/**
  * Triggers all tiles with the specified ID
  *
  * @param id The tile ID to trigger
  * @param pressed True when the button is down
  */
 public void trigger(int id, boolean pressed) {
   for (int y = 0; y < h; y++) {
     for (int x = 0; x < w; x++) {
       Tile b = tiles[x + y * w];
       if (b.id == id) {
         b.trigger(pressed);
       }
     }
   }
 }