Warhammer 40,000: Space Marine for 48 hours is free to grab from Humble Store to celebrate the launch of the Summer Sale. This promotion is available from Thursday, August 30 at 10 a.m. Pacific time to Saturday, September 1 at 10 a.m. Pacific time.

In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles. A millions-strong Ork horde has invaded an Imperial Forge World, one of the planet-sized factories where the war machines for humanity’s never ending battle for survival are created. Losing this planet is not an option and be aware of the far more evil threat lurking large in the shadows of this world.

Just head over to Humble Store and add the game to your cart and checkout. Simple as that. Make sure to redeem your key in Steam soon, since they will get invalid shortly after the promo ends.