===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,589 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+var storage = LK.import("@upit/storage.v1", {
+	unlockedSkins: [0],
+	collectedSacks: {},
+	currentLevel: 1,
+	totalSacks: 0
+});
+
+/**** 
+* Classes
+****/ 
+// Character
+var Character = Container.expand(function () {
+	var self = Container.call(this);
+	self.skinId = 0;
+	self.sprite = null;
+	self.vx = 0;
+	self.vy = 0;
+	self.onGround = false;
+	self.jumpQueued = false;
+	self.width = 100;
+	self.height = 100;
+	self.setSkin = function (skinId) {
+		if (self.sprite) {
+			self.removeChild(self.sprite);
+		}
+		self.skinId = skinId;
+		self.sprite = self.attachAsset('char_skin_' + skinId, {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
+		self.width = self.sprite.width;
+		self.height = self.sprite.height;
+	};
+	self.init = function (skinId) {
+		self.setSkin(skinId);
+		self.x = 200;
+		self.y = 200;
+		self.vx = 0;
+		self.vy = 0;
+		self.onGround = false;
+		self.jumpQueued = false;
+	};
+	self.update = function () {
+		// Physics handled in main game loop
+	};
+	return self;
+});
+/**** 
+* Level Data
+****/ 
+// For MVP, define a few sample levels. Each level: {platforms:[], sacks:[], portal:{x,y}, spawn:{x,y}}
+// Platform (static or moving)
+var Platform = Container.expand(function () {
+	var self = Container.call(this);
+	self.isMoving = false;
+	self.moveDir = 1;
+	self.moveAxis = 'x';
+	self.moveRange = 0;
+	self.moveSpeed = 0;
+	self.startPos = {
+		x: 0,
+		y: 0
+	};
+	self.init = function (data) {
+		// data: {x, y, width, height, moving, axis, range, speed}
+		var assetId = data.moving ? 'platform_moving' : 'platform';
+		var plat = self.attachAsset(assetId, {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			width: data.width,
+			height: data.height
+		});
+		self.x = data.x;
+		self.y = data.y;
+		self.width = data.width;
+		self.height = data.height;
+		self.isMoving = !!data.moving;
+		if (self.isMoving) {
+			self.moveAxis = data.axis || 'x';
+			self.moveRange = data.range || 0;
+			self.moveSpeed = data.speed || 0;
+			self.startPos.x = data.x;
+			self.startPos.y = data.y;
+		}
+	};
+	self.update = function () {
+		if (self.isMoving) {
+			var t = Math.sin(LK.ticks * self.moveSpeed / 60) * self.moveRange;
+			if (self.moveAxis === 'x') {
+				self.x = self.startPos.x + t;
+			} else {
+				self.y = self.startPos.y + t;
+			}
+		}
+	};
+	return self;
+});
+// Portal (level exit)
+var Portal = Container.expand(function () {
+	var self = Container.call(this);
+	var portal = self.attachAsset('portal', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = 0;
+	self.y = 0;
+	self.init = function (data) {
+		self.x = data.x;
+		self.y = data.y;
+	};
+	return self;
+});
+// Sack collectible
+var Sack = Container.expand(function () {
+	var self = Container.call(this);
+	var sack = self.attachAsset('sack', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.collected = false;
+	self.level = 1;
+	self.sackId = 0; // unique per level
+	self.init = function (data) {
+		self.x = data.x;
+		self.y = data.y;
+		self.level = data.level;
