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

/**** 
* Classes
****/ 
// Arrow Button class
var ArrowButton = Container.expand(function () {
	var self = Container.call(this);
	self.direction = 'left'; // 'left', 'right', 'up', 'down'
	self.arrowAsset = null;
	self.setDirection = function (dir) {
		self.direction = dir;
		if (self.arrowAsset) {
			self.removeChild(self.arrowAsset);
		}
		var assetId = 'arrow_' + dir;
		self.arrowAsset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		// Add a simple arrow "icon" using Text2
		var arrowChar = {
			'left': '←',
			'right': '→',
			'up': '↑',
			'down': '↓'
		}[dir];
		if (self.arrowText) {
			self.removeChild(self.arrowText);
		}
		self.arrowText = new Text2(arrowChar, {
			size: 120,
			fill: 0x222222
		});
		self.arrowText.anchor.set(0.5, 0.5);
		self.addChild(self.arrowText);
	};
	return self;
});
// Cat class
var Cat = Container.expand(function () {
	var self = Container.call(this);
	self.lane = 1; // start in lane 1 (from 0-3)
	self.color = 'yellow';
	self.catAsset = self.attachAsset('cat', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.setLane = function (lane) {
		self.lane = lane;
		self.x = laneCenters[lane];
	};
	self.setColor = function (color) {
		self.color = color;
		// Tint the cat to match color
		var tintMap = {
			'red': 0xff4b4b,
			'blue': 0x4b7bff,
			'green': 0x4bff7b,
			'yellow': 0xffe066
		};
		self.catAsset.tint = tintMap[color];
	};
	return self;
});
// Note class
var Note = Container.expand(function () {
	var self = Container.call(this);
	self.color = 'red'; // default, will be set on spawn
	self.lane = 0; // 0-3
	self.hit = false;
	self.setColor = function (color) {
		self.color = color;
		if (self.noteAsset) {
			self.removeChild(self.noteAsset);
		}
		var assetId = 'note_' + color;
		self.noteAsset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5
		});
	};
	self.update = function () {
		self.y += noteSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Lane setup
// Cat character: cute box, default color yellow
// Note shapes: four colors
// Lane backgrounds (for visual feedback)
// Arrow buttons
// Sound effects
// Music (looping, for rhythm)
var laneCount = 4;
var laneWidth = 400;
var laneSpacing = 32;
var laneColors = ['red', 'blue', 'green', 'yellow'];
var laneCenters = [];
var laneLeft = (2048 - (laneCount * laneWidth + (laneCount - 1) * laneSpacing)) / 2;
for (var i = 0; i < laneCount; i++) {
	laneCenters[i] = laneLeft + i * (laneWidth + laneSpacing) + laneWidth / 2;
}
// Lane backgrounds
var laneBGs = [];
for (var i = 0; i < laneCount; i++) {
	var assetId = 'lane_' + laneColors[i];
	var laneBG = LK.getAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0,
		x: laneCenters[i],
		y: 0,
		width: laneWidth,
		height: 2732
	});
	laneBG.interactive = true;
	laneBG.buttonMode = true;
	laneBG.laneIndex = i;
	laneBG.down = function (x, y, obj) {
		// Move cat to this lane if not already there
		if (cat.lane !== this.laneIndex) {
			cat.setLane(this.laneIndex);
		}
	};
	game.addChild(laneBG);
	laneBGs.push(laneBG);
}
// Cat setup
var cat = new Cat();
cat.setLane(1);
cat.setColor('yellow');
cat.y = 2732 - 350;
game.addChild(cat);
// Arrow buttons (bottom of screen, left/right/up/down)
var arrowButtons = [];
var arrowButtonSize = 180;
var arrowButtonY = 2732 - 120;
var arrowButtonSpacing = 220;
var arrowButtonXStart = 2048 / 2 - arrowButtonSpacing * 1.5;
var arrowDirs = ['left', 'right', 'up', 'down'];
for (var i = 0; i < 4; i++) {
	var btn = new ArrowButton();
	btn.setDirection(arrowDirs[i]);
	btn.x = arrowButtonXStart + i * arrowButtonSpacing;
	btn.y = arrowButtonY;
	btn.direction = arrowDirs[i];
	btn.interactive = true;
	btn.buttonMode = true;
	game.addChild(btn); // Place arrow buttons in the main game area so they are always visible
	arrowButtons.push(btn);
}
// Color change buttons (above arrow buttons)
var colorButtons = [];
var colorNames = ['red', 'blue', 'green', 'yellow'];
var colorButtonY = arrowButtonY - 220;
var colorButtonSpacing = 220;
var colorButtonXStart = 2048 / 2 - colorButtonSpacing * 1.5;
for (var i = 0; i < 4; i++) {
	var colorBtn = LK.getAsset('note_' + colorNames[i], {
		anchorX: 0.5,
		anchorY: 0.5,
		x: colorButtonXStart + i * colorButtonSpacing,
		y: colorButtonY,
		width: 140,
		height: 140
	});
	colorBtn.interactive = true;
	colorBtn.buttonMode = true;
	colorBtn.color = colorNames[i];
	game.addChild(colorBtn); // Place color buttons in the main game area so they are always visible
	colorButtons.push(colorBtn);
}
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Combo display
var comboTxt = new Text2('', {
	size: 80,
	fill: 0xFFE066
});
comboTxt.anchor.set(0.5, 0);
