===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,239 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// PipePair class
+var PipePair = Container.expand(function () {
+	var self = Container.call(this);
+	// Top pipe
+	var topPipe = self.attachAsset('pipe', {
+		anchorX: 0,
+		anchorY: 1
+	});
+	// Bottom pipe
+	var bottomPipe = self.attachAsset('pipe', {
+		anchorX: 0,
+		anchorY: 0
+	});
+	self.topPipe = topPipe;
+	self.bottomPipe = bottomPipe;
+	// Set pipes' positions based on gapY
+	self.setGap = function (gapY) {
+		// gapY is the vertical center of the gap
+		var gapTop = gapY - gapHeight / 2;
+		var gapBottom = gapY + gapHeight / 2;
+		topPipe.x = 0;
+		topPipe.y = gapTop;
+		topPipe.height = gapTop;
+		bottomPipe.x = 0;
+		bottomPipe.y = gapBottom;
+		bottomPipe.height = 2732 - gapBottom - groundHeight;
+	};
+	// For collision detection
+	self.getTopBounds = function () {
+		return {
+			x: self.x,
+			y: 0,
+			width: topPipe.width,
+			height: topPipe.y
+		};
+	};
+	self.getBottomBounds = function () {
+		return {
+			x: self.x,
+			y: bottomPipe.y,
+			width: bottomPipe.width,
+			height: bottomPipe.height
+		};
+	};
+	// Used to check if player has passed this pipe
+	self.passed = false;
+	return self;
+});
+// Player class
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var playerSprite = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = playerSprite.width / 2;
+	self.vy = 0; // vertical velocity
+	// For collision detection
+	self.getBounds = function () {
+		return {
+			x: self.x - self.radius,
+			y: self.y - self.radius,
+			width: self.radius * 2,
+			height: self.radius * 2
+		};
+	};
+	// Update position and apply gravity
+	self.update = function () {
+		self.vy += gravity;
+		self.y += self.vy;
+		// Clamp to top of screen
+		if (self.y - self.radius < 0) {
+			self.y = self.radius;
+			self.vy = 0;
+		}
+	};
+	// Jump
+	self.flap = function () {
+		self.vy = jumpVelocity;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87ceeb // Sky blue
+});
+
+/**** 
+* Game Code
+****/ 
+// Ground
+// Pipe (green)
+// Character (bird/ball)
+// Constants
+var gravity = 2.2;
+var jumpVelocity = -38;
+var pipeSpeed = 16;
+var pipeInterval = 90; // frames between pipes
+var gapHeight = 520;
+var groundHeight = 120;
+var pipeWidth = 220;
+// Game state
+var player;
+var pipes = [];
+var ground;
+var score = 0;
+var scoreTxt;
+var lastPipeTick = 0;
+var gameStarted = false;
+var gameOver = false;
+// Create ground
+ground = LK.getAsset('ground', {
+	anchorX: 0,
+	anchorY: 0,
+	x: 0,
+	y: 2732 - groundHeight
+});
+game.addChild(ground);
+// Create player
+player = new Player();
+player.x = 420;
+player.y = 2732 / 2;
+game.addChild(player);
+// Score text
+scoreTxt = new Text2('0', {
+	size: 180,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Reset function
+function resetGame() {
+	// Remove pipes
+	for (var i = pipes.length - 1; i >= 0; i--) {
+		pipes[i].destroy();
+		pipes.splice(i, 1);
+	}
+	// Reset player
+	player.x = 420;
+	player.y = 2732 / 2;
+	player.vy = 0;
+	// Reset score
+	score = 0;
+	scoreTxt.setText(score);
+	lastPipeTick = LK.ticks;
+	gameStarted = false;
+	gameOver = false;
+}
+// Start game on first tap
+game.down = function (x, y, obj) {
+	if (gameOver) return;
+	if (!gameStarted) {
+		gameStarted = true;
+		player.flap();
+	} else {
+		player.flap();
+	}
+};
+// Main update loop
+game.update = function () {
+	if (gameOver) return;
+	if (gameStarted) {
+		player.update();
+		// Move pipes and check for collisions
+		for (var i = pipes.length - 1; i >= 0; i--) {
+			var pipePair = pipes[i];
+			pipePair.x -= pipeSpeed;
+			// Remove pipes that have gone off screen
+			if (pipePair.x + pipeWidth < 0) {
+				pipePair.destroy();
+				pipes.splice(i, 1);
+				continue;
+			}
+			// Check for collision with player
+			var pBounds = player.getBounds();
+			var tBounds = pipePair.getTopBounds();
+			var bBounds = pipePair.getBottomBounds();
+			if (rectsIntersect(pBounds, tBounds) || rectsIntersect(pBounds, bBounds)) {
+				endGame();
+				return;
+			}
+			// Check if player passed the pipe for scoring
+			if (!pipePair.passed && pipePair.x + pipeWidth < player.x - player.radius) {
+				pipePair.passed = true;
+				score += 1;
+				scoreTxt.setText(score);
+			}
+		}
+		// Add new pipes
+		if (LK.ticks - lastPipeTick >= pipeInterval) {
+			var gapY = getRandomGapY();
+			var pipePair = new PipePair();
+			pipePair.x = 2048;
+			pipePair.setGap(gapY);
+			pipes.push(pipePair);
+			game.addChild(pipePair);
+			lastPipeTick = LK.ticks;
+		}
+		// Check collision with ground
+		if (player.y + player.radius >= 2732 - groundHeight) {
+			player.y = 2732 - groundHeight - player.radius;
+			endGame();
+			return;
+		}
+	}
+};
+// End game
+function endGame() {
+	gameOver = true;
+	LK.effects.flashScreen(0xff0000, 600);
+	LK.showGameOver();
+}
+// Utility: Rectangle intersection
+function rectsIntersect(a, b) {
+	return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
+}
+// Utility: Random gap Y position (avoid too close to top/bottom)
+function getRandomGapY() {
+	var minY = gapHeight / 2 + 120;
+	var maxY = 2732 - groundHeight - gapHeight / 2 - 120;
+	return minY + Math.floor(Math.random() * (maxY - minY));
+}
+// Reset game on game over
+LK.on('gameover', function () {
+	resetGame();
+});
+// Initial reset
+resetGame();
\ No newline at end of file