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

/**** 
* Classes
****/ 
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	// Randomly select car type
	var carTypes = ['enemyCar1', 'enemyCar2', 'enemyCar3'];
	var selectedType = carTypes[Math.floor(Math.random() * carTypes.length)];
	var carGraphics = self.attachAsset(selectedType, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.checkedNearMiss = false;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var carGraphics = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.targetX = 2048 / 2;
	self.currentX = 2048 / 2;
	self.update = function () {
		// Smooth movement towards target position
		var diff = self.targetX - self.currentX;
		self.currentX += diff * 0.15;
		self.x = self.currentX;
	};
	return self;
});
var RoadLine = Container.expand(function () {
	var self = Container.call(this);
	var lineGraphics = self.attachAsset('roadLine', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2d2d2d
});

/**** 
* Game Code
****/ 
// Game variables
var player;
var enemyCars = [];
var roadLines = [];
var gameSpeed = 1;
var distanceScore = 0;
var bonusScore = 0;
var totalScore = 0;
var spawnTimer = 0;
var roadLineTimer = 0;
var speedIncreaseTimer = 0;
// Difficulty system
var currentDifficulty = 'medium'; // 'easy', 'medium', 'hard'
var gameStarted = false;
var difficultySettings = {
	easy: {
		initialSpeed: 0.8,
		speedIncrease: 0.1,
		spawnRateBase: 80,
		enemySpeedMultiplier: 1.5,
		speedIncreaseInterval: 900 // 15 seconds
	},
	medium: {
		initialSpeed: 1.0,
		speedIncrease: 0.2,
		spawnRateBase: 60,
		enemySpeedMultiplier: 2.0,
		speedIncreaseInterval: 600 // 10 seconds
	},
	hard: {
		initialSpeed: 1.5,
		speedIncrease: 0.3,
		spawnRateBase: 40,
		enemySpeedMultiplier: 2.5,
		speedIncreaseInterval: 300 // 5 seconds
	}
};
// Lane positions
var lanes = [400, 700, 1000, 1300, 1648];
var laneCount = 5;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 100;
var speedTxt = new Text2('Speed: 1x', {
	size: 60,
	fill: 0xFFFF00
});
speedTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(speedTxt);
speedTxt.x = -50;
speedTxt.y = 50;
// Difficulty selection UI
var difficultyTxt = new Text2('Select Difficulty', {
	size: 100,
	fill: 0xFFFFFF
});
difficultyTxt.anchor.set(0.5, 0.5);
difficultyTxt.x = 2048 / 2;
difficultyTxt.y = 800;
game.addChild(difficultyTxt);
var easyBtn = new Text2('EASY', {
	size: 80,
	fill: 0x00FF00
});
easyBtn.anchor.set(0.5, 0.5);
easyBtn.x = 2048 / 2 - 300;
easyBtn.y = 1200;
game.addChild(easyBtn);
var mediumBtn = new Text2('MEDIUM', {
	size: 80,
	fill: 0xFFFF00
});
mediumBtn.anchor.set(0.5, 0.5);
mediumBtn.x = 2048 / 2;
mediumBtn.y = 1200;
game.addChild(mediumBtn);
var hardBtn = new Text2('HARD', {
	size: 80,
	fill: 0xFF0000
});
hardBtn.anchor.set(0.5, 0.5);
hardBtn.x = 2048 / 2 + 300;
hardBtn.y = 1200;
game.addChild(hardBtn);
var instructionTxt = new Text2('Touch a difficulty to start!', {
	size: 60,
	fill: 0xCCCCCC
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 2048 / 2;
instructionTxt.y = 1400;
game.addChild(instructionTxt);
// Initialize player
player = game.addChild(new PlayerCar());
player.x = 2048 / 2;
