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

/**** 
* Classes
****/ 
var Note = Container.expand(function (trackIndex, isPowerNote) {
	var self = Container.call(this);
	self.trackIndex = trackIndex;
	self.isPowerNote = isPowerNote || false;
	self.speed = 8;
	self.hasBeenTapped = false;
	self.lastY = 0;
	var noteGraphics = self.attachAsset(self.isPowerNote ? 'powerNote' : 'note', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	if (self.isPowerNote) {
		noteGraphics.tint = 0xFFD93D;
		self.scale.set(1.2);
	}
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speed;
	};
	self.checkTiming = function () {
		var targetY = targetZones[self.trackIndex].y;
		var distance = Math.abs(self.y - targetY);
		if (distance <= 30) {
			return 'perfect';
		} else if (distance <= 60) {
			return 'good';
		}
		return 'miss';
	};
	return self;
});
var TargetZone = Container.expand(function (trackIndex) {
	var self = Container.call(this);
	self.trackIndex = trackIndex;
	var zoneGraphics = self.attachAsset('targetZone', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	zoneGraphics.alpha = 0.3;
	self.flash = function () {
		zoneGraphics.alpha = 0.8;
		tween(zoneGraphics, {
			alpha: 0.3
		}, {
			duration: 200
		});
	};
	return self;
});
var Track = Container.expand(function (trackIndex) {
	var self = Container.call(this);
	self.trackIndex = trackIndex;
	var trackGraphics = self.attachAsset('track', {
		anchorX: 0.5,
		anchorY: 0
	});
	trackGraphics.alpha = 0.1;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
// Game variables
var notes = [];
var tracks = [];
var targetZones = [];
var numTracks = 3;
var trackWidth = 500;
var gameWidth = 2048;
var score = 0;
var combo = 0;
var maxCombo = 0;
var missedNotes = 0;
var maxMissedNotes = 5;
var noteSpawnTimer = 0;
var noteSpawnInterval = 45;
var gameSpeed = 1;
var difficultyTimer = 0;
// UI elements
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var comboTxt = new Text2('Combo: 0', {
	size: 50,
	fill: 0xFFD93D
});
comboTxt.anchor.set(0, 0);
comboTxt.x = 150;
comboTxt.y = 150;
LK.gui.top.addChild(comboTxt);
var missedTxt = new Text2('Missed: 0/5', {
	size: 40,
	fill: 0xFF6B6B
});
missedTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(missedTxt);
// Add background image
var background = LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0
});
background.x = 0;
background.y = 0;
game.addChild(background);
// Add ground background strip from top to bottom at ground level width
var groundBackground = LK.getAsset('track', {
	anchorX: 0.5,
	anchorY: 0
});
groundBackground.x = gameWidth / 2;
groundBackground.y = 0;
groundBackground.width = numTracks * trackWidth;
groundBackground.height = 2732;
groundBackground.alpha = 0.15;
game.addChild(groundBackground);
// Initialize tracks and target zones
var startX = (gameWidth - numTracks * trackWidth) / 2 + trackWidth / 2;
for (var i = 0; i < numTracks; i++) {
	var track = new Track(i);
	track.x = startX + i * trackWidth;
	track.y = 0;
	tracks.push(track);
	game.addChild(track);
	var targetZone = new TargetZone(i);
	targetZone.x = startX + i * trackWidth;
	targetZone.y = 1800;
	targetZones.push(targetZone);
	game.addChild(targetZone);
	// Add strip line for each track
	var stripLine = LK.getAsset('stripLine', {
		anchorX: 0.5,
		anchorY: 0
	});
	stripLine.x = startX + i * trackWidth;
	stripLine.y = 0;
	stripLine.alpha = 0.8;
	game.addChild(stripLine);
}
// Helper functions
function spawnNote() {
	var trackIndex = Math.floor(Math.random() * numTracks);
	var isPowerNote = Math.random() < 0.1;
	var note = new Note(trackIndex, isPowerNote);
	note.x = startX + trackIndex * trackWidth;
	note.y = -50;
	note.speed = 8 * gameSpeed;
	notes.push(note);
	game.addChild(note);
}
function updateScore(points) {
	score += points * Math.max(1, Math.floor(combo / 5));
	scoreTxt.setText('Score: ' + score);
	LK.setScore(score);
}
function updateCombo(increase) {
	if (increase) {
		combo++;
		maxCombo = Math.max(maxCombo, combo);
	} else {
		combo = 0;
	}
	comboTxt.setText('Combo: ' + combo);
}
function updateMissed() {
	missedNotes++;
	missedTxt.setText('Missed: ' + missedNotes + '/' + maxMissedNotes);
	if (missedNotes >= maxMissedNotes) {
		LK.showGameOver();
	}
}
function showPerfectEffect(x, y) {
	var effect = LK.getAsset('perfectEffect', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	effect.x = x;
	effect.y = y;
