(Math.random() * lanePositions.length)];
	powerup.y = -100;
	powerups.push(powerup);
}
// Handle player movement
function handlePlayerMovement(x, y, obj) {
	// Calculate which lane the touch is in
	var targetLane = 2; // Default to center
	if (x < 640) targetLane = 0;else if (x < 896) targetLane = 1;else if (x < 1152) targetLane = 2;else if (x < 1408) targetLane = 3;else targetLane = 4;
	// Move player to target lane
	tween(player, {
		x: lanePositions[targetLane]
	}, {
		duration: 200,
		easing: tween.easeOut
	});
}
// Game controls
game.down = function (x, y, obj) {
	player.startAcceleration();
	handlePlayerMovement(x, y, obj);
};
game.up = function (x, y, obj) {
	player.stopAcceleration();
};
game.move = function (x, y, obj) {
	if (player.isAccelerating) {
		handlePlayerMovement(x, y, obj);
	}
};
// Main game loop
game.update = function () {
	// Update distance and score
	distance += scrollSpeed;
	LK.setScore(Math.floor(distance / 10));
	// Update UI
	scoreTxt.setText('Score: ' + LK.getScore());
	speedTxt.setText('Speed: ' + Math.floor(player.speed));
	distanceTxt.setText('Distance: ' + Math.floor(distance / 10) + 'm');
	// Increase difficulty over time
	if (distance > nextLevelDistance) {
		gameSpeed += 0.1;
		scrollSpeed = Math.min(scrollSpeed + 0.5, 10);
		nextLevelDistance += 1000;
	}
	// Spawn obstacles
	spawnTimer++;
	if (spawnTimer > Math.max(60 - gameSpeed * 5, 20)) {
		spawnObstacle();
		spawnTimer = 0;
	}
	// Spawn powerups
	powerupTimer++;
	if (powerupTimer > 300) {
		spawnPowerUp();
		powerupTimer = 0;
	}
	// Update and check obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		// Track last position for off-screen detection
		if (obstacle.lastY === undefined) obstacle.lastY = obstacle.y;
		// Remove off-screen obstacles
		if (obstacle.lastY < 2800 && obstacle.y >= 2800) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (!player.invulnerable && obstacle.intersects(player)) {
			LK.getSound('crash').play();
			LK.effects.flashScreen(0xff0000, 500);
			LK.showGameOver();
			return;
		}
		obstacle.lastY = obstacle.y;
	}
	// Update and check powerups
	for (var j = powerups.length - 1; j >= 0; j--) {
		var powerup = powerups[j];
		// Track last position for off-screen detection
		if (powerup.lastY === undefined) powerup.lastY = powerup.y;
		// Remove off-screen powerups
		if (powerup.lastY < 2800 && powerup.y >= 2800) {
			powerup.destroy();
			powerups.splice(j, 1);
			continue;
		}
		// Check collection
		if (powerup.intersects(player)) {
			LK.getSound('powerup').play();
			LK.setScore(LK.getScore() + 50);
			player.makeInvulnerable(180); // 3 seconds of invulnerability
			powerup.destroy();
			powerups.splice(j, 1);
			continue;
		}
		powerup.lastY = powerup.y;
	}
	// Update and recycle lane markers
	for (var k = lanes.length - 1; k >= 0; k--) {
		var lane = lanes[k];
		// Track last position for recycling
		if (lane.lastY === undefined) lane.lastY = lane.y;
		// Recycle lane markers that go off screen
		if (lane.lastY < 2800 && lane.y >= 2800) {
			lane.y = -200;
		}
		lane.lastY = lane.y;
	}
	// Win condition - reach 5000m
	if (distance >= 50000) {
		LK.showYouWin();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -108,8 +108,17 @@
 var powerupTimer = 0;
 var distance = 0;
 var lanePositions = [512, 768, 1024, 1280, 1536]; // 5 lanes
 var nextLevelDistance = 1000;
+// Background setup
+var backgroundImage = game.addChild(LK.getAsset('Background', {
+	anchorX: 0,
+	anchorY: 0,
+	scaleX: 20.48,
+	scaleY: 27.32
+}));
+backgroundImage.x = 0;
+backgroundImage.y = 0;
 // UI Elements
 var scoreTxt = new Text2('Score: 0', {
 	size: 60,
 	fill: 0xFFFFFF