Scott from The Controller Online writes: "As Warhammer 40,000: Space Marine’s launch neared, I remember thinking it was weird that this game didn’t have any co-op. Well, Relic Games though so to. In fact, it appears they thought co-op should have been included in the original release. Exterminatus will be completely free, no strings attached. Is it the co-op we were looking for? Not exactly, but it will do for now."