player.y = 2200;
player.alpha = 0.3; // Make player semi-transparent during difficulty selection
// Difficulty button handlers
easyBtn.down = function (x, y, obj) {
	startGameWithDifficulty('easy');
};
mediumBtn.down = function (x, y, obj) {
	startGameWithDifficulty('medium');
};
hardBtn.down = function (x, y, obj) {
	startGameWithDifficulty('hard');
};
function startGameWithDifficulty(difficulty) {
	currentDifficulty = difficulty;
	gameStarted = true;
	gameSpeed = difficultySettings[difficulty].initialSpeed;
	// Hide difficulty selection UI
	difficultyTxt.alpha = 0;
	easyBtn.alpha = 0;
	mediumBtn.alpha = 0;
	hardBtn.alpha = 0;
	instructionTxt.alpha = 0;
	// Show player car
	player.alpha = 1;
	// Update speed display
	speedTxt.setText('Speed: ' + gameSpeed.toFixed(1) + 'x');
	// Show difficulty indicator
	var difficultyIndicator = new Text2('Difficulty: ' + difficulty.toUpperCase(), {
		size: 50,
		fill: difficulty === 'easy' ? 0x00FF00 : difficulty === 'medium' ? 0xFFFF00 : 0xFF0000
	});
	difficultyIndicator.anchor.set(0, 0);
	LK.gui.topLeft.addChild(difficultyIndicator);
	difficultyIndicator.x = 120;
	difficultyIndicator.y = 20;
}
// Touch controls
var isDragging = false;
game.down = function (x, y, obj) {
	if (gameStarted) {
		isDragging = true;
		player.targetX = x;
	}
};
game.move = function (x, y, obj) {
	if (isDragging && gameStarted) {
		// Constrain to lanes
		var clampedX = Math.max(lanes[0], Math.min(lanes[lanes.length - 1], x));
		player.targetX = clampedX;
	}
};
game.up = function (x, y, obj) {
	if (gameStarted) {
		isDragging = false;
	}
};
// Helper functions
function spawnEnemyCar() {
	var enemy = new EnemyCar();
	var laneIndex = Math.floor(Math.random() * lanes.length);
	enemy.x = lanes[laneIndex];
	enemy.y = -100;
	enemy.speed = 8 + gameSpeed * difficultySettings[currentDifficulty].enemySpeedMultiplier;
	enemyCars.push(enemy);
	game.addChild(enemy);
}
function spawnRoadLine() {
	var line = new RoadLine();
	line.x = 2048 / 2;
	line.y = -50;
	line.speed = 10 + gameSpeed * 2;
	roadLines.push(line);
	game.addChild(line);
}
function checkNearMiss(enemy) {
	if (!enemy.checkedNearMiss) {
		var distance = Math.abs(player.x - enemy.x);
		var verticalDistance = Math.abs(player.y - enemy.y);
		if (distance < 150 && verticalDistance < 200) {
			enemy.checkedNearMiss = true;
			bonusScore += 10;
			totalScore += 10;
			// Visual effect for near miss
			LK.effects.flashObject(enemy, 0xffff00, 200);
			LK.getSound('nearMiss').play();
			return true;
		}
	}
	return false;
}
function updateScore() {
	distanceScore = Math.floor(LK.ticks / 10);
	totalScore = distanceScore + bonusScore;
	LK.setScore(totalScore);
	scoreTxt.setText('Score: ' + totalScore);
}
function updateSpeed() {
	speedIncreaseTimer++;
	var interval = difficultySettings[currentDifficulty].speedIncreaseInterval;
	if (speedIncreaseTimer >= interval) {
		gameSpeed += difficultySettings[currentDifficulty].speedIncrease;
		speedIncreaseTimer = 0;
		speedTxt.setText('Speed: ' + gameSpeed.toFixed(1) + 'x');
	}
}
// Main game loop
game.update = function () {
	if (!gameStarted) {
		return; // Don't update game logic until difficulty is selected
