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

/**** 
* Classes
****/ 
// Obstacle
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsAsset = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = obsAsset.width;
	self.height = obsAsset.height;
	self.speed = 0;
	self.lane = 1;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Car
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var carAsset = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = carAsset.width;
	self.height = carAsset.height;
	self.lane = 1; // 0: left, 1: center, 2: right
	self.invincible = false;
	self.invincibleTimer = 0;
	// Flash effect for invincibility
	self.setInvincible = function (duration) {
		self.invincible = true;
		self.invincibleTimer = LK.ticks + Math.floor(duration * 60 / 1000);
		tween(self, {
			alpha: 0.5
		}, {
			duration: 100,
			easing: tween.linear,
			onFinish: function onFinish() {
				tween(self, {
					alpha: 1
				}, {
					duration: 100,
					easing: tween.linear
				});
			}
		});
	};
	self.update = function () {
		if (self.invincible && LK.ticks > self.invincibleTimer) {
			self.invincible = false;
			self.alpha = 1;
		}
	};
	return self;
});
// PowerUp
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var puAsset = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = puAsset.width;
	self.height = puAsset.height;
	self.speed = 0;
	self.lane = 1;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Rival Car
var RivalCar = Container.expand(function () {
	var self = Container.call(this);
	var rivalAsset = self.attachAsset('rival', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = rivalAsset.width;
	self.height = rivalAsset.height;
	self.speed = 0;
	self.lane = 1;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// Lane positions (3 lanes)
// Car (player)
// Rival car
// Obstacle (barrier)
// Power-up (star)
// Road lane
var laneCount = 3;
var laneWidth = 400;
var laneX = [2048 / 2 - laneWidth,
// left
2048 / 2,
// center
2048 / 2 + laneWidth // right
];
// Draw road lanes (visual only)
for (var i = 0; i < laneCount + 1; i++) {
	var laneLine = LK.getAsset('lane', {
		anchorX: 0.5,
		anchorY: 0,
		x: 2048 / 2 - laneWidth * 1.5 + i * laneWidth,
		y: 0,
		scaleY: 7
	});
	laneLine.alpha = 0.2;
	game.addChild(laneLine);
}
// Player car
var player = new PlayerCar();
player.x = laneX[1];
player.y = 2732 - 400;
player.lane = 1;
game.addChild(player);
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Power-up timer text
var powerupTxt = new Text2('', {
	size: 70,
	fill: 0xFFE082
});
powerupTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(powerupTxt);
powerupTxt.y = 130;
// Game state
var rivals = [];
var obstacles = [];
var powerups = [];
var gameSpeed = 18; // pixels per frame
var spawnTimer = 0;
var powerupActive = false;
var powerupEndTick = 0;
var dragNode = null;
var lastTouchX = 0;
// Helper: Clamp lane
function clampLane(lane) {
	if (lane < 0) return 0;
	if (lane > laneCount - 1) return laneCount - 1;
	return lane;
}
// Helper: Move player to x
function movePlayerToX(x) {
	// Find closest lane
	var minDist = 99999;
	var bestLane = 1;
	for (var i = 0; i < laneCount; i++) {
		var dist = Math.abs(x - laneX[i]);
		if (dist < minDist) {
			minDist = dist;
			bestLane = i;
		}
	}
	player.lane = bestLane;
	// Tween to lane center
	tween.stop(player, {
		x: true
	});
	tween(player, {
		x: laneX[bestLane]
	}, {
		duration: 120,
		easing: tween.cubicOut
	});
}
// Touch/drag controls
game.down = function (x, y, obj) {
	// Only allow drag if touch is on player car or below it
	if (y >= player.y - player.height / 2 && y <= player.y + player.height / 2) {
		dragNode = player;
		lastTouchX = x;
	}
};
game.move = function (x, y, obj) {
	if (dragNode === player) {
		// Move car horizontally, snap to nearest lane
		movePlayerToX(x);
		lastTouchX = x;
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Spawning logic
function spawnRival() {
	var rival = new RivalCar();
	rival.lane = Math.floor(Math.random() * laneCount);
	rival.x = laneX[rival.lane];
	rival.y = -rival.height;
	rival.speed = gameSpeed + Math.random() * 4;
	rival.lastY = rival.y;
	rivals.push(rival);
	game.addChild(rival);
}
function spawnObstacle() {
	var obs = new Obstacle();
	obs.lane = Math.floor(Math.random() * laneCount);
	obs.x = laneX[obs.lane];
	obs.y = -obs.height;
	obs.speed = gameSpeed;
	obstacles.push(obs);
	game.addChild(obs);
}
function spawnPowerUp() {
	var pu = new PowerUp();
	pu.lane = Math.floor(Math.random() * laneCount);
	pu.x = laneX[pu.lane];
	pu.y = -pu.height;
	pu.speed = gameSpeed;
	powerups.push(pu);
	game.addChild(pu);
}
// Main update loop
