Killing Floor is a Co-op Survival FPS taking place in the devastated cities and countryside of England, after a series of cloning experiments for the military goes horribly wrong. You and your friends are members of the military and police, dropped into these locations with a simple mission: survive long enough to cleanse the area of the failed experiments.The only problem is, these \"experiments\" aren\'t waiting to be taken out - they´re coming for YOU!Features:Cooperative gameplay for up to six players against multiple waves of specimensPersistent Perks system, allowing players to convert their in-game achievements into permanent improvements to their character\'s skills and abilitiesSlow-motion “ZEDtime” to better watch those crucial and violent creature deaths, even in multiplayerSolo game mode for offline playNine different monster types trying to eat your face off, armed with everything from teeth and claws, to chainsaws, chain-guns and rocket-launchers12+ weapons for the players to chose from, ranging from knives and fire-axes to pump shotguns, rifles and a flamethrowerEquip your team with welders, medical tools and body armor to help your odds of survivalOpen, non-linear play areas: choose when and where to fight — or run; weld doors closed to direct the monster horde down alternate corridorsFully-configurable, allowing players to change the difficulty level, number of creature waves, or even set up their own favorite waves of monstersSupport for Steam Friends and other Steamworks featuresIncludes SDK for the creation of new levels and mods