In extra celebration, all gamers who don't own it can try it out for free from tomorrow by pre-loading Killing Floor right now. This weekend will also be running a 25 percent off sale on Steam.
"Play the full game for FREE including the All-New "Level Up" Content Pack that contains 3 Maps, 7 Weapons, 20+ Steam Achievements and More! Must have Steam installed," Steam.
It's a free game to play over the weekend with all-new content for it, what's wrong with that? Killing Floor is a co-op survival horror shooter, much like Left 4 Dead is really, except it's set in England and we Brits accidentally screwed up our cloning research... our bad.
We'veon Tripwire's co-op horror spree.