Out of Eight writes: We love killing zombies. From taking them on first hand to having plants do it for us (that's simply laziness), we can't get enough of ridding the world of the undead. The new fad of cooperative multiplayer gaming has latched on to this and produced notable titles such as Left 4 Dead, a game that was not reviewed on this particular site because Valve ignored my requests for a review copy. Jerks! Killing Floor started out as a modification for the excellent Unreal Tournament 2004, but now the developers of the Red Orchestra mod for the same parent game (and its subsequent retail release) have acquired a different mod and gone retail again, hoping to cash in on the monster-killing-loving that is pervasive on the PC right now."