Yes — co-op. Warhammer 40,000: Space Marine - Anniversary Edition is a sci-fi shooter game released in 2011, 92% positive on Steam (30,416 reviews), with 95 playing right now. $39.99 on Steam.
In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles.
Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.
Steam tags: Warhammer 40K, Action, Third-Person Shooter, Sci-fi, Third Person, Multiplayer, Gore, Singleplayer
Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Warhammer 40,000: Space Marine - Anniversary Edition is one of them — then helps you pick tonight's game with a weighted roll or a bracket.
Or open the Steam store page.
Tired of Warhammer 40,000: Space Marine - Anniversary Edition? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.
Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; page updated 2026-09-23. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. Ready Up is a Somebody Decide program. How the data works · Legal & privacy · All types · Game Pass