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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.8;
	self.flapPower = -12;
	self.maxVelocity = 15;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Flap animation
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 100
		});
		tween(birdGraphics, {
			rotation: 0.3
		}, {
			duration: 200,
			onFinish: function onFinish() {
				tween(birdGraphics, {
					rotation: 0
				}, {
					duration: 100
				});
			}
		});
	};
	self.update = function () {
		self.velocity += self.gravity;
		if (self.velocity > self.maxVelocity) {
			self.velocity = self.maxVelocity;
		}
		self.y += self.velocity;
		// Rotate bird based on velocity
		var targetRotation = Math.min(Math.max(self.velocity * 0.1, -0.5), 0.8);
		birdGraphics.rotation = targetRotation;
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.gapSize = 300;
	self.speed = -4;
	self.scored = false;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe  
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setGapPosition = function (gapY) {
		self.topPipe.y = gapY - self.gapSize / 2;
		self.bottomPipe.y = gapY + self.gapSize / 2;
		// Make bottom pipe extend to ground - position it properly and scale it
		var groundY = 2732 - 100; // Ground position
		var bottomPipeTop = gapY + self.gapSize / 2;
		var distanceToGround = groundY - bottomPipeTop;
		// Position bottom pipe at gap bottom and scale to reach ground
		self.bottomPipe.y = bottomPipeTop;
		self.bottomPipe.scaleY = distanceToGround / 800; // Scale to reach ground
		self.bottomPipe.anchorY = 0; // Anchor at top so it grows downward
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var ground;
var scoreTxt;
var gameStarted = false;
var pipeSpawnTimer = 0;
var pipeDistance = 400;
// Create bird
bird = game.addChild(new Bird());
bird.x = 300;
bird.y = 1366; // Center vertically
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100;
// Create score display
scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 200;
// Game input handler
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
	}
	bird.flap();
};
// Main game loop
game.update = function () {
	if (!gameStarted) return;
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeDistance / 4) {
		var newPipe = new Pipe();
		newPipe.x = 2048 + 60;
		// Random gap position between 300 and 2000
		var gapY = 300 + Math.random() * (2000 - 300);
		newPipe.setGapPosition(gapY);
		pipes.push(newPipe);
		game.addChild(newPipe);
		pipeSpawnTimer = 0;
	}
	// Update pipes and check collisions
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		// Track last position for scoring
		if (pipe.lastX === undefined) pipe.lastX = pipe.x;
		// Check for scoring (bird passes pipe)
		if (!pipe.scored && pipe.lastX > bird.x && pipe.x <= bird.x) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
		// Remove off-screen pipes
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Collision detection
		var birdBounds = {
			x: bird.x - 30,
			y: bird.y - 20,
			width: 60,
			height: 40
		};
		var topPipeBounds = {
			x: pipe.x - 60,
			y: 0,
			width: 120,
			height: pipe.topPipe.y
		};
		var bottomPipeBounds = {
			x: pipe.x - 60,
			y: pipe.bottomPipe.y,
			width: 120,
			height: 2732 - 100 - pipe.bottomPipe.y // Height from pipe start to ground
		};
		// Check collision with pipes
		if (birdBounds.x < topPipeBounds.x + topPipeBounds.width && birdBounds.x + birdBounds.width > topPipeBounds.x && birdBounds.y < topPipeBounds.y + topPipeBounds.height && birdBounds.y + birdBounds.height > topPipeBounds.y) {
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 500);
			LK.showGameOver();
			return;
		}
		if (birdBounds.x < bottomPipeBounds.x + bottomPipeBounds.width && birdBounds.x + birdBounds.width > bottomPipeBounds.x && birdBounds.y < bottomPipeBounds.y + bottomPipeBounds.height && birdBounds.y + birdBounds.height > bottomPipeBounds.y) {
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 500);
			LK.showGameOver();
			return;
		}
		pipe.lastX = pipe.x;
	}
	// Check ground collision
	if (bird.y + 20 >= ground.y) {
		LK.getSound('hit').play();
		LK.effects.flashScreen(0xff0000, 500);
		LK.showGameOver();
		return;
	}
	// Check ceiling collision
	if (bird.y - 20 <= 0) {
		LK.getSound('hit').play();
		LK.effects.flashScreen(0xff0000, 500);
		LK.showGameOver();
		return;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -67,12 +67,16 @@
 	});
 	self.setGapPosition = function (gapY) {
 		self.topPipe.y = gapY - self.gapSize / 2;
 		self.bottomPipe.y = gapY + self.gapSize / 2;
-		// Scale bottom pipe to reach the ground
+		// Make bottom pipe extend to ground - position it properly and scale it
 		var groundY = 2732 - 100; // Ground position
-		var distanceToGround = groundY - self.bottomPipe.y;
-		self.bottomPipe.scaleY = distanceToGround / 800; // 800 is original pipe height
+		var bottomPipeTop = gapY + self.gapSize / 2;
+		var distanceToGround = groundY - bottomPipeTop;
+		// Position bottom pipe at gap bottom and scale to reach ground
+		self.bottomPipe.y = bottomPipeTop;
+		self.bottomPipe.scaleY = distanceToGround / 800; // Scale to reach ground
+		self.bottomPipe.anchorY = 0; // Anchor at top so it grows downward
 	};
 	self.update = function () {
 		self.x += self.speed;
 	};
@@ -171,9 +175,9 @@
 		var bottomPipeBounds = {
 			x: pipe.x - 60,
 			y: pipe.bottomPipe.y,
 			width: 120,
-			height: 2732 - 100 - pipe.bottomPipe.y // Height extends to ground level
+			height: 2732 - 100 - pipe.bottomPipe.y // Height from pipe start to ground
 		};
 		// Check collision with pipes
 		if (birdBounds.x < topPipeBounds.x + topPipeBounds.width && birdBounds.x + birdBounds.width > topPipeBounds.x && birdBounds.y < topPipeBounds.y + topPipeBounds.height && birdBounds.y + birdBounds.height > topPipeBounds.y) {
 			LK.getSound('hit').play();