Basically it's an open world military game with zombies. It features permadeath so anything you've gathered; food, weapons, gear all stays on the body or in the backpack of that dead character. So when you restart all you get is 1 bandage, 1 painkiller, 1 flashlight, and I think a watch. People will also lure you or kill you for your stuff and all the servers are also on real time meaning if it's 8am in real life it's 8am in the game and progresses at the same rate.