Never being satisfied, we knew we could expand upon the action-packed cooperative experience in a way that took our gunplay, gore, and destruction to new heights with Killing Floor 2. We expand our games with new weapons, maps, and features as free content to keep the community thriving and excited about what’s to come. Here at Tripwire, the story of the game never ends at release. Killing Floor was ahead of its time with co-op horde shooter mechanics, and four years later we at Tripwire worked with that original mod team to bring it to fruition as a full game, charting a lasting legacy for the team ever since. The story of Killing Floor starts 14 years ago with an Unreal Tournament 2004 mod.