GTA: Zombo Buster
No one was expecting a zombie apocalypse, so most people died and turned into zombies when the zombie outbreak begun. Now a few survivors are able to live safe because of a highly developed city. This city has its zombie units to fight for the city. Most of the time, they are sent to other city to rescue some survivors. You control troops and you need to get rid of the zombies living in buildings. You need to clear them out. You would get paid base on the zombies you killed and you can use the money to upgrade your troops on the field.