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

/**** 
* Classes
****/ 
// Car class
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carSprite = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For possible future effects
	self.flash = function () {
		LK.effects.flashObject(self, 0xffffff, 200);
	};
	return self;
});
// LaneLine class (for visual effect)
var LaneLine = Container.expand(function () {
	var self = Container.call(this);
	var lineSprite = self.attachAsset('laneLine', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
// Note class
var Note = Container.expand(function () {
	var self = Container.call(this);
	// Randomly use note1, note2, note3, note4, note5, note6, note7, or note8 asset
	var noteRand = Math.random();
	var noteAssetId;
	if (noteRand < 1 / 8) {
		noteAssetId = 'note1';
	} else if (noteRand < 2 / 8) {
		noteAssetId = 'note2';
	} else if (noteRand < 3 / 8) {
		noteAssetId = 'note3';
	} else if (noteRand < 4 / 8) {
		noteAssetId = 'note4';
	} else if (noteRand < 5 / 8) {
		noteAssetId = 'note5';
	} else if (noteRand < 6 / 8) {
		noteAssetId = 'note6';
	} else if (noteRand < 7 / 8) {
		noteAssetId = 'note7';
	} else {
		noteAssetId = 'note8';
	}
	var noteSprite = self.attachAsset(noteAssetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Lane index (0,1,2)
	self.lane = 1;
	// For state tracking
	self.lastY = undefined;
	self.lastIntersecting = false;
	self.assetId = noteAssetId;
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsSprite = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Lane index (0,1,2)
	self.lane = 1;
	// For state tracking
	self.lastY = undefined;
	self.lastIntersecting = false;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0a0020 // Deep synthwave night
});

/**** 
* Game Code
****/ 
// Sounds and music (IDs are placeholders, engine will load as used)
// Neon synthwave colors
// --- Game constants ---
var NUM_LANES = 3;
var LANE_WIDTH = 410; // 2048 / 3 ≈ 682, but leave margins for neon effect
var ROAD_TOP = 400;
var ROAD_BOTTOM = 2732 - 200;
var CAR_Y = 2200;
var BASE_SPEED = 22;
var SPEED_INCREMENT = 0.1;
var OBSTACLE_SPEED = BASE_SPEED;
var NOTE_SPEED = BASE_SPEED;
var LANE_X = [410,
// left
1024,
// center
1638 // right
];
// --- Music BPM and spawn sync ---
var BPM = 120; // Example BPM, can be changed if music changes
// Spawn interval: 0.75 seconds = 45 frames at 60fps
var BEAT_INTERVAL = 45;
var lastBeatTick = 0;
// --- Game state ---
var car = null;
var carLane = 1; // 0: left, 1: center, 2: right
var obstacles = [];
var notes = [];
var laneLines = [];
var score = 0;
var scoreTxt = null;
var dragSide = null; // 'left' or 'right' for touch controls
// --- Background music ---
LK.playMusic('neonTrack');
// --- Draw neon road lanes ---
function createLaneLines() {
	// Remove old lines
	for (var i = 0; i < laneLines.length; i++) {
		laneLines[i].destroy();
	}
	laneLines = [];
	// Draw vertical lines between lanes
	for (var i = 1; i < NUM_LANES; i++) {
		var x = (LANE_X[i - 1] + LANE_X[i]) / 2;
		for (var y = ROAD_TOP; y < ROAD_BOTTOM; y += 400) {
			var line = new LaneLine();
			line.x = x;
			line.y = y;
			line.alpha = 0.25;
			game.addChild(line);
			laneLines.push(line);
		}
	}
}
createLaneLines();
// --- Create car ---
car = new Car();
car.x = LANE_X[carLane];
car.y = CAR_Y;
game.addChild(car);
// --- Score display ---
scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFF200,
	font: "Impact"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Touch controls ---
// Touch/click left or right half of screen to move car
function handleDown(x, y, obj) {
	// Only respond to touches below the top 200px (avoid menu)
	if (y < 200) return;
	if (x < 1024) {
		dragSide = 'left';
		moveCar(-1);
	} else {
		dragSide = 'right';
		moveCar(1);
	}
}
function handleUp(x, y, obj) {
	dragSide = null;
}
function handleMove(x, y, obj) {
	// Optional: swipe to move, but for now, tap only
}
game.down = handleDown;
game.up = handleUp;
game.move = handleMove;
// --- Move car between lanes ---
function moveCar(dir) {
	var newLane = carLane + dir;
	if (newLane < 0) newLane = 0;
	if (newLane > 2) newLane = 2;
	if (newLane !== carLane) {
		carLane = newLane;
		// Animate car to new lane
		tween(car, {
			x: LANE_X[carLane]
		}, {
			duration: 120,
			easing: tween.cubicOut
		});
	}
}
// --- Spawn obstacles and notes in sync with music ---
function spawnBeatObjects() {
	// Randomly decide: 1 or 2 obstacles, and 0 or 1 note
	var availableLanes = [0, 1, 2];
	// Place 1 or 2 obstacles
	var numObstacles = Math.random() < 0.5 ? 1 : 2;
	for (var i = 0; i < numObstacles; i++) {
		if (availableLanes.length === 0) break;
		var idx = Math.floor(Math.random() * availableLanes.length);
		var lane = availableLanes[idx];
		availableLanes.splice(idx, 1);
		var obs = new Obstacle();
		obs.lane = lane;
		obs.x = LANE_X[lane];
		obs.y = ROAD_TOP - 100;
		obs.lastY = obs.y;
		obs.lastIntersecting = false;
		obstacles.push(obs);
		game.addChild(obs);
	}
	// Place a note in a random free lane (if any)
	if (availableLanes.length > 0 && Math.random() < 0.7) {
		var idx = Math.floor(Math.random() * availableLanes.length);
		var lane = availableLanes[idx];
		var note = new Note();
		note.lane = lane;
		note.x = LANE_X[lane];
		note.y = ROAD_TOP - 100;
		note.lastY = note.y;
		note.lastIntersecting = false;
		notes.push(note);
		game.addChild(note);
	}
}
// --- Main game update loop ---
game.update = function () {
	// Animate lane lines for neon effect
	for (var i = 0; i < laneLines.length; i++) {
		laneLines[i].y += OBSTACLE_SPEED;
		if (laneLines[i].y > ROAD_BOTTOM + 200) {
			laneLines[i].y = ROAD_TOP - 200;
		}
	}
	// Spawn obstacles/notes on beat
	if (LK.ticks - lastBeatTick >= BEAT_INTERVAL) {
		spawnBeatObjects();
		lastBeatTick = LK.ticks;
	}
	// Move obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.y += OBSTACLE_SPEED;
		// Off-screen removal
		if (obs.lastY < 2800 && obs.y >= 2800) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision detection
		var isIntersecting = obs.intersects(car);
		if (!obs.lastIntersecting && isIntersecting) {
			// Crash!
			LK.effects.flashScreen(0xff2a6d, 800);
			car.flash();
			LK.showGameOver();
			return;
		}
		obs.lastY = obs.y;
		obs.lastIntersecting = isIntersecting;
	}
	// Move notes
	for (var i = notes.length - 1; i >= 0; i--) {
		var note = notes[i];
		note.y += NOTE_SPEED;
		// Off-screen removal
		if (note.lastY < 2800 && note.y >= 2800) {
			note.destroy();
			notes.splice(i, 1);
			continue;
		}
		// Collect note
		var isIntersecting = note.intersects(car);
		if (!note.lastIntersecting && isIntersecting) {
			// Collect!
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			// Increase speed by 0.1 each time score increases
			OBSTACLE_SPEED = BASE_SPEED + LK.getScore() * SPEED_INCREMENT;
			NOTE_SPEED = BASE_SPEED + LK.getScore() * SPEED_INCREMENT;
			// Only play NoteDo sound if this is note1 asset
			if (note.assetId === 'note1') {
				LK.getSound('NoteDo').play();
			}
			// Only play NoteRe sound if this is note2 asset
			if (note.assetId === 'note2') {
				LK.getSound('NoteRe').play();
			}
			// Only play NoteMi sound if this is note3 asset
			if (note.assetId === 'note3') {
				LK.getSound('NoteMi').play();
			}
			// Only play NoteFa sound if this is note4 asset
			if (note.assetId === 'note4') {
				LK.getSound('NoteFa').play();
			}
			// Only play NoteSol sound if this is note5 asset
			if (note.assetId === 'note5') {
				LK.getSound('NoteSol').play();
			}
			// Only play NoteLa sound if this is note6 asset
			if (note.assetId === 'note6') {
				LK.getSound('NoteLa').play();
			}
			// Only play NoteSi sound if this is note7 asset
			if (note.assetId === 'note7') {
				LK.getSound('NoteSi').play();
			}
			// Only play NoteThickDo sound if this is note8 asset
			if (note.assetId === 'note8') {
				LK.getSound('NoteThickDo').play();
			}
			// Neon flash
			LK.effects.flashObject(car, 0xfff200, 200);
			note.destroy();
			notes.splice(i, 1);
			continue;
		}
		note.lastY = note.y;
		note.lastIntersecting = isIntersecting;
	}
};
// --- Set initial score ---
LK.setScore(0);
scoreTxt.setText('0');

