SAS zombies insane asylum
This game takes place in an old abandoned asylum bringing you a various array of textures and environments, from plain rooms to toilets and kitchens. This is a fun birds eye zombie survival game. Throughout the waves you can earn money and purchase better guns, also unlock more doors so that the map is larger and not as crowded giving you more versatility while creating chains of zombies or just avoiding them. Also when you open doors you find more guns to unlock. This is a very popular game and can keep you entertained for quite some time.