Review by Jason Dobry Killing Floor Developer Tripwire Interactive Publisher Tripwire Interactive Released May 14, 2009 Available for PC Verdict: 2/5 Rotten Egg “Tripwire Interactive recently released Killing Floor, an updated retail version of the 2005 mod by the same name for Unreal 2004. I managed to secure it for only 15 bucks on Steam, so it seemed like a low-risk venture. But can a four-year old mod stand up to the king of co-op …