===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,162 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var CalendarDoor = Container.expand(function (doorNumber) {
+	var self = Container.call(this);
+	self.doorNumber = doorNumber;
+	self.isOpen = false;
+	// Create door frame
+	var frame = self.attachAsset('doorFrame', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Create door
+	var door = self.attachAsset('door', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Create door number text
+	var numberText = new Text2(doorNumber.toString(), {
+		size: 60,
+		fill: 0xFFFFFF
+	});
+	numberText.anchor.set(0.5, 0.5);
+	self.addChild(numberText);
+	// Create hidden character
+	var characterTypes = ['character1', 'character2', 'character3', 'character4', 'character5', 'pango'];
+	var characterType = characterTypes[doorNumber % characterTypes.length];
+	var character = self.attachAsset(characterType, {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	character.alpha = 0;
+	character.visible = false;
+	self.openDoor = function () {
+		if (self.isOpen) return;
+		self.isOpen = true;
+		// Play door open sound
+		LK.getSound('doorOpen').play();
+		// Animate door opening
+		tween(door, {
+			scaleX: 0,
+			alpha: 0
+		}, {
+			duration: 300,
+			easing: tween.easeOut,
+			onFinish: function onFinish() {
+				door.visible = false;
+				numberText.visible = false;
+				// Show character
+				character.visible = true;
+				character.alpha = 0;
+				character.scaleX = 0.1;
+				character.scaleY = 0.1;
+				// Play reveal sound
+				LK.getSound('reveal').play();
+				// Animate character reveal
+				tween(character, {
+					alpha: 1,
+					scaleX: 1,
+					scaleY: 1
+				}, {
+					duration: 400,
+					easing: tween.bounceOut
+				});
+			}
+		});
+	};
+	self.down = function (x, y, obj) {
+		if (!self.isOpen) {
+			self.openDoor();
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
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+	backgroundColor: 0x0f3460
+});
+
+/**** 
+* Game Code
+****/ 
+// Create festive background
+var background = game.attachAsset('calendarBackground', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 1024,
+	y: 1366
+});
+// Create title
+var titleText = new Text2("Pango's Advent Calendar", {
+	size: 80,
+	fill: 0xFFFFFF
+});
+titleText.anchor.set(0.5, 0);
+titleText.x = 1024;
+titleText.y = 150;
+game.addChild(titleText);
+// Create calendar doors array
+var doors = [];
+// Create 31 doors in a grid layout
+var doorsPerRow = 6;
+var doorSpacing = 220;
+var startX = 200;
+var startY = 400;
+for (var i = 1; i <= 31; i++) {
+	var door = new CalendarDoor(i);
+	var row = Math.floor((i - 1) / doorsPerRow);
+	var col = (i - 1) % doorsPerRow;
+	door.x = startX + col * doorSpacing;
+	door.y = startY + row * doorSpacing;
+	doors.push(door);
+	game.addChild(door);
+}
+// Create Pango character in corner
+var pangoCharacter = game.attachAsset('pango', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 1800,
+	y: 300
+});
+// Add some floating animation to Pango
+var pangoFloatUp = true;
+var pangoBaseY = 300;
+game.update = function () {
+	// Animate Pango floating
+	if (LK.ticks % 60 === 0) {
+		if (pangoFloatUp) {
+			tween(pangoCharacter, {
+				y: pangoBaseY - 20
+			}, {
+				duration: 1000,
+				easing: tween.easeInOut
+			});
+		} else {
+			tween(pangoCharacter, {
+				y: pangoBaseY + 20
+			}, {
+				duration: 1000,
+				easing: tween.easeInOut
+			});
+		}
+		pangoFloatUp = !pangoFloatUp;
+	}
+};
+// Create instruction text
+var instructionText = new Text2("Tap doors 1-31 to discover surprises!", {
+	size: 45,
+	fill: 0xFFFF99
+});
+instructionText.anchor.set(0.5, 0);
+instructionText.x = 1024;
+instructionText.y = 250;
+game.addChild(instructionText);
\ No newline at end of file