	}
	updateScore();
	updateSpeed();
	// Spawn enemy cars
	spawnTimer++;
	var baseSpawnRate = difficultySettings[currentDifficulty].spawnRateBase;
	var spawnRate = Math.max(baseSpawnRate - gameSpeed * 10, 20); // Faster spawning as speed increases
	if (spawnTimer >= spawnRate) {
		spawnEnemyCar();
		spawnTimer = 0;
	}
	// Spawn road lines
	roadLineTimer++;
	if (roadLineTimer >= 20) {
		spawnRoadLine();
		roadLineTimer = 0;
	}
	// Update and check enemy cars
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var enemy = enemyCars[i];
		// Check for collision
		if (enemy.intersects(player)) {
			// Game over
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('crash').play();
			LK.showGameOver();
			return;
		}
		// Check for near miss
		checkNearMiss(enemy);
		// Remove off-screen enemies
		if (enemy.y > 2800) {
			enemy.destroy();
			enemyCars.splice(i, 1);
		}
	}
	// Update and clean up road lines
	for (var j = roadLines.length - 1; j >= 0; j--) {
		var line = roadLines[j];
		if (line.y > 2800) {
			line.destroy();
			roadLines.splice(j, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -71,8 +71,34 @@
 var totalScore = 0;
 var spawnTimer = 0;
 var roadLineTimer = 0;
 var speedIncreaseTimer = 0;
+// Difficulty system
+var currentDifficulty = 'medium'; // 'easy', 'medium', 'hard'
+var gameStarted = false;
+var difficultySettings = {
+	easy: {
+		initialSpeed: 0.8,
+		speedIncrease: 0.1,
+		spawnRateBase: 80,
+		enemySpeedMultiplier: 1.5,
+		speedIncreaseInterval: 900 // 15 seconds
+	},
+	medium: {
+		initialSpeed: 1.0,
+		speedIncrease: 0.2,
+		spawnRateBase: 60,
+		enemySpeedMultiplier: 2.0,
+		speedIncreaseInterval: 600 // 10 seconds
+	},
+	hard: {
+		initialSpeed: 1.5,
+		speedIncrease: 0.3,
+		spawnRateBase: 40,
+		enemySpeedMultiplier: 2.5,
+		speedIncreaseInterval: 300 // 5 seconds
+	}
+};
 // Lane positions
 var lanes = [400, 700, 1000, 1300, 1648];
 var laneCount = 5;
 // UI Elements
@@ -90,35 +116,115 @@
 speedTxt.anchor.set(1, 0);
 LK.gui.topRight.addChild(speedTxt);
 speedTxt.x = -50;
 speedTxt.y = 50;
+// Difficulty selection UI
+var difficultyTxt = new Text2('Select Difficulty', {
+	size: 100,
+	fill: 0xFFFFFF
+});
+difficultyTxt.anchor.set(0.5, 0.5);
+difficultyTxt.x = 2048 / 2;
+difficultyTxt.y = 800;
+game.addChild(difficultyTxt);
+var easyBtn = new Text2('EASY', {
+	size: 80,
+	fill: 0x00FF00
+});
+easyBtn.anchor.set(0.5, 0.5);
+easyBtn.x = 2048 / 2 - 300;
+easyBtn.y = 1200;
+game.addChild(easyBtn);
+var mediumBtn = new Text2('MEDIUM', {
+	size: 80,
+	fill: 0xFFFF00
+});
+mediumBtn.anchor.set(0.5, 0.5);
+mediumBtn.x = 2048 / 2;
+mediumBtn.y = 1200;
+game.addChild(mediumBtn);
+var hardBtn = new Text2('HARD', {
+	size: 80,
+	fill: 0xFF0000
+});
+hardBtn.anchor.set(0.5, 0.5);
+hardBtn.x = 2048 / 2 + 300;
+hardBtn.y = 1200;
+game.addChild(hardBtn);
+var instructionTxt = new Text2('Touch a difficulty to start!', {
+	size: 60,
+	fill: 0xCCCCCC
+});
+instructionTxt.anchor.set(0.5, 0.5);
+instructionTxt.x = 2048 / 2;
+instructionTxt.y = 1400;
+game.addChild(instructionTxt);
 // Initialize player
 player = game.addChild(new PlayerCar());
 player.x = 2048 / 2;
 player.y = 2200;
