GTA: Across Zombieland
Zombies has conquered the world and it is not safe to roam around the world anymore. Zombies will surely run after you to feed on your flesh. However, exploring would be possible if you have converted your vehicle into a zombie -proof vehicle. Drive as fast as you can till you reach the finish line. At least, that is the main idea, but that isn't easy at all as aside from the zombies, there are lots of mountain, cliff, and other things blocking your way. You need to overcome all of these to finish the level. The game gets harder and harder as you make some progress.