+		self.sackId = data.sackId;
+		self.collected = false;
+		sack.alpha = 1;
+	};
+	self.collect = function () {
+		if (!self.collected) {
+			self.collected = true;
+			tween(sack, {
+				alpha: 0
+			}, {
+				duration: 300,
+				onFinish: function onFinish() {
+					self.visible = false;
+				}
+			});
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x222222
+});
+
+/**** 
+* Game Code
+****/ 
+// For MVP, define a few sample levels. Each level: {platforms:[], sacks:[], portal:{x,y}, spawn:{x,y}}
+/**** 
+* Level Data
+****/ 
+// Character skins (15 colors)
+// Portal (level exit)
+// Sack collectible
+// Moving platform
+// Platform (static)
+// --- Global State ---
+var LEVELS = [
+// Level 1
+{
+	platforms: [{
+		x: 1024,
+		y: 2600,
+		width: 800,
+		height: 60
+	},
+	// ground
+	{
+		x: 600,
+		y: 2200,
+		width: 400,
+		height: 60
+	}, {
+		x: 1400,
+		y: 2000,
+		width: 400,
+		height: 60
+	}, {
+		x: 1024,
+		y: 1700,
+		width: 400,
+		height: 60,
+		moving: true,
+		axis: 'x',
+		range: 200,
+		speed: 1.2
+	}],
+	sacks: [{
+		x: 600,
+		y: 2100,
+		sackId: 0
+	}, {
+		x: 1400,
+		y: 1900,
+		sackId: 1
+	}],
+	portal: {
+		x: 1024,
+		y: 1550
+	},
+	spawn: {
+		x: 1024,
+		y: 2500
+	}
+},
+// Level 2
+{
+	platforms: [{
+		x: 1024,
+		y: 2600,
+		width: 800,
+		height: 60
+	}, {
+		x: 400,
+		y: 2200,
+		width: 400,
+		height: 60,
+		moving: true,
+		axis: 'y',
+		range: 150,
+		speed: 1.5
+	}, {
+		x: 1648,
+		y: 2200,
+		width: 400,
+		height: 60,
+		moving: true,
+		axis: 'y',
+		range: 150,
+		speed: 1.5
+	}, {
+		x: 1024,
+		y: 1800,
+		width: 400,
+		height: 60
+	}],
+	sacks: [{
+		x: 400,
+		y: 2100,
+		sackId: 0
+	}, {
+		x: 1648,
+		y: 2100,
+		sackId: 1
+	}, {
+		x: 1024,
+		y: 1700,
+		sackId: 2
+	}],
+	portal: {
+		x: 1024,
+		y: 1650
+	},
+	spawn: {
+		x: 1024,
+		y: 2500
+	}
+}
+// ... up to 200 levels in future
+];
+var currentLevel = storage.currentLevel || 1;
+var unlockedSkins = storage.unlockedSkins || [0];
+var selectedSkin = unlockedSkins[0];
+var collectedSacks = storage.collectedSacks || {};
+var totalSacks = storage.totalSacks || 0;
+var character = null;
+var platforms = [];
+var sacks = [];
+var portal = null;
+var levelData = null;
+var isTouching = false;
+var touchStartX = 0,
+	touchStartY = 0;
+var moveDir = 0; // -1 left, 1 right, 0 none
+var jumpPressed = false;
+var canJump = false;
+var cameraY = 0;
+var levelText = null;
+var sackText = null;
+var skinText = null;
+var skinSelectNodes = [];
+var skinSelectActive = false;
+// --- UI ---
+function updateSackText() {
+	var collected = 0,
+		total = 0;
+	if (levelData && levelData.sacks) {
+		total = levelData.sacks.length;
+		var key = 'L' + currentLevel;
+		var arr = collectedSacks[key] || [];
+		for (var i = 0; i < arr.length; ++i) if (arr[i]) collected++;
+	}
+	sackText.setText('Sacks: ' + collected + '/' + total);
+}
+function updateLevelText() {
+	levelText.setText('Level ' + currentLevel);
+}
+function updateSkinText() {
+	skinText.setText('Skins: ' + unlockedSkins.length + '/15');
+}
+// --- UI Elements ---
+levelText = new Text2('Level 1', {
+	size: 90,
+	fill: "#fff"
+});
+levelText.anchor.set(0.5, 0);
