title: Change tile color on tap
body: <p>Alright, so let's say I have a tile map that looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/0Bysu.png" alt="enter image description here"></p>
  
  <p>When the user touches the blue part on the right (I handle the coordinates and all that) how can I make the blue part turn into a different color (a different set of tiles, let's say green tiles I have created some green tiles)?</p>