===================================================================
--- original.js
+++ change.js
@@ -95,13 +95,12 @@
 var LANE_WIDTH = 410; // 2048 / 3 ≈ 682, but leave margins for neon effect
 var ROAD_TOP = 400;
 var ROAD_BOTTOM = 2732 - 200;
 var CAR_Y = 2200;
-var BASE_OBSTACLE_SPEED = 22; // px per frame
-var BASE_NOTE_SPEED = 22;
-var speedMultiplier = 1;
-var OBSTACLE_SPEED = BASE_OBSTACLE_SPEED * speedMultiplier;
-var NOTE_SPEED = BASE_NOTE_SPEED * speedMultiplier;
+var BASE_SPEED = 22;
+var SPEED_INCREMENT = 0.1;
+var OBSTACLE_SPEED = BASE_SPEED;
+var NOTE_SPEED = BASE_SPEED;
 var LANE_X = [410,
 // left
 1024,
 // center
@@ -280,12 +279,11 @@
 		if (!note.lastIntersecting && isIntersecting) {
 			// Collect!
 			LK.setScore(LK.getScore() + 1);
 			scoreTxt.setText(LK.getScore());
-			// Increase speed by 1/2 (multiply by 1.5) every time score increases
-			speedMultiplier *= 1.5;
-			OBSTACLE_SPEED = BASE_OBSTACLE_SPEED * speedMultiplier;
-			NOTE_SPEED = BASE_NOTE_SPEED * speedMultiplier;
+			// Increase speed by 0.1 each time score increases
+			OBSTACLE_SPEED = BASE_SPEED + LK.getScore() * SPEED_INCREMENT;
+			NOTE_SPEED = BASE_SPEED + LK.getScore() * SPEED_INCREMENT;
 			// Only play NoteDo sound if this is note1 asset
 			if (note.assetId === 'note1') {
 				LK.getSound('NoteDo').play();
 			}