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THQ today announced that the co-op mode for Warhammer 40,000: Space Marine, Exterminatus is available on Playstation 3 and PC to download for free. Space Marines Exterminatus mode pits an elite squad of four Space Marines against hordes of alien enemies in a score based fight to the death. Players can choose the Tactical Marine, Devastator or Assault Marine as well as utilizing any weapons and perks available to those classes.