For a game called Killing Floor, the monsters sure do come out of every which surface. Can Achievement Hunter survive the zombie horde? The AH boys try their darnedest to weld up their safety doors to keep the baddies out. They cry for help, but nobody can save them now. 30%. 20%. Only a few more hits will bust the doors open. No escape. Time to ready your gun. Oh, you sold it between rounds and didn't buy a new one? That's no good.