===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,283 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Dog = Container.expand(function () {
+	var self = Container.call(this);
+	var dogGraphics = self.attachAsset('dog', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
+	return self;
+});
+var Obstacle = Container.expand(function (type) {
+	var self = Container.call(this);
+	self.obstacleType = type || 'car';
+	var obstacleGraphics;
+	if (self.obstacleType === 'car') {
+		obstacleGraphics = self.attachAsset('car', {
+			anchorX: 0.5,
+			anchorY: 1.0
+		});
+	} else if (self.obstacleType === 'tallCar') {
+		obstacleGraphics = self.attachAsset('tallCar', {
+			anchorX: 0.5,
+			anchorY: 1.0
+		});
+	} else if (self.obstacleType === 'gnome') {
+		obstacleGraphics = self.attachAsset('gnome', {
+			anchorX: 0.5,
+			anchorY: 1.0
+		});
+	} else if (self.obstacleType === 'fence') {
+		obstacleGraphics = self.attachAsset('fence', {
+			anchorX: 0.5,
+			anchorY: 1.0
+		});
+	}
+	self.speed = -8;
+	self.update = function () {
+		self.x += self.speed;
+	};
+	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 = -8;
+	self.collected = false;
+	self.update = function () {
+		self.x += self.speed;
+		self.rotation += 0.1;
+	};
+	return self;
+});
+var Walter = Container.expand(function () {
+	var self = Container.call(this);
+	var walterGraphics = self.attachAsset('walter', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
+	self.velocityY = 0;
+	self.groundY = 0;
+	self.isJumping = false;
+	self.jumpPower = -25;
+	self.gravity = 1.2;
+	self.invulnerable = false;
+	self.invulnerabilityTime = 0;
+	self.jump = function () {
+		if (!self.isJumping) {
+			self.velocityY = self.jumpPower;
+			self.isJumping = true;
+			LK.getSound('jump').play();
+		}
+	};
+	self.update = function () {
+		if (self.isJumping) {
+			self.velocityY += self.gravity;
+			self.y += self.velocityY;
+			if (self.y >= self.groundY) {
+				self.y = self.groundY;
+				self.velocityY = 0;
+				self.isJumping = false;
+			}
+		}
+		if (self.invulnerable && self.invulnerabilityTime > 0) {
+			self.invulnerabilityTime--;
+			walterGraphics.alpha = self.invulnerabilityTime % 10 < 5 ? 0.5 : 1.0;
+			if (self.invulnerabilityTime <= 0) {
+				self.invulnerable = false;
+				walterGraphics.alpha = 1.0;
+			}
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87CEEB
+});
+
+/**** 
+* Game Code
+****/ 
+var gameSpeed = 8;
+var distance = 0;
+var obstacles = [];
+var powerups = [];
+var lives = 3;
+var speedBoostTime = 0;
+var lastObstacleX = 2048;
+var lastPowerupX = 2048;
+// Create ground
+var ground = game.addChild(LK.getAsset('ground', {
+	anchorX: 0,
+	anchorY: 1.0,
+	x: 0,
+	y: 2732 - 100
+}));
+var groundY = ground.y - ground.height;
+// Create Walter
+var walter = game.addChild(new Walter());
+walter.x = 300;
+walter.y = groundY;
+walter.groundY = groundY;
+// Create Dog
+var dog = game.addChild(new Dog());
+dog.x = -200;
+dog.y = groundY;
+// Create UI
+var scoreText = new Text2('Distance: 0m', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+scoreText.anchor.set(0, 0);
+LK.gui.topRight.addChild(scoreText);
+var livesText = new Text2('Lives: 3', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+livesText.anchor.set(0, 0);
+livesText.x = -400;
+LK.gui.topRight.addChild(livesText);
+var instructionText = new Text2('TAP TO JUMP!', {
+	size: 80,
+	fill: 0xFFFF00
+});
+instructionText.anchor.set(0.5, 0.5);
