/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	creations: [],
	lastCreation: "undefined"
});

/**** 
* Classes
****/ 
var BuildingBlock = Container.expand(function () {
	var self = Container.call(this);
	var blockGraphics = self.attachAsset('buildingBlock', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.blockSize = 100;
	self.blockType = 'standard';
	self.gridX = 0;
	self.gridY = 0;
	self.setColor = function (color) {
		blockGraphics.tint = color;
	};
	self.setSize = function (size) {
		self.blockSize = size;
		blockGraphics.width = size;
		blockGraphics.height = size;
	};
	self.setType = function (type) {
		self.blockType = type;
	};
	self.setGridPosition = function (x, y) {
		self.gridX = x;
		self.gridY = y;
	};
	self.down = function (x, y, obj) {
		if (currentMode === 'build') {
			selectedBlock = self;
			originalPosition = {
				x: self.x,
				y: self.y
			};
			isDragging = true;
		} else if (currentMode === 'play') {
			// In play mode, interacting with blocks could trigger game mechanics 
			// For simple MVP, we just acknowledge the interaction 
			console.log("Interacted with block at", self.gridX, self.gridY);
			LK.getSound('place').play(); // Play sound on interaction
		} else if (currentMode === 'study') {
			var index = blocks.indexOf(self);
			if (index > -1) {
				blocks.splice(index, 1);
				self.destroy();
				LK.getSound('delete').play();
			}
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('playerCharacter', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = {
		x: 0,
		y: 0
	};
	self.onGround = false;
	self.speed = 10;
	self.jumpPower = 20;
	self.gravity = 1;
	self.update = function () {
		if (self.isAI) {
			// AI logic to move in any direction and walk on the ground
			if (Math.random() < 0.01) {
				// Randomly change direction
				self.velocity.x = (Math.random() < 0.5 ? -1 : 1) * self.speed;
			}
			if (self.onGround && Math.random() < 0.01) {
				// Randomly jump if on ground
				self.velocity.y = -self.jumpPower;
			}
		}
		if (currentMode !== 'play') {
			return;
		}
		// Apply gravity
		self.velocity.y += self.gravity;
		// Apply velocity
		self.x += self.velocity.x;
		self.y += self.velocity.y;
		// Add movement effect
		if (self.velocity.x !== 0 || self.velocity.y !== 0) {
			if (!self.lastWasMoving) {
				LK.getSound('footstep').play(); // Play footstep sound when player starts moving
			}
			LK.effects.flashObject(self, 0xFFFFFF, 100);
			self.lastWasMoving = true;
		} else {
			self.lastWasMoving = false;
		}
		// Check collisions with blocks
		self.checkCollisions();
		// Screen boundaries
		if (self.x < 40) {
			self.x = 40;
		}
		if (self.x > 2048 - 40) {
			self.x = 2048 - 40;
		}
		if (self.y > 2732 - 60) {
			self.y = 2732 - 60;
			self.velocity.y = 0;
			self.onGround = true;
		}
	};
	self.checkCollisions = function () {
		self.onGround = false;
		for (var i = 0; i < blocks.length; i++) {
			var block = blocks[i];
			if (self.intersects(block)) {
				// Determine collision side (simple version)
				var dx = self.x - block.x;
				var dy = self.y - block.y;
				var width = (self.width + block.width) / 2;
				var height = (self.height + block.height) / 2;
				var crossWidth = width * dy;
				var crossHeight = height * dx;
				if (Math.abs(dx) <= width && Math.abs(dy) <= height) {
					if (crossWidth > crossHeight) {
						if (crossWidth > -crossHeight) {
							// Bottom collision
							self.y = block.y + block.height / 2 + self.height / 2;
							self.velocity.y = 0;
						} else {
							// Left collision
							self.x = block.x - block.width / 2 - self.width / 2;
							self.velocity.x = 0;
						}
					} else {
						if (crossWidth > -crossHeight) {
							// Right collision
							self.x = block.x + block.width / 2 + self.width / 2;