game.update = function () {
	// Increase score over time
	if (LK.ticks % 6 === 0) {
		score += 1;
		scoreTxt.setText(score);
		// Win condition: reach 500 points
		if (score >= 500) {
			LK.showYouWin();
			return;
		}
	}
	// Power-up timer
	if (powerupActive) {
		var ticksLeft = powerupEndTick - LK.ticks;
		if (ticksLeft > 0) {
			powerupTxt.setText('Invincible: ' + Math.ceil(ticksLeft / 60) + 's');
		} else {
			powerupActive = false;
			player.invincible = false;
			player.alpha = 1;
			powerupTxt.setText('');
		}
	}
	// Player update (invincibility)
	player.update();
	// Spawn rivals, obstacles, powerups
	if (spawnTimer <= 0) {
		var r = Math.random();
		if (r < 0.45) {
			spawnRival();
		} else if (r < 0.8) {
			spawnObstacle();
		} else {
			spawnPowerUp();
		}
		spawnTimer = 36 + Math.floor(Math.random() * 30); // ~0.6s
	} else {
		spawnTimer--;
	}
	// Update rivals
	for (var i = rivals.length - 1; i >= 0; i--) {
		var rival = rivals[i];
		if (rival.lastY === undefined) rival.lastY = rival.y; // Track lastY for overtaking
		rival.update();
		// Remove if off screen
		if (rival.y > 2732 + rival.height) {
			rival.destroy();
			rivals.splice(i, 1);
			continue;
		}
		// Collision with player
		if (rival.intersects(player)) {
			if (!player.invincible) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			} else {
				// Remove rival
				rival.destroy();
				rivals.splice(i, 1);
				continue;
			}
		}
		// Overtake detection: player passes rival (player.y < rival.y, and was not before)
		if (rival.lastY < player.y && rival.y >= player.y) {
			score += 10;
			scoreTxt.setText(score);
		}
		rival.lastY = rival.y;
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		if (obs.y > 2732 + obs.height) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		if (obs.intersects(player)) {
			if (!player.invincible) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			} else {
				obs.destroy();
				obstacles.splice(i, 1);
				continue;
			}
		}
	}
	// Update powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		pu.update();
		if (pu.y > 2732 + pu.height) {
			pu.destroy();
			powerups.splice(i, 1);
			continue;
		}
		if (pu.intersects(player)) {
			// Activate invincibility for 3 seconds
			powerupActive = true;
			powerupEndTick = LK.ticks + 180;
			player.setInvincible(3000);
			powerupTxt.setText('Invincible: 3s');
			// Flash player car yellow for feedback
			LK.effects.flashObject(player, 0xffeb3b, 600);
			// Play power-up sound
			LK.getSound('shoot').play();
			pu.destroy();
			powerups.splice(i, 1);
			continue;
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -103,14 +103,14 @@
 
 /**** 
 * Game Code
 ****/ 
-// Road lane
-// Power-up (star)
-// Obstacle (barrier)
-// Rival car
-// Car (player)
 // Lane positions (3 lanes)
+// Car (player)
+// Rival car
+// Obstacle (barrier)
+// Power-up (star)
+// Road lane
 var laneCount = 3;
 var laneWidth = 400;
 var laneX = [2048 / 2 - laneWidth,
 // left
@@ -216,8 +216,9 @@
 	rival.lane = Math.floor(Math.random() * laneCount);
 	rival.x = laneX[rival.lane];
 	rival.y = -rival.height;
 	rival.speed = gameSpeed + Math.random() * 4;
+	rival.lastY = rival.y;
 	rivals.push(rival);
 	game.addChild(rival);
 }
 function spawnObstacle() {
@@ -243,8 +244,13 @@
 	// Increase score over time
 	if (LK.ticks % 6 === 0) {
 		score += 1;
 		scoreTxt.setText(score);
+		// Win condition: reach 500 points
+		if (score >= 500) {
+			LK.showYouWin();
+			return;
+		}
 	}
 	// Power-up timer
 	if (powerupActive) {
 		var ticksLeft = powerupEndTick - LK.ticks;
@@ -275,8 +281,9 @@
 	}
 	// Update rivals
 	for (var i = rivals.length - 1; i >= 0; i--) {
 		var rival = rivals[i];
+		if (rival.lastY === undefined) rival.lastY = rival.y; // Track lastY for overtaking
 		rival.update();
 		// Remove if off screen
 		if (rival.y > 2732 + rival.height) {
 			rival.destroy();
@@ -295,8 +302,14 @@
 				rivals.splice(i, 1);
 				continue;
 			}
 		}
+		// Overtake detection: player passes rival (player.y < rival.y, and was not before)
+		if (rival.lastY < player.y && rival.y >= player.y) {
+			score += 10;
+			scoreTxt.setText(score);
+		}
+		rival.lastY = rival.y;
 	}
 	// Update obstacles
 	for (var i = obstacles.length - 1; i >= 0; i--) {
 		var obs = obstacles[i];
@@ -332,8 +345,12 @@
 			powerupActive = true;
 			powerupEndTick = LK.ticks + 180;
 			player.setInvincible(3000);
 			powerupTxt.setText('Invincible: 3s');
+			// Flash player car yellow for feedback
+			LK.effects.flashObject(player, 0xffeb3b, 600);
+			// Play power-up sound
+			LK.getSound('shoot').play();
 			pu.destroy();
 			powerups.splice(i, 1);
 			continue;
 		}