Killing Floor is a cooperative survival first-person shooter game powered by the Unreal Engine 2.5. Developed and published by Tripwire Interactive, Killing Floor was first released as a mod in 2005 for Unreal Tournament 2004. In its early stages, the mod became popular after appearing in game magazines. The Mod version of Killing Floor had its final official fifth update in July 2008.

The full retail version of Killing Floor was announced in March 2009 and released on the 14th of May, 2009 on Steam. Killing Floor uses a Heavily Modified version of Unreal Engine 2.5, which is originally a game engine developed by Epic Games.

Killing Floor is a cooperative survival horror first-person shooter based on Co-op Multiplayer. The game offers a Solo-Single player mode, and an online cooperative multiplayer.

Killing Floor wins Best PC Game of 2009, plus several other awards.

Tripwire Interactive is very pleased to announce that their survival cooperative first-person shooter has won the Best PC Game of 2009 in the Reader’s Choice Awards of Voodoo Extreme’s website.

There was a lot of argue at first, but the community has proven that Killing Floor is one hot title for the year 2009.

In addition to that, Killing Floor also won the Best First-Person shooter of 2009 and Best PC Game Expansion of 2009 at the Reader’s Choice of Voodoo Extreme.