+LK.gui.top.addChild(levelText);
+sackText = new Text2('Sacks: 0/0', {
+	size: 90,
+	fill: "#fff"
+});
+sackText.anchor.set(0.5, 0);
+LK.gui.top.addChild(sackText);
+skinText = new Text2('Skins: 1/15', {
+	size: 70,
+	fill: "#fff"
+});
+skinText.anchor.set(0.5, 0);
+LK.gui.bottom.addChild(skinText);
+// --- Skin Select UI ---
+function showSkinSelect() {
+	if (skinSelectActive) return;
+	skinSelectActive = true;
+	for (var i = 0; i < 15; ++i) {
+		var node = LK.getAsset('char_skin_' + i, {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			scaleX: 0.7,
+			scaleY: 0.7
+		});
+		node.x = 300 + i * 120;
+		node.y = 400;
+		node.alpha = unlockedSkins.indexOf(i) !== -1 ? 1 : 0.3;
+		node.skinId = i;
+		node.interactive = true;
+		node.down = function (x, y, obj) {
+			if (unlockedSkins.indexOf(obj.skinId) !== -1) {
+				selectedSkin = obj.skinId;
+				storage.selectedSkin = selectedSkin;
+				character.setSkin(selectedSkin);
+				hideSkinSelect();
+			}
+		};
+		skinSelectNodes.push(node);
+		LK.gui.center.addChild(node);
+	}
+}
+function hideSkinSelect() {
+	skinSelectActive = false;
+	for (var i = 0; i < skinSelectNodes.length; ++i) {
+		LK.gui.center.removeChild(skinSelectNodes[i]);
+	}
+	skinSelectNodes = [];
+}
+// --- Level Loading ---
+function loadLevel(n) {
+	// Clean up previous
+	for (var i = 0; i < platforms.length; ++i) game.removeChild(platforms[i]);
+	for (var i = 0; i < sacks.length; ++i) game.removeChild(sacks[i]);
+	if (portal) game.removeChild(portal);
+	platforms = [];
+	sacks = [];
+	portal = null;
+	cameraY = 0;
+	// Clamp level
+	if (n < 1) n = 1;
+	if (n > LEVELS.length) n = LEVELS.length;
+	currentLevel = n;
+	storage.currentLevel = currentLevel;
+	levelData = LEVELS[n - 1];
+	// Platforms
+	for (var i = 0; i < levelData.platforms.length; ++i) {
+		var p = new Platform();
+		p.init(levelData.platforms[i]);
+		platforms.push(p);
+		game.addChild(p);
+	}
+	// Sacks
+	var key = 'L' + currentLevel;
+	if (!collectedSacks[key]) collectedSacks[key] = [];
+	for (var i = 0; i < levelData.sacks.length; ++i) {
+		var s = new Sack();
+		var data = levelData.sacks[i];
+		s.init({
+			x: data.x,
+			y: data.y,
+			level: currentLevel,
+			sackId: data.sackId
+		});
+		if (collectedSacks[key][data.sackId]) {
+			s.collected = true;
+			s.visible = false;
+		}
+		sacks.push(s);
+		game.addChild(s);
+	}
+	// Portal
+	portal = new Portal();
+	portal.init(levelData.portal);
+	game.addChild(portal);
+	// Character
+	if (!character) {
+		character = new Character();
+		character.init(selectedSkin);
+		game.addChild(character);
+	} else {
+		character.init(selectedSkin);
+	}
+	character.x = levelData.spawn.x;
+	character.y = levelData.spawn.y;
+	updateLevelText();
+	updateSackText();
+	updateSkinText();
+}
+// --- Physics/Collision ---
+function rectsIntersect(a, b) {
+	return a.x - a.width / 2 < b.x + b.width / 2 && a.x + a.width / 2 > b.x - b.width / 2 && a.y - a.height / 2 < b.y + b.height / 2 && a.y + a.height / 2 > b.y - b.height / 2;
+}
+// --- Touch Controls ---
+// Touch left half: move left. Right half: move right. Tap top 1/3: jump. Tap bottom: open skin select.
