/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	level: 1,
	bestTime: 0
});

/**** 
* Classes
****/ 
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carGraphics = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		// Player car does not move forward automatically anymore
		// Only horizontal movement is allowed, so no change to self.y here
		if (self.x < 0) {
			self.x = 2048;
		} else if (self.x > 2048) {
			self.x = 0;
		}
	};
	return self;
});
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var enemyCarGraphics = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		// Enemy cars move down the screen (already correct)
		self.y += self.speed;
		if (self.x < 0) {
			self.x = 2048;
		} else if (self.x > 2048) {
			self.x = 0;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
var road = LK.getAsset('road', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1366
});
game.addChild(road);
var playerCar = game.addChild(new Car());
// Place player in left or right lane randomly, not center
playerCar.x = Math.random() > 0.5 ? 512 : 1536; // 512 = left lane, 1536 = right lane
playerCar.y = 2300; // Start near the bottom, adjusted for bigger car
var enemyCars = [];
function spawnEnemyCar() {
	// Determine which lane the player is currently in, and spawn enemy cars so that the other lane is always open
	var playerLane = playerCar.x < 1024 ? 'left' : 'right';
	var enemyCar1, enemyCar2;
	// Randomly choose gap size: wide or narrow, but always enough for player to fit
	var carGap = Math.random() > 0.5 ? 900 : 500; // 900px = wide, 500px = narrow, both > car width
	var yBase = -330;
	if (playerLane === 'left') {
		// Player is in left lane, so spawn enemy car only in right lane at jumpable Y
		enemyCar1 = new EnemyCar();
		enemyCar1.x = 1536;
		enemyCar1.y = yBase;
		enemyCars.push(enemyCar1);
		game.addChild(enemyCar1);
		// Optionally, spawn another enemy car in left lane but much further up, so player can jump to right safely
		enemyCar2 = new EnemyCar();
		enemyCar2.x = 512;
		enemyCar2.y = yBase - carGap; // variable vertical gap
		enemyCars.push(enemyCar2);
		game.addChild(enemyCar2);
	} else {
		// Player is in right lane, so spawn enemy car only in left lane at jumpable Y
		enemyCar1 = new EnemyCar();
		enemyCar1.x = 512;
		enemyCar1.y = yBase;
		enemyCars.push(enemyCar1);
		game.addChild(enemyCar1);
		// Optionally, spawn another enemy car in right lane but much further up, so player can jump to left safely
		enemyCar2 = new EnemyCar();
		enemyCar2.x = 1536;
		enemyCar2.y = yBase - carGap; // variable vertical gap
		enemyCars.push(enemyCar2);
		game.addChild(enemyCar2);
	}
}
game.update = function () {
	// No gradual movement needed; handled instantly in game.down
	// Only update playerCar for horizontal movement, not forward movement
	playerCar.update();
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var enemyCar = enemyCars[i];
		enemyCar.update();
		if (enemyCar.y > 2832) {
			// If the enemy car goes off the screen
			enemyCar.destroy();
			enemyCars.splice(i, 1);
		}
		if (playerCar.intersects(enemyCar)) {
			LK.showGameOver();
		}
	}
	if (LK.ticks % 120 == 0) {
		// Spawn new enemy cars every 2 seconds to keep more space between them
		spawnEnemyCar();
	}
};
var inputState = {
	leftPressed: false,
	rightPressed: false
};
game.down = function (x, y, obj) {
	if (x < 1024) {
		inputState.leftPressed = true;
		// Leap effect: create a fading trail behind the car
		createLeapEffect(playerCar.x, playerCar.y);
		playerCar.x = 512; // Instantly move to left lane
		inputState.rightPressed = false;
	} else {
		inputState.rightPressed = true;
		// Leap effect: create a fading trail behind the car
		createLeapEffect(playerCar.x, playerCar.y);
		playerCar.x = 1536; // Instantly move to right lane