							self.velocity.x = 0;
						} else {
							// Top collision
							self.y = block.y - block.height / 2 - self.height / 2;
							self.velocity.y = 0;
							self.onGround = true;
						}
					}
				}
			}
		}
	};
	self.jump = function () {
		if (self.onGround && currentMode === 'play') {
			self.velocity.y = -self.jumpPower;
			self.onGround = false;
		}
	};
	self.moveLeft = function () {
		if (currentMode === 'play') {
			self.velocity.x = -self.speed;
		}
	};
	self.moveRight = function () {
		if (currentMode === 'play') {
			self.velocity.x = self.speed;
		}
	};
	self.stopMoving = function () {
		self.velocity.x = 0;
	};
	return self;
});
var UIButton = Container.expand(function (iconAsset, callback) {
	var self = Container.call(this);
	var buttonGraphics = self.attachAsset(iconAsset, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.active = false;
	self.callback = callback;
	self.setActive = function (active) {
		self.active = active;
		buttonGraphics.alpha = active ? 1.0 : 0.6;
	};
	self.down = function (x, y, obj) {
		tween(buttonGraphics, {
			scaleX: 0.9,
			scaleY: 0.9
		}, {
			duration: 100
		});
	};
	self.up = function (x, y, obj) {
		tween(buttonGraphics, {
			scaleX: 1.0,
			scaleY: 1.0
		}, {
			duration: 100
		});
		if (self.callback) {
			self.callback();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Function to start the game
function startGame() {
	switchMode('play');
}
// Function to add a new player
function addPlayer() {
	var newPlayer = new Player();
	LK.getSound('place').play(); // Play sound when a new player is added
	newPlayer.isAI = true;
	newPlayer.x = Math.random() * 2048;
	newPlayer.y = Math.random() * 2732;
	game.addChild(newPlayer);
}
// Game variables
var currentMode = 'build';
var gridSize = 100;
var blocks = [];
var isDragging = false;
var selectedBlock = null;
var originalPosition = {
	x: 0,
	y: 0
};
var player = null;
var buildModeButton = null;
var playModeButton = null;
var deleteButton = null;
var saveButton = null;
var loadButton = null;
var modeTitleText = null;
var controlsText = null;
var blockColorIndex = 0;
var blockColors = [0x3498db, 0xe74c3c, 0xf1c40f, 0x2ecc71, 0x9b59b6, 0x1abc9c, 0xd35400, 0x34495e];
// Setup UI
function setupUI() {
	// Mode title text
	modeTitleText = new Text2('BUILD MODE', {
		size: 60,
		fill: 0xFFFFFF
	});
	modeTitleText.anchor.set(0.5, 0);
	LK.gui.top.addChild(modeTitleText);
	modeTitleText.y = 30;
	// Controls text
	controlsText = new Text2('Tap to place blocks\nDrag blocks to move them', {
		size: 40,
		fill: 0xFFFFFF
	});
	controlsText.anchor.set(0.5, 1);
	LK.gui.bottom.addChild(controlsText);
	controlsText.y = -30;
	// Build mode button
	buildModeButton = new UIButton('buildModeIcon', function () {
		switchMode('build');
	});
	buildModeButton.x = 2048 - 200;
	buildModeButton.y = 80;
	game.addChild(buildModeButton);
	buildModeButton.setActive(true);
	// Play mode button
	playModeButton = new UIButton('playModeIcon', function () {
		switchMode('play');
	});
	playModeButton.x = 2048 - 120;
	playModeButton.y = 80;
	game.addChild(playModeButton);
	// Delete button
	deleteButton = new UIButton('deleteIcon', function () {
		if (currentMode === 'build' && selectedBlock) {
			var index = blocks.indexOf(selectedBlock);
			if (index > -1) {
				blocks.splice(index, 1);
				selectedBlock.destroy();
				selectedBlock = null;
				LK.getSound('delete').play();
			}
		}
	});
	deleteButton.x = 180;
	deleteButton.y = 80;
	game.addChild(deleteButton);
	// Save button
	saveButton = new UIButton('saveIcon', saveCreation);
	saveButton.x = 2048 - 200;
	saveButton.y = 160;
	game.addChild(saveButton);
	// Load button
	loadButton = new UIButton('loadIcon', loadCreation);
	loadButton.x = 2048 - 120;
	loadButton.y = 160;
