GTA: Zombie Assault
The zombie apocalypse is here is there is nothing we can do about that except to continue fighting. Unless, you would want to become zombie yourself, it would be wise to keep a gun by your side all the time since there are zombies everywhere. But, that won't mean that they would avoid you if you got one. This is a survival game and you do not want any of those zombies getting close to you, for sure. Each kill would earn you money, which you can use to buy upgrades. You can use it to repair some barricades or for whatever it is you want to do in the game.