Tripwire Interactive has announced that Killing Floor has sold over 1 million copies on PC. To celebrate, the developer is offering the game at 85 percent off during the Steam “Midweek Madness” sale at http://store.steampowered.com/app/1250/.
Significant stats for the Killing Floor include 1.1 million copies sold on in 2 and a half years , with nearly 2 million Killing Floor DLC packs sold also sold. 45 million hours of Killing Floor have been played to date, and 440 million Zeds have been dispatched in Achievements alone (including more than a quarter-million Christmas Santas) at the rate of over 20,000 an hour. The community has contributed hundreds of custom maps.