	game.addChild(loadButton);
	// Add Player button
	var addPlayerButton = new UIButton('playerCharacter', function () {
		addPlayer();
	});
	addPlayerButton.x = 2048 - 280;
	addPlayerButton.y = 80;
	game.addChild(addPlayerButton);
	// Study mode button
	var studyModeButton = new UIButton('buildModeIcon', function () {
		switchMode('study');
	});
	studyModeButton.x = 2048 - 440;
	studyModeButton.y = 80;
	game.addChild(studyModeButton);
	// Start Game button
	var startGameButton = new UIButton('playModeIcon', function () {
		startGame();
	});
	startGameButton.x = 2048 - 360;
	startGameButton.y = 80;
	game.addChild(startGameButton);
}
// Create player character
function createPlayer() {
	player = new Player();
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	game.addChild(player);
}
// Switch between build and play modes
function switchMode(mode) {
	if (currentMode === mode) {
		return;
	}
	currentMode = mode;
	LK.getSound('switch').play();
	if (mode === 'build') {
		modeTitleText.setText('BUILD MODE');
		controlsText.setText('Tap to place blocks\nDrag blocks to move them');
		buildModeButton.setActive(true);
		playModeButton.setActive(false);
		// Reset player position
		if (player) {
			player.x = 2048 / 2;
			player.y = 2732 / 2;
			player.velocity = {
				x: 0,
				y: 0
			};
		}
	} else if (mode === 'study') {
		modeTitleText.setText('STUDY MODE');
		controlsText.setText('Tap blocks to delete them');
		buildModeButton.setActive(false);
		playModeButton.setActive(false);
		// Deselect any selected block
		selectedBlock = null;
		isDragging = false;
	} else {
		modeTitleText.setText('PLAY MODE');
		controlsText.setText('Tap left/right side to move\nTap player to jump');
		buildModeButton.setActive(false);
		playModeButton.setActive(true);
		// Deselect any selected block
		selectedBlock = null;
		isDragging = false;
	}
}
// Create a new block at the specified grid position
function createBlock(gridX, gridY, color) {
	var x = gridX * gridSize + gridSize / 2;
	var y = gridY * gridSize + gridSize / 2;
	// Check if a block already exists at this position
	for (var i = 0; i < blocks.length; i++) {
		if (blocks[i].gridX === gridX && blocks[i].gridY === gridY) {
			return null;
		}
	}
	var block = new BuildingBlock();
	block.x = x;
	block.y = y;
	block.setGridPosition(gridX, gridY);
	if (color !== undefined) {
		block.setColor(color);
	} else {
		block.setColor(blockColors[blockColorIndex]);
		blockColorIndex = (blockColorIndex + 1) % blockColors.length;
	}
	blocks.push(block);
	game.addChild(block);
	LK.getSound('place').play();
	return block;
}
// Save the current creation to storage
function saveCreation() {
	var blockData = blocks.map(function (block) {
		return {
			x: block.gridX,
			y: block.gridY,
			color: block.children[0].tint
		};
	});
	var creation = {
		name: "Creation " + (storage.creations.length + 1),
		blocks: blockData,
		date: Date.now()
	};
	if (typeof storage.lastCreation === 'undefined') {
		storage.lastCreation = {};
	}
	storage.lastCreation = creation;
	storage.creations.push(creation);
	// Show saved message
	var savedText = new Text2('Creation Saved!', {
		size: 60,
		fill: 0xFFFFFF
	});
	savedText.anchor.set(0.5, 0.5);
	savedText.x = 2048 / 2;
	savedText.y = 2732 / 2;
	game.addChild(savedText);
	tween(savedText, {
		alpha: 0
	}, {
		duration: 1500,
		onFinish: function onFinish() {
			savedText.destroy();
		}
	});
}
// Load a creation from storage
function loadCreation() {
	if (!storage.lastCreation) {
		return;
	}
	// Clear existing blocks
	for (var i = blocks.length - 1; i >= 0; i--) {
		blocks[i].destroy();
	}
	blocks = [];
	// Load saved blocks
	var saved = storage.lastCreation;
	if (saved.blocks && Array.isArray(saved.blocks)) {
		saved.blocks.forEach(function (blockData) {
