===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,256 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Bird class
+var Bird = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach a yellow ellipse as the bird
+	var birdAsset = self.attachAsset('bird', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Bird physics
+	self.velocityY = 0;
+	self.gravity = 1.2; // Gravity per frame
+	self.flapStrength = -28; // Negative for upward movement
+	// Bird size for collision
+	self.radius = birdAsset.width * 0.45;
+	// Flap method
+	self.flap = function () {
+		self.velocityY = self.flapStrength;
+		// Animate a quick upward tilt
+		tween(self, {
+			rotation: -0.3
+		}, {
+			duration: 80,
+			easing: tween.cubicOut,
+			onFinish: function onFinish() {
+				// Return to downward tilt
+				tween(self, {
+					rotation: 0.4
+				}, {
+					duration: 300,
+					easing: tween.cubicIn
+				});
+			}
+		});
+	};
+	// Update method
+	self.update = function () {
+		self.velocityY += self.gravity;
+		self.y += self.velocityY;
+		// Clamp rotation based on velocity
+		if (self.velocityY > 0) {
+			self.rotation = 0.4;
+		} else if (self.velocityY < 0) {
+			self.rotation = -0.3;
+		}
+	};
+	return self;
+});
+// PipePair class (top and bottom pipes)
+var PipePair = Container.expand(function () {
+	var self = Container.call(this);
+	// Pipe config
+	self.pipeWidth = 220;
+	self.gapHeight = 520;
+	self.speed = 12;
+	// Randomize gap position
+	var minGapY = 400;
+	var maxGapY = 2732 - 400 - self.gapHeight;
+	self.gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY));
+	// Top pipe
+	var topPipe = self.attachAsset('pipe', {
+		anchorX: 0,
+		anchorY: 1,
+		width: self.pipeWidth,
+		height: self.gapY,
+		color: 0x3bb54a,
+		shape: 'box',
+		x: 0,
+		y: self.gapY
+	});
+	// Bottom pipe
+	var bottomPipe = self.attachAsset('pipe', {
+		anchorX: 0,
+		anchorY: 0,
+		width: self.pipeWidth,
+		height: 2732 - (self.gapY + self.gapHeight),
+		color: 0x3bb54a,
+		shape: 'box',
+		x: 0,
+		y: self.gapY + self.gapHeight
+	});
+	// For collision
+	self.topPipe = topPipe;
+	self.bottomPipe = bottomPipe;
+	// Scoring flag
+	self.passed = false;
+	// Update method
+	self.update = function () {
+		self.x -= self.speed;
+	};
+	// Collision check with bird
+	self.collidesWith = function (bird) {
+		// Bird bounding box
+		var bx = bird.x;
+		var by = bird.y;
+		var br = bird.radius;
+		// Top pipe rect
+		var tx = self.x;
+		var ty = 0;
+		var tw = self.pipeWidth;
+		var th = self.gapY;
+		// Bottom pipe rect
+		var bx2 = self.x;
+		var by2 = self.gapY + self.gapHeight;
+		var bw2 = self.pipeWidth;
+		var bh2 = 2732 - by2;
+		// Circle-rectangle collision
+		function circleRectCollide(cx, cy, cr, rx, ry, rw, rh) {
+			var closestX = Math.max(rx, Math.min(cx, rx + rw));
+			var closestY = Math.max(ry, Math.min(cy, ry + rh));
+			var dx = cx - closestX;
+			var dy = cy - closestY;
+			return dx * dx + dy * dy < cr * cr;
+		}
+		if (circleRectCollide(bx, by, br, tx, ty, tw, th)) return true;
+		if (circleRectCollide(bx, by, br, bx2, by2, bw2, bh2)) return true;
+		return false;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x87ceeb // Sky blue
+});
+
+/**** 
+* Game Code
+****/ 
+// Game constants
+var BIRD_START_X = 600;
+var BIRD_START_Y = 1200;
+var PIPE_INTERVAL = 90; // Frames between pipes
+var GROUND_HEIGHT = 180;
+// Create bird asset (ellipse)
+// Create pipe asset (box)
+// Ground asset (for collision)
+// Score text
+var scoreTxt = new Text2('0', {
+	size: 180,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Bird instance
+var bird = new Bird();
+game.addChild(bird);
+bird.x = BIRD_START_X;
+bird.y = BIRD_START_Y;
+// Ground instance
+var ground = LK.getAsset('ground', {
+	anchorX: 0,
+	anchorY: 0,
+	x: 0,
+	y: 2732 - GROUND_HEIGHT
+});
+game.addChild(ground);
+// Pipes array
+var pipes = [];
+// Game state
+var gameStarted = false;
+var gameOver = false;
+var frameCount = 0;
+// For tap/flap
+game.down = function (x, y, obj) {
+	if (gameOver) return;
+	if (!gameStarted) {
+		gameStarted = true;
+	}
+	bird.flap();
+};
+// Main update loop
+game.update = function () {
+	if (gameOver) return;
+	if (gameStarted) {
+		bird.update();
+		// Add new pipes
+		if (frameCount % PIPE_INTERVAL === 0) {
+			var pipePair = new PipePair();
+			pipePair.x = 2048;
+			game.addChild(pipePair);
+			pipes.push(pipePair);
+		}
+		// Update pipes and check for collisions
+		for (var i = pipes.length - 1; i >= 0; i--) {
+			var pipe = pipes[i];
+			pipe.update();
+			// Collision
+			if (pipe.collidesWith(bird)) {
+				endGame();
+				return;
+			}
+			// Score: when bird passes the pipe
+			if (!pipe.passed && pipe.x + pipe.pipeWidth < bird.x) {
+				pipe.passed = true;
+				LK.setScore(LK.getScore() + 1);
+				scoreTxt.setText(LK.getScore());
+			}
+			// Remove off-screen pipes
+			if (pipe.x + pipe.pipeWidth < 0) {
+				pipe.destroy();
+				pipes.splice(i, 1);
+			}
+		}
+		// Ground collision
+		if (bird.y + bird.radius > 2732 - GROUND_HEIGHT) {
+			bird.y = 2732 - GROUND_HEIGHT - bird.radius;
+			endGame();
+			return;
+		}
+		// Ceiling clamp
+		if (bird.y - bird.radius < 0) {
+			bird.y = bird.radius;
+			bird.velocityY = 0;
+		}
+		frameCount++;
+	} else {
+		// Idle bird bobbing
+		bird.y = BIRD_START_Y + Math.sin(LK.ticks / 20) * 30;
+	}
+};
+// End game function
+function endGame() {
+	if (gameOver) return;
+	gameOver = true;
+	// Flash red
+	LK.effects.flashScreen(0xff0000, 600);
+	// Show game over popup
+	LK.showGameOver();
+}
+// Reset on game restart
+game.on('destroy', function () {
+	// Clean up
+	for (var i = 0; i < pipes.length; i++) {
+		pipes[i].destroy();
+	}
+	pipes = [];
+	gameStarted = false;
+	gameOver = false;
+	frameCount = 0;
+	LK.setScore(0);
+	scoreTxt.setText('0');
+	bird.x = BIRD_START_X;
+	bird.y = BIRD_START_Y;
+	bird.velocityY = 0;
+	bird.rotation = 0;
 });
\ No newline at end of file