	effect.alpha = 0.8;
	game.addChild(effect);
	tween(effect, {
		alpha: 0,
		scaleX: 2,
		scaleY: 2
	}, {
		duration: 300,
		onFinish: function onFinish() {
			effect.destroy();
		}
	});
}
function checkNoteInTrack(trackIndex) {
	for (var i = 0; i < notes.length; i++) {
		var note = notes[i];
		if (note.trackIndex === trackIndex && !note.hasBeenTapped) {
			var timing = note.checkTiming();
			if (timing !== 'miss') {
				note.hasBeenTapped = true;
				var points = 0;
				if (timing === 'perfect') {
					points = note.isPowerNote ? 200 : 100;
					LK.getSound('perfect').play();
					showPerfectEffect(note.x, note.y);
				} else if (timing === 'good') {
					points = note.isPowerNote ? 100 : 50;
					LK.getSound('tap').play();
				}
				updateScore(points);
				updateCombo(true);
				targetZones[trackIndex].flash();
				// Add shake effect to strip line
				var stripLine = game.children.find(function (child) {
					return child.x === startX + trackIndex * trackWidth && child.width === 8;
				});
				if (stripLine) {
					var originalX = stripLine.x;
					tween(stripLine, {
						x: originalX + 50
					}, {
						duration: 25,
						onFinish: function onFinish() {
							tween(stripLine, {
								x: originalX - 50
							}, {
								duration: 25,
								onFinish: function onFinish() {
									tween(stripLine, {
										x: originalX + 35
									}, {
										duration: 25,
										onFinish: function onFinish() {
											tween(stripLine, {
												x: originalX - 35
											}, {
												duration: 25,
												onFinish: function onFinish() {
													tween(stripLine, {
														x: originalX + 20
													}, {
														duration: 20,
														onFinish: function onFinish() {
															tween(stripLine, {
																x: originalX - 20
															}, {
																duration: 20,
																onFinish: function onFinish() {
																	tween(stripLine, {
																		x: originalX + 10
																	}, {
																		duration: 15,
																		onFinish: function onFinish() {
																			tween(stripLine, {
																				x: originalX
																			}, {
																				duration: 15
																			});
																		}
																	});
																}
															});
														}
													});
												}
											});
										}
									});
								}
							});
						}
					});
				}
				note.destroy();
				notes.splice(i, 1);
				return true;
			}
		}
	}
	return false;
}
// Touch handlers
game.down = function (x, y, obj) {
	for (var i = 0; i < numTracks; i++) {
		var trackX = startX + i * trackWidth;
		if (x >= trackX - trackWidth / 2 && x <= trackX + trackWidth / 2) {
			if (!checkNoteInTrack(i)) {
				updateCombo(false);
				LK.getSound('miss').play();
			}
			break;
		}
	}
};
// Main game loop
game.update = function () {
	// Spawn notes
	noteSpawnTimer++;
	if (noteSpawnTimer >= noteSpawnInterval) {
		spawnNote();
		noteSpawnTimer = 0;
	}
	// Update difficulty
	difficultyTimer++;
	if (difficultyTimer >= 1800) {
		// Every 30 seconds
		gameSpeed += 0.2;
		noteSpawnInterval = Math.max(20, noteSpawnInterval - 2);
		difficultyTimer = 0;
	}
	// Update notes
	for (var i = notes.length - 1; i >= 0; i--) {
		var note = notes[i];
		// Check if note missed target zone
		if (!note.hasBeenTapped && note.lastY <= 1900 && note.y > 1900) {
			updateCombo(false);
			updateMissed();
			note.destroy();
			notes.splice(i, 1);
			continue;
		}
		// Remove notes that are off screen
		if (note.y > 2800) {
			note.destroy();
			notes.splice(i, 1);
		}
	}
	// Win condition
	if (score >= 10000) {
		LK.showYouWin();
	}
};
// Start background music
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -120,8 +120,19 @@
 });
 background.x = 0;
 background.y = 0;
 game.addChild(background);
+// Add ground background strip from top to bottom at ground level width
+var groundBackground = LK.getAsset('track', {
+	anchorX: 0.5,
+	anchorY: 0
+});
+groundBackground.x = gameWidth / 2;
+groundBackground.y = 0;
+groundBackground.width = numTracks * trackWidth;
+groundBackground.height = 2732;
+groundBackground.alpha = 0.15;
+game.addChild(groundBackground);
 // Initialize tracks and target zones
 var startX = (gameWidth - numTracks * trackWidth) / 2 + trackWidth / 2;
 for (var i = 0; i < numTracks; i++) {
 	var track = new Track(i);