Home News Killing Floor Retail version of Tripwire's Killing Floor ships to US stores News by Stephany Nunneley-Jackson News Editor Published on Sept. 16, 2009 Follow Killing Floor Tripwire has announced that the retail version of Killing Floor has shipped to stores in the US. It includes the Heavy Metal Content Pack and two new playable characters. More free and paid content updates are expected for the game in the coming months. You can still get it digitally through Steam.