===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,232 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Bird class
+var Bird = Container.expand(function () {
+	var self = Container.call(this);
+	var birdSprite = self.attachAsset('bird', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = birdSprite.width * 0.5;
+	self.vy = 0; // vertical velocity
+	// Bird physics constants
+	self.gravity = 2.2; // px per frame^2
+	self.jumpStrength = -38; // px per frame
+	// Bird update
+	self.update = function () {
+		self.vy += self.gravity;
+		self.y += self.vy;
+		// Clamp rotation for visual feedback
+		var maxAngle = Math.PI / 4;
+		var minAngle = -Math.PI / 3;
+		var targetAngle = Math.max(minAngle, Math.min(maxAngle, self.vy / 40));
+		birdSprite.rotation = targetAngle;
+	};
+	// Bird jump
+	self.flap = function () {
+		self.vy = self.jumpStrength;
+	};
+	return self;
+});
+// PipePair class
+var PipePair = Container.expand(function () {
+	var self = Container.call(this);
+	// Pipe constants
+	self.pipeWidth = 220;
+	self.gapHeight = 480;
+	self.speed = 16; // px per frame
+	// Randomize gap position
+	var minGapY = 400;
+	var maxGapY = 2732 - 400 - self.gapHeight - 120; // leave space for ground
+	self.gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY + 1));
+	// Top pipe
+	self.topPipe = self.attachAsset('pipe', {
+		anchorX: 0.5,
+		anchorY: 1.0,
+		x: 0,
+		y: self.gapY
+	});
+	// Bottom pipe
+	self.bottomPipe = self.attachAsset('pipe', {
+		anchorX: 0.5,
+		anchorY: 0.0,
+		x: 0,
+		y: self.gapY + self.gapHeight
+	});
+	// For scoring
+	self.passed = false;
+	// Update
+	self.update = function () {
+		self.x -= self.speed;
+	};
+	// Helper for collision
+	self.getTopRect = function () {
+		return new Rectangle(self.x - self.pipeWidth / 2, 0, self.pipeWidth, self.gapY);
+	};
+	self.getBottomRect = function () {
+		return new Rectangle(self.x - self.pipeWidth / 2, self.gapY + self.gapHeight, self.pipeWidth, 2732 - (self.gapY + self.gapHeight));
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87ceeb // sky blue
+});
+
+/**** 
+* Game Code
+****/ 
+// Ground: brown box
+// Pipe: green box
+// Bird: yellow ellipse
+// Game constants
+var BIRD_START_X = 600;
+var BIRD_START_Y = 1366;
+var PIPE_INTERVAL = 60; // frames between pipes
+var GROUND_Y = 2732 - 60; // ground top y
+var GROUND_HEIGHT = 120;
+// Game state
+var bird;
+var pipes = [];
+var ground;
+var score = 0;
+var scoreTxt;
+var started = false;
+var gameOver = false;
+var lastPipeTick = 0;
+// GUI score
+scoreTxt = new Text2('0', {
+	size: 160,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Ground
+ground = LK.getAsset('ground', {
+	anchorX: 0,
+	anchorY: 0,
+	x: 0,
+	y: GROUND_Y
+});
+game.addChild(ground);
+// Bird
+bird = new Bird();
+bird.x = BIRD_START_X;
+bird.y = BIRD_START_Y;
+game.addChild(bird);
+// Reset function
+function resetGame() {
+	// Remove pipes
+	for (var i = 0; i < pipes.length; i++) {
+		pipes[i].destroy();
+	}
+	pipes = [];
+	// Reset bird
+	bird.x = BIRD_START_X;
+	bird.y = BIRD_START_Y;
+	bird.vy = 0;
+	// Reset score
+	score = 0;
+	scoreTxt.setText(score);
+	started = false;
+	gameOver = false;
+	lastPipeTick = LK.ticks;
+}
+// Start game on first tap
+game.down = function (x, y, obj) {
+	if (gameOver) return;
+	if (!started) {
+		started = true;
+		bird.flap();
+		return;
+	}
+	bird.flap();
+};
+// Main update loop
+game.update = function () {
+	if (gameOver) return;
+	if (!started) {
+		// Idle bird bobbing
+		bird.y = BIRD_START_Y + Math.sin(LK.ticks / 20) * 30;
+		return;
+	}
+	// Bird physics
+	bird.update();
+	// Clamp bird to top of screen
+	if (bird.y < bird.radius) {
+		bird.y = bird.radius;
+		bird.vy = 0;
+	}
+	// Add pipes
+	if (LK.ticks - lastPipeTick >= PIPE_INTERVAL) {
+		var pipePair = new PipePair();
+		pipePair.x = 2048 + pipePair.pipeWidth / 2;
+		game.addChild(pipePair);
+		pipes.push(pipePair);
+		lastPipeTick = LK.ticks;
+	}
+	// Update pipes, check for offscreen and scoring
+	for (var i = pipes.length - 1; i >= 0; i--) {
+		var pipe = pipes[i];
+		pipe.update();
+		// Remove offscreen pipes
+		if (pipe.x < -pipe.pipeWidth / 2) {
+			pipe.destroy();
+			pipes.splice(i, 1);
+			continue;
+		}
+		// Scoring: passed center of bird
+		if (!pipe.passed && pipe.x + pipe.pipeWidth / 2 < bird.x - bird.radius) {
+			pipe.passed = true;
+			score += 1;
+			scoreTxt.setText(score);
+		}
+	}
+	// Collision detection
+	// Bird rectangle
+	var birdRect = new Rectangle(bird.x - bird.radius * 0.8, bird.y - bird.radius * 0.8, bird.radius * 1.6, bird.radius * 1.6);
+	// Check collision with pipes
+	for (var j = 0; j < pipes.length; j++) {
+		var pipe = pipes[j];
+		var topRect = pipe.getTopRect();
+		var bottomRect = pipe.getBottomRect();
+		if (rectsIntersect(birdRect, topRect) || rectsIntersect(birdRect, bottomRect)) {
+			triggerGameOver();
+			return;
+		}
+	}
+	// Check collision with ground
+	if (bird.y + bird.radius > GROUND_Y) {
+		bird.y = GROUND_Y - bird.radius;
+		triggerGameOver();
+		return;
+	}
+};
+// Rectangle intersection helper
+function rectsIntersect(r1, r2) {
+	return !(r2.x > r1.x + r1.width || r2.x + r2.width < r1.x || r2.y > r1.y + r1.height || r2.y + r2.height < r1.y);
+}
+// Game over
+function triggerGameOver() {
+	if (gameOver) return;
+	gameOver = true;
+	// Flash red
+	LK.effects.flashScreen(0xff0000, 800);
+	// Show game over popup (handled by LK)
+	LK.showGameOver();
+}
+// Reset on game over
+LK.on('gameover', function () {
+	resetGame();
+});
+// Initial reset
+resetGame();
\ No newline at end of file