===================================================================
--- original.js
+++ change.js
@@ -1,5 +1,10 @@
 /**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
 * Classes
 ****/ 
 var Grid = Container.expand(function () {
 	var self = Container.call(this);
@@ -8,20 +13,25 @@
 	self.cellSize = 160;
 	self.spacing = 10;
 	self.gridWidth = self.cellSize * self.cols + self.spacing * (self.cols - 1);
 	self.gridHeight = self.cellSize * self.rows + self.spacing * (self.rows - 1);
+	self.memes = [];
 	self.createGrid = function () {
 		for (var row = 0; row < self.rows; row++) {
+			self.memes[row] = [];
 			for (var col = 0; col < self.cols; col++) {
 				var cell = self.attachAsset('cuadricula', {
 					anchorX: 0,
 					anchorY: 0
 				});
 				cell.x = col * (self.cellSize + self.spacing);
 				cell.y = row * (self.cellSize + self.spacing);
 				var meme = new Meme();
+				meme.row = row;
+				meme.col = col;
 				meme.x = cell.x + self.cellSize / 2;
 				meme.y = cell.y + self.cellSize / 2;
+				self.memes[row][col] = meme;
 				self.addChild(meme);
 			}
 		}
 	};
@@ -30,25 +40,82 @@
 });
 var Meme = Container.expand(function () {
 	var self = Container.call(this);
 	self.value = Math.floor(Math.random() * 5) + 1;
-	var memeGraphic = self.attachAsset('meme' + self.value, {
+	self.row = 0;
+	self.col = 0;
+	self.memeGraphic = self.attachAsset('meme' + self.value, {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
+	self.swap = function (otherMeme) {
+		// Store original positions
+		var myX = self.x;
+		var myY = self.y;
+		var otherX = otherMeme.x;
+		var otherY = otherMeme.y;
+		// Animate the swap
+		tween(self, {
+			x: otherX,
+			y: otherY
+		}, {
+			duration: 300,
+			easing: tween.easeInOut
+		});
+		tween(otherMeme, {
+			x: myX,
+			y: myY
+		}, {
+			duration: 300,
+			easing: tween.easeInOut
+		});
+		// Swap grid positions
+		var tempRow = self.row;
+		var tempCol = self.col;
+		self.row = otherMeme.row;
+		self.col = otherMeme.col;
+		otherMeme.row = tempRow;
+		otherMeme.col = tempCol;
+	};
+	self.down = function (x, y, obj) {
+		game.selectedMeme = self;
+	};
+	self.up = function (x, y, obj) {
+		if (!game.selectedMeme) {
+			return;
+		}
+		// If this is a different meme than the selected one
+		if (game.selectedMeme !== self) {
+			// Check if this meme is adjacent to the selected one
+			if (self.isAdjacent(game.selectedMeme)) {
+				self.swap(game.selectedMeme);
+			}
+		}
+		game.selectedMeme = null;
+	};
+	self.isAdjacent = function (otherMeme) {
+		// Check if the other meme is laterally or above adjacent
+		var rowDiff = Math.abs(self.row - otherMeme.row);
+		var colDiff = Math.abs(self.col - otherMeme.col);
+		// Adjacent horizontally or vertically (but not diagonally)
+		return rowDiff === 1 && colDiff === 0 || rowDiff === 0 && colDiff === 1;
+	};
 	return self;
 });
 
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0xF4FFFF
 });
 
 /**** 
 * Game Code
 ****/ 
 var grid = new Grid();
 grid.x = (2048 - grid.gridWidth) / 2;
 grid.y = (2732 - grid.gridHeight) / 2;
-game.addChild(grid);
\ No newline at end of file
+game.addChild(grid);
+game.selectedMeme = null;
+;
+;
\ No newline at end of file