Killing Floor is a cooperative, survival-horror shooter developed and published by Tripwire Interactive. It runs on the heavily modified Unreal Engine 2.5, and is only playable on PC and Mac.
It was released May 2009, and was one of the highest-selling games on Steam shortly after its release. It is currently available on Steam's Summer Deal for $7.50. This amazing deal comes complete with all the additional content (DLC) offered, including all the character costume packs for significantly reduced prices.
The basis of this game's appeal is in its simplicity. You can't help but enjoy it, despite its miniscule redundancies and obvious imperfections. Players find a server, team up, and commence through ten waves of increasingly difficult fights, culminating in a fight with the top specimen, the 'Patriarch'.
On the surface, Killing Floor appears to have much in common with Nazi-Zombies from the Call of Duty series. The 'zombies' (specimens) can sniff you out - wherever you hide, and it's up to you and your teammates to formulate a survivable strategy.
Players earn money by defeating zombies and surviving waves. Between each wave, a trader offers some assistance in the form of flamethrowers, shotguns, shields, grenades, and an assortment of automatic rifles. Players are able to 'trade' their money for more advanced and practical weaponry, in order to even the odds. Players can also trade equipment, in order to keep the teams' weaker links goal oriented and ready to assist.
Killing Floor has won several awards since its release. Voodoo Extreme's Reader Choice Awards nominated the game 'Overall Best PC Game of 2009', 'Best PC Shooter of 2009', and 'Best PC Game Expansion of 2009'.
Steam's Summer Sale will not be going on much longer, so I urge game fanatics to take advantage of their exceptional deals. With some games discounted as much as 80%, Steam is truly setting high standards for competition. While consoles are breaking the bank and picking the pockets of their devoted customers, the Steam powerhouse is providing more fun at considerably less expense.