Killing Floor is exactly what it sounds like. Okay, no, it's not a game about a floor that eats everything it touches. We call that game hot lava, and it's much less gruesome than this one. No, Killing Floor is a first person shooter where you kill everything on the same floor as you that looks like it might be a zombie. Sure, it may actually be the result of a failed cloning experiment, but if it looks like a zombie and sounds like a zombie, shoot it.

Killing Floor: Calamity is a twin-stick version made for mobile devices. It's still a co-op experience like the Steam version that gamers fawned over back in 2009.

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