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

/**** 
* Classes
****/ 
var Block = Container.expand(function () {
	var self = Container.call(this);
	var blockGraphics = self.attachAsset('block', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.speed = GAME_SPEED;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
var Cube = Container.expand(function () {
	var self = Container.call(this);
	var cubeGraphics = self.attachAsset('cube', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.isJumping = false;
	self.jumpSpeed = 0;
	self.gravity = 0.8;
	self.jumpPower = -18;
	self.groundY = GROUND_Y;
	self.jump = function () {
		if (!self.isJumping) {
			self.isJumping = true;
			self.jumpSpeed = self.jumpPower;
			LK.getSound('jump').play();
		}
	};
	self.update = function () {
		if (self.isJumping) {
			self.jumpSpeed += self.gravity;
			self.y += self.jumpSpeed;
			if (self.y >= self.groundY) {
				self.y = self.groundY;
				self.isJumping = false;
				self.jumpSpeed = 0;
			}
		}
	};
	return self;
});
var Spike = Container.expand(function () {
	var self = Container.call(this);
	var spikeGraphics = self.attachAsset('spike', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.speed = GAME_SPEED;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var GAME_SPEED = 8;
var GROUND_Y = 2400;
var OBSTACLE_SPAWN_X = 2200;
var MIN_OBSTACLE_DISTANCE = 200;
var MAX_OBSTACLE_DISTANCE = 400;
game.setBackgroundColor(0x87CEEB);
// Create ground line visual reference
var groundLine = LK.getAsset('block', {
	anchorX: 0,
	anchorY: 0,
	scaleX: 25,
	scaleY: 0.3
});
groundLine.x = 0;
groundLine.y = GROUND_Y;
game.addChild(groundLine);
// Create cube
var cube = game.addChild(new Cube());
cube.x = 300;
cube.y = GROUND_Y;
// Create score display
var scoreTxt = new Text2('Distance: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreTxt);
// Game variables
var obstacles = [];
var gameDistance = 0;
var nextObstacleDistance = 300;
var gameRunning = true;
var difficultyTimer = 0;
// Input handling
game.down = function (x, y, obj) {
	if (gameRunning) {
		cube.jump();
	}
};
// Obstacle creation
function createRandomObstacle() {
	var obstacleType = Math.random() < 0.6 ? 'spike' : 'block';
	var obstacle;
	if (obstacleType === 'spike') {
		obstacle = new Spike();
	} else {
		obstacle = new Block();
	}
	obstacle.x = OBSTACLE_SPAWN_X;
	obstacle.y = GROUND_Y;
	obstacles.push(obstacle);
	game.addChild(obstacle);
}
// Check collision between cube and obstacle
function checkCollision(cube, obstacle) {
	var cubeLeft = cube.x - 40;
	var cubeRight = cube.x + 40;
	var cubeTop = cube.y - 80;
	var cubeBottom = cube.y;
	var obstacleLeft = obstacle.x - obstacle.children[0].width * 0.5;
	var obstacleRight = obstacle.x + obstacle.children[0].width * 0.5;
	var obstacleTop = obstacle.y - obstacle.children[0].height;
	var obstacleBottom = obstacle.y;
	return cubeLeft < obstacleRight && cubeRight > obstacleLeft && cubeTop < obstacleBottom && cubeBottom > obstacleTop;
}
// Game over
function handleGameOver() {
	gameRunning = false;
	LK.getSound('hit').play();
	// Flash effect
	LK.effects.flashScreen(0xFF0000, 800);
	// Show game over after brief delay
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 500);
}
// Main game loop
game.update = function () {
	if (!gameRunning) return;
	// Update distance score
	gameDistance += GAME_SPEED / 10;
	scoreTxt.setText('Distance: ' + Math.floor(gameDistance));
	LK.setScore(Math.floor(gameDistance));
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer % 1800 === 0) {
		// Every 30 seconds at 60fps
		GAME_SPEED += 1;
		// Update obstacle speeds
		for (var i = 0; i < obstacles.length; i++) {
			obstacles[i].speed = GAME_SPEED;
		}
	}
	// Spawn obstacles
	if (gameDistance >= nextObstacleDistance) {
		createRandomObstacle();
		nextObstacleDistance = gameDistance + MIN_OBSTACLE_DISTANCE + Math.random() * (MAX_OBSTACLE_DISTANCE - MIN_OBSTACLE_DISTANCE);
	}
	// Update and check obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		// Check collision with cube
		if (checkCollision(cube, obstacle)) {
			// Check if it's a block - only kill from front collision
			if (obstacle instanceof Block) {
				// For blocks, only trigger game over if cube hits from the front
				// (cube's right side hits block's left side)
				var cubeRight = cube.x + 40;
				var blockLeft = obstacle.x - obstacle.children[0].width * 0.5;
				if (cubeRight >= blockLeft && cube.x < obstacle.x) {
					handleGameOver();
					return;
				}
			} else {
				// For spikes, collision from any angle is deadly
				handleGameOver();
				return;
			}
		}
		// Remove off-screen obstacles
		if (obstacle.x < -200) {
			obstacle.destroy();
			obstacles.splice(i, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js