A free program for Android, by Torque Gamers.

Zombie world war attack: Extreme gun strike is a first-person shooter survival game where you have to kill zombies to save the world from a global pandemic. This top-down shooting game is where the dead are rising and a new virus is spreading. You are a survivor hero and your mission is to save the world from a pandemic of zombies. You will be able to unlock new weapons and upgrades as you progress through the game. You can even play as a zombie hunter and kill other undead in a shooting war.  There are several missions and maps to play on.