/**** 
* Classes
****/ 
var Dinosaur = Container.expand(function () {
	var self = Container.call(this);
	var dinoGraphics = self.attachAsset('dino', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityY = 0;
	self.gravity = 0.8;
	self.jumpPower = -18;
	self.isGrounded = false;
	self.groundY = 0;
	self.jump = function () {
		if (self.isGrounded) {
			self.velocityY = self.jumpPower;
			self.isGrounded = false;
			LK.getSound('jump').play();
		}
	};
	self.update = function () {
		// Apply gravity
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Check ground collision
		if (self.y >= self.groundY) {
			self.y = self.groundY;
			self.velocityY = 0;
			self.isGrounded = true;
		}
		// Check if fallen off screen (game over condition)
		if (self.y > 2732 + 100) {
			LK.showGameOver();
		}
	};
	return self;
});
var GroundTile = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0,
		anchorY: 0
	});
	self.update = function () {
		self.x += -gameSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xf7f7f7
});

/**** 
* Game Code
****/ 
// Game variables
var dinosaur;
var groundTiles = [];
var groundY = 2732 - 200; // Ground level
var gameSpeed = 6;
var distanceScore = 0;
// Create score display
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0x333333
});
scoreTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(scoreTxt);
// Create dinosaur
dinosaur = game.addChild(new Dinosaur());
dinosaur.x = 400;
dinosaur.y = groundY;
dinosaur.groundY = groundY;
// Create initial ground tiles
function createGroundTile(x) {
	var tile = new GroundTile();
	tile.x = x;
	tile.y = groundY;
	return tile;
}
// Initialize ground tiles to cover screen width plus extra for scrolling
for (var i = 0; i < 15; i++) {
	var tile = game.addChild(createGroundTile(i * 200));
	groundTiles.push(tile);
}
// Game input handling
game.down = function (x, y, obj) {
	dinosaur.jump();
};
// Main game update loop
game.update = function () {
	// Update distance score
	distanceScore += gameSpeed;
	var displayScore = Math.floor(distanceScore / 10);
	LK.setScore(displayScore);
	scoreTxt.setText(displayScore);
	// Manage ground tiles
	for (var i = groundTiles.length - 1; i >= 0; i--) {
		var tile = groundTiles[i];
		// Remove tiles that have scrolled off screen
		if (tile.x < -250) {
			tile.destroy();
			groundTiles.splice(i, 1);
		}
	}
	// Add new ground tiles as needed
	var lastTile = groundTiles[groundTiles.length - 1];
	if (lastTile && lastTile.x + 200 < 2048 + 200) {
		var newTile = game.addChild(createGroundTile(lastTile.x + 200));
		groundTiles.push(newTile);
	}
	// Gradually increase game speed for difficulty progression
	if (LK.ticks % 600 === 0) {
		// Every 10 seconds at 60fps
		gameSpeed += 0.5;
		for (var j = 0; j < groundTiles.length; j++) {
			groundTiles[j].scrollSpeed = -gameSpeed;
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -41,11 +41,10 @@
 	var groundGraphics = self.attachAsset('ground', {
 		anchorX: 0,
 		anchorY: 0
 	});
-	self.scrollSpeed = -6;
 	self.update = function () {
-		self.x += self.scrollSpeed;
+		self.x += -gameSpeed;
 	};
 	return self;
 });