+game.down = function (x, y, obj) {
+	if (skinSelectActive) return;
+	isTouching = true;
+	touchStartX = x;
+	touchStartY = y;
+	var w = 2048,
+		h = 2732;
+	if (y > h - 300) {
+		// Bottom area: open skin select
+		showSkinSelect();
+		return;
+	}
+	if (y < h / 3) {
+		// Top: jump
+		jumpPressed = true;
+		return;
+	}
+	if (x < w / 2) {
+		moveDir = -1;
+	} else {
+		moveDir = 1;
+	}
+};
+game.up = function (x, y, obj) {
+	isTouching = false;
+	moveDir = 0;
+	jumpPressed = false;
+};
+game.move = function (x, y, obj) {
+	// Not used for movement, but could be for drag controls
+};
+// --- Main Game Loop ---
+game.update = function () {
+	// Update moving platforms
+	for (var i = 0; i < platforms.length; ++i) {
+		platforms[i].update();
+	}
+	// Character physics
+	var g = 2.2;
+	var maxVy = 40;
+	var maxVx = 18;
+	var accel = 2.5;
+	var friction = 0.85;
+	var jumpV = -38;
+	var c = character;
+	// Horizontal movement
+	if (moveDir !== 0) {
+		c.vx += moveDir * accel;
+		if (c.vx > maxVx) c.vx = maxVx;
+		if (c.vx < -maxVx) c.vx = -maxVx;
+	} else {
+		c.vx *= friction;
+		if (Math.abs(c.vx) < 0.5) c.vx = 0;
+	}
+	// Gravity
+	c.vy += g;
+	if (c.vy > maxVy) c.vy = maxVy;
+	// Platform collision
+	c.onGround = false;
+	var nextX = c.x + c.vx;
+	var nextY = c.y + c.vy;
+	for (var i = 0; i < platforms.length; ++i) {
+		var p = platforms[i];
+		// Only check collision if close
+		if (Math.abs(nextX - p.x) < 400 && Math.abs(nextY - p.y) < 200) {
+			// Simple AABB
+			var px = p.x,
+				py = p.y,
+				pw = p.width,
+				ph = p.height;
+			// Check vertical collision (falling onto platform)
+			if (c.x + c.width / 2 > px - pw / 2 && c.x - c.width / 2 < px + pw / 2) {
+				// From above
+				if (c.y + c.height / 2 <= py - ph / 2 && nextY + c.height / 2 >= py - ph / 2) {
+					// Land on platform
+					nextY = py - ph / 2 - c.height / 2;
+					c.vy = 0;
+					c.onGround = true;
+				}
+			}
+			// Horizontal collision (run into side)
+			if (c.y + c.height / 2 > py - ph / 2 && c.y - c.height / 2 < py + ph / 2) {
+				// From left
+				if (c.x - c.width / 2 <= px + pw / 2 && nextX - c.width / 2 >= px + pw / 2) {
+					nextX = px + pw / 2 + c.width / 2;
+					c.vx = 0;
+				}
+				// From right
+				if (c.x + c.width / 2 >= px - pw / 2 && nextX + c.width / 2 <= px - pw / 2) {
+					nextX = px - pw / 2 - c.width / 2;
+					c.vx = 0;
+				}
+			}
+		}
+	}
+	// Jump
+	if (jumpPressed && c.onGround) {
+		c.vy = jumpV;
+		c.onGround = false;
+		jumpPressed = false;
+	}
+	// Move character
+	c.x = nextX;
+	c.y = nextY;
+	// Prevent falling out of bounds
+	if (c.y > 2800) {
+		// Respawn
+		c.x = levelData.spawn.x;
+		c.y = levelData.spawn.y;
+		c.vx = 0;
+		c.vy = 0;
+	}
+	// Camera follow
+	var targetCamY = c.y - 1200;
+	if (targetCamY < 0) targetCamY = 0;
+	cameraY += (targetCamY - cameraY) * 0.15;
+	game.y = -cameraY;
+	// Sack collection
+	var key = 'L' + currentLevel;
+	for (var i = 0; i < sacks.length; ++i) {
+		var s = sacks[i];
+		if (!s.collected && rectsIntersect(c, s)) {
+			s.collect();
+			collectedSacks[key][s.sackId] = 1;
+			storage.collectedSacks = collectedSacks;
+			totalSacks++;
+			storage.totalSacks = totalSacks;
+			updateSackText();
+			// Unlock new skin every 10 sacks
+			var unlockCount = unlockedSkins.length;
+			if (totalSacks >= unlockCount * 10 && unlockCount < 15) {
+				unlockedSkins.push(unlockCount);
+				storage.unlockedSkins = unlockedSkins;
+				updateSkinText();
+				// Flash to show unlock
+				LK.effects.flashScreen(0x00ff00, 600);
+			}
+		}
+	}
+	// Portal check
+	if (rectsIntersect(c, portal)) {
+		// Next level
+		if (currentLevel < LEVELS.length) {
+			loadLevel(currentLevel + 1);
+		} else {
+			// Game complete
+			LK.showYouWin();
+		}
+	}
+};
+// --- Start Game ---
+loadLevel(currentLevel);
+// --- Touch: Hide skin select on up if open
+LK.gui.center.up = function (x, y, obj) {
+	if (skinSelectActive) hideSkinSelect();
+};
\ No newline at end of file