Free video game until around 10 AM Pacific Time on Saturday, June 25th as part a promotion for the FPS sale in the Humble Store:
Killing Floor, a co-op horror survival first person shooter game which is 1st in the eponymous series (
Wikipedia), available worldwide @
Humble Bundle (compatible with Windows, Mac, & Linux via Steam key; requires Steam account linked to your HB one, and must redeem the key in the Steam app by July 1st)
Killing Floor is a Co-op Survival Horror FPS set in the devastated cities and countryside of England after a series of cloning experiments for the military goes horribly wrong. You and your friends are members of the military dropped into these locations with a simple mission: Survive long enough to cleanse the area of the failed experiments!