Now onto the Single player mode or the «single player upgrade» if you've purchased the
multiplayer edition, this is basically the same as a private match in
multiplayer, you play one of the
multiplayer selections against AI on top of that you have
survival mode which was rather confusing, my idea of the game was a
normal FPS game with zombies implemented so you can't camp, when you're playing the
survival mode the full area has some sort of gas which will kill you if you don't get out of it, you get sent to different air pockets which open up in a set area per round, this meaning you have to camp in the air bubble and take on the hordes of zombies approaching, I've played a few zombie fps games in my days and always wanted to move around, create a train and take them out, on top of that ammo drops or weapon drops are in said bubbles and lack in quality, I wasn't impressed with the
survival mode implementation and wouldn't advise any horde fans to even look at it.