With the Christmas holiday closing in, Tripwire Interactive are offering Killing Floor free to play to everyone for a long weekend, starting on Thursday 8 December 2011 and running through to Sunday 11 December. This will give everyone who has not yet played the game a chance to try it out completely free! And there is a little surprise lurking as well... check out the Mystery Images on the Killing Floor Official Game Group on Steam for clues: http://steamcommunity.com/games/KillingFloor

Killing Floor is available now on Steam (http://store.steampowered.com/app/1250/), Direct 2 Drive and other digital outlets, as well as in stores across the world.

About Tripwire Interactive
Based in Roswell, Georgia, Tripwire Interactive is an entertainment software developer and publisher founded in 2005 by the award-winning mod team and winners of the 2004 edition of the "$1,000,000 Make Something Unreal" competition. Released in early 2006, Tripwire Interactive's debut retail title Red Orchestra: Ostfront 41-45 achieved both critical and commercial success garnering several awards including "Multiplayer Game of the Year" and "FPS of the Year" for 2006. Killing Floor, Tripwire's second title, jumped straight to the top of the Steam best-seller list and instantly became one of the top-ten most played FPS games in the world. Red Orchestra 2, released in September 2011, to high praise from the major critics, will continue our tradition of strong, long-term support for our games.

With some of the most-played PC multiplayer games on the market and over 2 million units sold on PC, Tripwire Interactive have proven that with hard work, determination, and great distribution partners, independent game developers can still make a big splash in the games industry. And if that wasn’t enough, Tripwire has now published Zeno Clash, The Ball, and Dwarfs, bringing more independent developers’ products to the world. For more information visit Tripwire Interactive's website at www.tripwireinteractive.com.