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!
Only keys listed as "Region Free" can be redeemed in any country.
EU Keys can only be redeemed within the EU.
US Keys can only be redeemed within the USA.