When you play Tunnel Rush, you will get the impression that you are really within the tunnels since it is a three-dimensional game. Moreover, the tunnels are transforming from being black and white to a swirling pattern of rainbow colors, and this is happening in a sequential fashion. It is tough to concentrate as a consequence of these shifts; hence, you need to focus more on avoiding the red obstacles that are approaching and less on the winding caves where you are now located.