/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Define the grid size
var gridSize = 25;
// Create a 2D array to represent the grid
var grid = new Array(gridSize);
for (var i = 0; i < gridSize; i++) {
	grid[i] = new Array(gridSize);
}
// Calculate the size of each cell in the grid
var cellWidth = 2048 / gridSize;
var cellHeight = 2048 / gridSize;
// Populate the grid with cells
for (var x = 0; x < gridSize; x++) {
	for (var y = 0; y < gridSize; y++) {
		var tile;
		if (x == 0 || y == 0 || x == gridSize - 1 || y == gridSize - 1) {
			tile = LK.getAsset('wallTile', {
				anchorX: 0.0,
				anchorY: 0.0,
				scaleX: cellWidth / 100,
				scaleY: cellHeight / 100,
				x: x * cellWidth,
				y: y * cellHeight
			});
		} else {
			tile = LK.getAsset('floorTile', {
				anchorX: 0.0,
				anchorY: 0.0,
				scaleX: cellWidth / 100,
				scaleY: cellHeight / 100,
				x: x * cellWidth,
				y: y * cellHeight
			});
		}
		game.addChild(tile);
		grid[x][y] = tile;
	}
}
var selectedTile;
// Handle touch events on the game stage
game.on('down', function (obj) {
	// Get the position of the touch event
	var pos = obj.event.getLocalPosition(game);
	// Calculate the grid coordinates of the touch event
	var gridX = Math.floor(pos.x / cellWidth);
	var gridY = Math.floor(pos.y / cellHeight);
	// Clear the tint of the previously selected tile
	if (selectedTile) {
		selectedTile.tint = 0xFFFFFF;
	}
	// Highlight the tile under the touch event
	var tile = grid[gridX][gridY];
	tile.tint = 0x00ff00;
	// Save the selected tile
	selectedTile = tile;
});

===================================================================
--- original.js
+++ change.js
@@ -44,15 +44,22 @@
 		game.addChild(tile);
 		grid[x][y] = tile;
 	}
 }
+var selectedTile;
 // Handle touch events on the game stage
 game.on('down', function (obj) {
 	// Get the position of the touch event
 	var pos = obj.event.getLocalPosition(game);
 	// Calculate the grid coordinates of the touch event
 	var gridX = Math.floor(pos.x / cellWidth);
 	var gridY = Math.floor(pos.y / cellHeight);
+	// Clear the tint of the previously selected tile
+	if (selectedTile) {
+		selectedTile.tint = 0xFFFFFF;
+	}
 	// Highlight the tile under the touch event
 	var tile = grid[gridX][gridY];
 	tile.tint = 0x00ff00;
+	// Save the selected tile
+	selectedTile = tile;
 });
\ No newline at end of file