			createBlock(blockData.x, blockData.y, blockData.color);
		});
	}
	// Show loaded message
	var loadedText = new Text2('Creation Loaded!', {
		size: 60,
		fill: 0xFFFFFF
	});
	loadedText.anchor.set(0.5, 0.5);
	loadedText.x = 2048 / 2;
	loadedText.y = 2732 / 2;
	game.addChild(loadedText);
	tween(loadedText, {
		alpha: 0
	}, {
		duration: 1500,
		onFinish: function onFinish() {
			loadedText.destroy();
		}
	});
}
// Convert screen position to grid position
function screenToGrid(x, y) {
	return {
		x: Math.floor(x / gridSize),
		y: Math.floor(y / gridSize)
	};
}
// Initialize game
function initGame() {
	setupUI();
	createPlayer();
	// Create ground
	for (var i = 0; i < 10; i++) {
		var ground = new BuildingBlock();
		ground.x = i * 200 + 100;
		ground.y = 2732 - 50;
		ground.setGridPosition(i, Math.floor(2732 / gridSize) - 1);
		ground.children[0].width = 200;
		ground.children[0].height = 50;
		ground.children[0].tint = 0x27ae60;
		blocks.push(ground);
		game.addChild(ground);
	}
	// Start background music only if there are players
	if (game.children.some(function (child) {
		return child instanceof Player;
	})) {
		LK.playMusic('bgmusic');
		// Play crowd sound if there are multiple players
		if (game.children.filter(function (child) {
			return child instanceof Player;
		}).length > 1) {
			LK.getSound('crowd').play();
		}
	}
}
// Handle game input
game.down = function (x, y, obj) {
	if (currentMode === 'build' && !isDragging && !selectedBlock) {
		var gridPos = screenToGrid(x, y);
		// Don't create blocks too high (leave space for UI)
		if (gridPos.y > 2) {
			createBlock(gridPos.x, gridPos.y);
		}
	} else if (currentMode === 'play') {
		// Control the player in play mode
		if (x < 2048 / 2) {
			player.moveLeft();
		} else {
			player.moveRight();
		}
		// Jump if clicked on player
		if (obj === player) {
			player.jump();
		}
	}
};
game.up = function (x, y, obj) {
	if (currentMode === 'build' && isDragging) {
		isDragging = false;
		if (selectedBlock) {
			// Snap to grid
			var gridPos = screenToGrid(selectedBlock.x, selectedBlock.y);
			// Check if position is occupied
			var isOccupied = false;
			for (var i = 0; i < blocks.length; i++) {
				if (blocks[i] !== selectedBlock && blocks[i].gridX === gridPos.x && blocks[i].gridY === gridPos.y) {
					isOccupied = true;
					break;
				}
			}
			if (isOccupied || gridPos.y <= 2) {
				// Return to original position
				selectedBlock.x = originalPosition.x;
				selectedBlock.y = originalPosition.y;
			} else {
				// Set to new grid position
				selectedBlock.x = gridPos.x * gridSize + gridSize / 2;
				selectedBlock.y = gridPos.y * gridSize + gridSize / 2;
				selectedBlock.setGridPosition(gridPos.x, gridPos.y);
			}
			selectedBlock = null;
		}
	} else if (currentMode === 'play') {
		player.stopMoving();
	}
};
game.move = function (x, y, obj) {
	if (currentMode === 'build' && isDragging && selectedBlock) {
		selectedBlock.x = x;
		selectedBlock.y = y;
	}
};
game.update = function () {
	// Update game state
	if (player) {
		player.update();
	}
};
// Initialize the game
initGame();

===================================================================
--- original.js
+++ change.js
@@ -94,10 +94,15 @@
 		self.x += self.velocity.x;
 		self.y += self.velocity.y;
 		// Add movement effect
 		if (self.velocity.x !== 0 || self.velocity.y !== 0) {
+			if (!self.lastWasMoving) {
+				LK.getSound('footstep').play(); // Play footstep sound when player starts moving
+			}
 			LK.effects.flashObject(self, 0xFFFFFF, 100);
-			LK.getSound('footstep').play(); // Play footstep sound when player moves
+			self.lastWasMoving = true;
+		} else {
+			self.lastWasMoving = false;
 		}
 		// Check collisions with blocks
 		self.checkCollisions();
 		// Screen boundaries