+LK.gui.center.addChild(instructionText);
+// Hide instruction after 3 seconds
+LK.setTimeout(function () {
+	if (instructionText.parent) {
+		instructionText.parent.removeChild(instructionText);
+	}
+}, 3000);
+function spawnObstacle() {
+	if (lastObstacleX <= 1500) {
+		var obstacleTypes = ['car', 'tallCar', 'gnome', 'fence'];
+		var randomType = obstacleTypes[Math.floor(Math.random() * obstacleTypes.length)];
+		var obstacle = new Obstacle(randomType);
+		obstacle.x = 2048 + 100;
+		obstacle.y = groundY;
+		obstacle.speed = -gameSpeed;
+		obstacles.push(obstacle);
+		game.addChild(obstacle);
+		lastObstacleX = obstacle.x;
+	}
+}
+function spawnPowerup() {
+	if (Math.random() < 0.3 && lastPowerupX <= 1000) {
+		var powerup = new PowerUp();
+		powerup.x = 2048 + 50;
+		powerup.y = groundY - 50;
+		powerup.speed = -gameSpeed;
+		powerups.push(powerup);
+		game.addChild(powerup);
+		lastPowerupX = powerup.x;
+	}
+}
+function checkCollisions() {
+	// Check obstacle collisions
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		var obstacle = obstacles[i];
+		if (walter.intersects(obstacle) && !walter.invulnerable) {
+			LK.getSound('crash').play();
+			lives--;
+			livesText.setText('Lives: ' + lives);
+			if (lives <= 0) {
+				LK.showGameOver();
+				return;
+			}
+			walter.invulnerable = true;
+			walter.invulnerabilityTime = 120; // 2 seconds at 60fps
+			LK.effects.flashScreen(0xFF0000, 500);
+		}
+		if (obstacle.x < -200) {
+			obstacle.destroy();
+			obstacles.splice(i, 1);
+		}
+	}
+	// Check powerup collisions
+	for (var j = powerups.length - 1; j >= 0; j--) {
+		var powerup = powerups[j];
+		if (walter.intersects(powerup) && !powerup.collected) {
+			LK.getSound('collect').play();
+			powerup.collected = true;
+			speedBoostTime = 300; // 5 seconds boost
+			LK.effects.flashObject(walter, 0xFFD700, 500);
+			powerup.destroy();
+			powerups.splice(j, 1);
+			continue;
+		}
+		if (powerup.x < -100) {
+			powerup.destroy();
+			powerups.splice(j, 1);
+		}
+	}
+}
+function updateDog() {
+	var targetX = walter.x - 400;
+	if (dog.x < targetX) {
+		dog.x += 3;
+	}
+	// Check if dog catches Walter
+	if (dog.intersects(walter) && !walter.invulnerable) {
+		LK.effects.flashScreen(0xFF0000, 1000);
+		LK.showGameOver();
+	}
+}
+game.down = function (x, y, obj) {
+	walter.jump();
+};
+game.update = function () {
+	// Update distance and speed
+	distance += gameSpeed * 0.1;
+	gameSpeed += 0.002; // Gradually increase speed
+	// Update speed boost
+	if (speedBoostTime > 0) {
+		speedBoostTime--;
+		gameSpeed *= 1.5;
+	}
+	// Update obstacle speeds
+	for (var i = 0; i < obstacles.length; i++) {
+		obstacles[i].speed = -gameSpeed;
+	}
+	for (var j = 0; j < powerups.length; j++) {
+		powerups[j].speed = -gameSpeed;
+	}
+	// Update last obstacle position
+	if (obstacles.length > 0) {
+		lastObstacleX = obstacles[obstacles.length - 1].x;
+	} else {
+		lastObstacleX = 0;
+	}
+	// Update last powerup position
+	if (powerups.length > 0) {
+		lastPowerupX = powerups[powerups.length - 1].x;
+	} else {
+		lastPowerupX = 0;
+	}
+	// Spawn obstacles and powerups
+	if (LK.ticks % 60 === 0) {
+		// Every second
+		spawnObstacle();
+		spawnPowerup();
+	}
+	// Update game objects
+	updateDog();
+	checkCollisions();
+	// Update UI
+	scoreText.setText('Distance: ' + Math.floor(distance) + 'm');
+	// Update score for leaderboard
+	LK.setScore(Math.floor(distance));
+};
\ No newline at end of file