		inputState.leftPressed = false;
	}
};
game.up = function (x, y, obj) {
	inputState.leftPressed = false;
	inputState.rightPressed = false;
};
// Creates a leap effect behind the car at (x, y)
function createLeapEffect(x, y) {
	// Use a semi-transparent white ellipse as the leap effect
	var effect = LK.getAsset('centerCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: x,
		y: y + 100,
		// slightly behind the car
		scaleX: 2.5,
		scaleY: 1.2,
		alpha: 0.5
	});
	game.addChild(effect);
	// Animate the effect to fade out and grow, then destroy
	tween.to(effect, {
		alpha: 0,
		scaleX: 4,
		scaleY: 2
	}, 350, {
		onComplete: function onComplete() {
			effect.destroy();
		}
	});
}

===================================================================
--- original.js
+++ change.js
@@ -72,32 +72,35 @@
 function spawnEnemyCar() {
 	// Determine which lane the player is currently in, and spawn enemy cars so that the other lane is always open
 	var playerLane = playerCar.x < 1024 ? 'left' : 'right';
 	var enemyCar1, enemyCar2;
+	// Randomly choose gap size: wide or narrow, but always enough for player to fit
+	var carGap = Math.random() > 0.5 ? 900 : 500; // 900px = wide, 500px = narrow, both > car width
+	var yBase = -330;
 	if (playerLane === 'left') {
 		// Player is in left lane, so spawn enemy car only in right lane at jumpable Y
 		enemyCar1 = new EnemyCar();
 		enemyCar1.x = 1536;
-		enemyCar1.y = -330;
+		enemyCar1.y = yBase;
 		enemyCars.push(enemyCar1);
 		game.addChild(enemyCar1);
 		// Optionally, spawn another enemy car in left lane but much further up, so player can jump to right safely
 		enemyCar2 = new EnemyCar();
 		enemyCar2.x = 512;
-		enemyCar2.y = -330 - 800; // 800px vertical gap
+		enemyCar2.y = yBase - carGap; // variable vertical gap
 		enemyCars.push(enemyCar2);
 		game.addChild(enemyCar2);
 	} else {
 		// Player is in right lane, so spawn enemy car only in left lane at jumpable Y
 		enemyCar1 = new EnemyCar();
 		enemyCar1.x = 512;
-		enemyCar1.y = -330;
+		enemyCar1.y = yBase;
 		enemyCars.push(enemyCar1);
 		game.addChild(enemyCar1);
 		// Optionally, spawn another enemy car in right lane but much further up, so player can jump to left safely
 		enemyCar2 = new EnemyCar();
 		enemyCar2.x = 1536;
-		enemyCar2.y = -330 - 800; // 800px vertical gap
+		enemyCar2.y = yBase - carGap; // variable vertical gap
 		enemyCars.push(enemyCar2);
 		game.addChild(enemyCar2);
 	}
 }
@@ -128,16 +131,45 @@
 };
 game.down = function (x, y, obj) {
 	if (x < 1024) {
 		inputState.leftPressed = true;
+		// Leap effect: create a fading trail behind the car
+		createLeapEffect(playerCar.x, playerCar.y);
 		playerCar.x = 512; // Instantly move to left lane
 		inputState.rightPressed = false;
 	} else {
 		inputState.rightPressed = true;
+		// Leap effect: create a fading trail behind the car
+		createLeapEffect(playerCar.x, playerCar.y);
 		playerCar.x = 1536; // Instantly move to right lane
 		inputState.leftPressed = false;
 	}
 };
 game.up = function (x, y, obj) {
 	inputState.leftPressed = false;
 	inputState.rightPressed = false;
-};
\ No newline at end of file
+};
+// Creates a leap effect behind the car at (x, y)
+function createLeapEffect(x, y) {
+	// Use a semi-transparent white ellipse as the leap effect
+	var effect = LK.getAsset('centerCircle', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		x: x,
+		y: y + 100,
+		// slightly behind the car
+		scaleX: 2.5,
+		scaleY: 1.2,
+		alpha: 0.5
+	});
+	game.addChild(effect);
+	// Animate the effect to fade out and grow, then destroy
+	tween.to(effect, {
+		alpha: 0,
+		scaleX: 4,
+		scaleY: 2
+	}, 350, {
+		onComplete: function onComplete() {
+			effect.destroy();
+		}
+	});
+}
\ No newline at end of file