+player.alpha = 0.3; // Make player semi-transparent during difficulty selection
+// Difficulty button handlers
+easyBtn.down = function (x, y, obj) {
+	startGameWithDifficulty('easy');
+};
+mediumBtn.down = function (x, y, obj) {
+	startGameWithDifficulty('medium');
+};
+hardBtn.down = function (x, y, obj) {
+	startGameWithDifficulty('hard');
+};
+function startGameWithDifficulty(difficulty) {
+	currentDifficulty = difficulty;
+	gameStarted = true;
+	gameSpeed = difficultySettings[difficulty].initialSpeed;
+	// Hide difficulty selection UI
+	difficultyTxt.alpha = 0;
+	easyBtn.alpha = 0;
+	mediumBtn.alpha = 0;
+	hardBtn.alpha = 0;
+	instructionTxt.alpha = 0;
+	// Show player car
+	player.alpha = 1;
+	// Update speed display
+	speedTxt.setText('Speed: ' + gameSpeed.toFixed(1) + 'x');
+	// Show difficulty indicator
+	var difficultyIndicator = new Text2('Difficulty: ' + difficulty.toUpperCase(), {
+		size: 50,
+		fill: difficulty === 'easy' ? 0x00FF00 : difficulty === 'medium' ? 0xFFFF00 : 0xFF0000
+	});
+	difficultyIndicator.anchor.set(0, 0);
+	LK.gui.topLeft.addChild(difficultyIndicator);
+	difficultyIndicator.x = 120;
+	difficultyIndicator.y = 20;
+}
 // Touch controls
 var isDragging = false;
 game.down = function (x, y, obj) {
-	isDragging = true;
-	player.targetX = x;
+	if (gameStarted) {
+		isDragging = true;
+		player.targetX = x;
+	}
 };
 game.move = function (x, y, obj) {
-	if (isDragging) {
+	if (isDragging && gameStarted) {
 		// Constrain to lanes
 		var clampedX = Math.max(lanes[0], Math.min(lanes[lanes.length - 1], x));
 		player.targetX = clampedX;
 	}
 };
 game.up = function (x, y, obj) {
-	isDragging = false;
+	if (gameStarted) {
+		isDragging = false;
+	}
 };
 // Helper functions
 function spawnEnemyCar() {
 	var enemy = new EnemyCar();
 	var laneIndex = Math.floor(Math.random() * lanes.length);
 	enemy.x = lanes[laneIndex];
 	enemy.y = -100;
-	enemy.speed = 8 + gameSpeed * 2;
+	enemy.speed = 8 + gameSpeed * difficultySettings[currentDifficulty].enemySpeedMultiplier;
 	enemyCars.push(enemy);
 	game.addChild(enemy);
 }
 function spawnRoadLine() {
@@ -152,22 +258,26 @@
 	scoreTxt.setText('Score: ' + totalScore);
 }
 function updateSpeed() {
 	speedIncreaseTimer++;
-	if (speedIncreaseTimer >= 600) {
-		// Every 10 seconds at 60fps
-		gameSpeed += 0.2;
+	var interval = difficultySettings[currentDifficulty].speedIncreaseInterval;
+	if (speedIncreaseTimer >= interval) {
+		gameSpeed += difficultySettings[currentDifficulty].speedIncrease;
 		speedIncreaseTimer = 0;
 		speedTxt.setText('Speed: ' + gameSpeed.toFixed(1) + 'x');
 	}
 }
 // Main game loop
 game.update = function () {
+	if (!gameStarted) {
+		return; // Don't update game logic until difficulty is selected
+	}
 	updateScore();
 	updateSpeed();
 	// Spawn enemy cars
 	spawnTimer++;
-	var spawnRate = Math.max(60 - gameSpeed * 10, 30); // Faster spawning as speed increases
+	var baseSpawnRate = difficultySettings[currentDifficulty].spawnRateBase;
+	var spawnRate = Math.max(baseSpawnRate - gameSpeed * 10, 20); // Faster spawning as speed increases
 	if (spawnTimer >= spawnRate) {
 		spawnEnemyCar();
 		spawnTimer = 0;
 	}