Rating issues
The game features frequent gory violence. The majority of violence in the game is against zombies, whom you can shoot the heads and limbs off of. Zombies may remain staggering around headlessly or crawling along the floor for a while, before they finally die. When this happens, they splash into a sinewy liquid made up of blood, organs and bones.
Other issues
The game features online playing capability which may involve real-time interaction with other players.