Killing Floor
2009 · Tripwire Interactive
Killing Floor is a cooperative first-person shooter video game developed and published by Tripwire Interactive. It was originally released as an Unreal Tournament 2004 mod in 2005. A full retail release followed on May 14, 2009, for Microsoft Windows, and for OS X on May 5, 2010. A version for Linux was released via Steam in November 2012. Synopsis from Wikipedia, CC BY-SA.
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Editions
The formats this game was pressed for. Years are the release for that platform where Wikidata records one — a blank year means the platform is documented but the date isn't.