comboTxt.y = 130;
LK.gui.top.addChild(comboTxt);
// Notes array
var notes = [];
var noteSpeed = 18; // px per frame
var noteSpawnInterval = 36; // frames between notes (60fps ~ 0.6s)
var noteTimer = 0;
var noteColors = ['red', 'blue', 'green', 'yellow'];
// Rhythm pattern (random for now, can be improved)
function spawnNote() {
	var lane = Math.floor(Math.random() * 4);
	var color = noteColors[Math.floor(Math.random() * 4)];
	var note = new Note();
	note.setColor(color);
	note.lane = lane;
	note.x = laneCenters[lane];
	note.y = -100;
	notes.push(note);
	game.addChild(note);
}
// Hit window (distance from cat.y to note.y for a "hit")
var hitWindow = 120;
// Score/combo
var score = 0;
var combo = 0;
var maxCombo = 0;
// Input handling
function handleArrowButton(dir) {
	var newLane = cat.lane;
	if (dir === 'left') {
		newLane = Math.max(0, cat.lane - 1);
	} else if (dir === 'right') {
		newLane = Math.min(laneCount - 1, cat.lane + 1);
	} else if (dir === 'up') {
		// No vertical movement, but can add jump effect
		tween(cat, {
			y: cat.y - 60
		}, {
			duration: 80,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(cat, {
					y: 2732 - 350
				}, {
					duration: 120,
					easing: tween.easeIn
				});
			}
		});
		return;
	} else if (dir === 'down') {
		// No vertical movement, but can add crouch effect
		tween(cat, {
			y: cat.y + 40
		}, {
			duration: 80,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(cat, {
					y: 2732 - 350
				}, {
					duration: 120,
					easing: tween.easeIn
				});
			}
		});
		return;
	}
	if (newLane !== cat.lane) {
		cat.setLane(newLane);
	}
}
function handleColorButton(color) {
	cat.setColor(color);
}
// Attach input events to arrow buttons
for (var i = 0; i < arrowButtons.length; i++) {
	(function (btn) {
		btn.down = function (x, y, obj) {
			handleArrowButton(btn.direction);
		};
	})(arrowButtons[i]);
}
// Attach input events to color buttons
for (var i = 0; i < colorButtons.length; i++) {
	(function (btn) {
		btn.down = function (x, y, obj) {
			handleColorButton(btn.color);
		};
	})(colorButtons[i]);
}
// Touch input: allow swipe left/right to move cat, tap on color buttons to change color
var touchStartX = null;
var touchStartY = null;
game.down = function (x, y, obj) {
	touchStartX = x;
	touchStartY = y;
};
game.up = function (x, y, obj) {
	if (touchStartX !== null && Math.abs(x - touchStartX) > 80 && Math.abs(x - touchStartX) > Math.abs(y - touchStartY)) {
		// Horizontal swipe
		if (x < touchStartX) {
			handleArrowButton('left');
		} else {
			handleArrowButton('right');
		}
	}
	touchStartX = null;
	touchStartY = null;
};
// Main update loop
game.update = function () {
	// Spawn notes
	if (LK.ticks % noteSpawnInterval === 0) {
		spawnNote();
	}
	// Update notes
	for (var i = notes.length - 1; i >= 0; i--) {
		var note = notes[i];
		note.update();
		// Check for hit
		if (!note.hit && Math.abs(note.y - cat.y) < hitWindow && note.lane === cat.lane) {
			if (note.color === cat.color) {
				// Hit!
				note.hit = true;
				score += 1;
				combo += 1;
				if (combo > maxCombo) maxCombo = combo;
				scoreTxt.setText(score);
				comboTxt.setText(combo > 1 ? combo + ' combo!' : '');
				LK.getSound('note_hit').play();
				LK.effects.flashObject(cat, 0xffffff, 120);
				// Animate note
				tween(note, {
					scaleX: 1.5,
					scaleY: 1.5,
					alpha: 0
				}, {
					duration: 180,
					onFinish: function onFinish() {
						note.destroy();
					}
				});
				notes.splice(i, 1);
				continue;
			}
		}
		// Missed note (passed cat)
		if (!note.hit && note.y > cat.y + hitWindow) {
			note.hit = true;
			combo = 0;
			comboTxt.setText('');
			LK.getSound('note_miss').play();
			LK.effects.flashScreen(0xff4b4b, 200);
			// Animate note
			tween(note, {
				alpha: 0
			}, {
				duration: 120,
				onFinish: function onFinish() {
					note.destroy();
				}
			});
			notes.splice(i, 1);
			continue;
		}
		// Remove notes off screen
		if (note.y > 2732 + 200) {
			note.destroy();
			notes.splice(i, 1);
		}
	}
	// Win condition: score 30
	if (score >= 30) {
		LK.showYouWin();
	}
};
// Start music
LK.playMusic('bgmusic', {
	fade: {
		start: 0,
		end: 0.7,
		duration: 1200
	}
});

===================================================================
--- original.js
+++ change.js
@@ -126,8 +126,17 @@
 		y: 0,
 		width: laneWidth,
 		height: 2732
 	});
+	laneBG.interactive = true;
+	laneBG.buttonMode = true;
+	laneBG.laneIndex = i;
+	laneBG.down = function (x, y, obj) {
+		// Move cat to this lane if not already there
+		if (cat.lane !== this.laneIndex) {
+			cat.setLane(this.laneIndex);
+		}
+	};
 	game.addChild(laneBG);
 	laneBGs.push(laneBG);
 }
 // Cat setup