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Killing Floor is a Co-op Survival Horror FPS set 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 dropped into these locations with a simple mission: Survive long enough to cleanse the area of the failed experiments!
* Cooperative gameplay for up to six players against multiple waves of specimens
* Persistent Perks system, allowing players to convert their in-game achievements into permanent improvements to their character's skills and abilities
* Over 40 Steam Achievements, including “Dignity for the dead†for killing 10 enemies feeding on dead teammates' corpses and “Hot Cross Fun†for finishing off 25 burning enemies with a Crossbow
* Slow-motion “ZEDtime†to better watch those crucial and violent creature deaths, even in multiplayer
* Solo game mode for offline play
* Nine different monster types trying to eat your face off, armed with everything from teeth and claws, to chainsaws, chain-guns and rocket-launchers
* 12+ weapons for the players to chose from, ranging from knives and fire-axes to pump shotguns, rifles and a flamethrower
* Equip your team with welders, medical tools and body armor to help your odds of survival
* Choose which Perks to play with to best balance out your co-op team against the horrors
* Open, non-linear play areas: choose when and where to fight  or run; weld doors closed to direct the monster horde down alternate corridors
* Fully-configurable, allowing players to change the difficulty level, number of creature waves, or even set up their own favorite waves of monsters
* Support for Steam Friends and other Steamworks features
* Includes SDK for the creation of new levels and mods
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System Requirements
Minimum:
o OS: Windows 2000/XP/Vista
o Processor: 1.2 GHZ or Equivalent
o Memory: 512 MB RAM
o Graphics: 64 MB DX9 Compliant
o Hard Drive: 2 GB free hard drive space
o Sound: DX 8.1 Compatible Audio
Recommended:
o OS: Windows 2000/XP/Vista
o Processor: 2.4 GHZ or Equivalent
o Memory: 1 GB RAM
o Graphics: 128 MB DX9 Compliant with PS 2.0 support
o Hard Drive: 2 GB free hard drive space
o Sound: Eax Compatible
(http://i174.photobucket.com/albums/w102/odsthelljumper1989/0000008434800x600.jpg)