While Warhammer 40,000: Space Marine 2 is easily one of the most content-rich single-player games in a long time, it also doubles as an incredible co-op adventure. From the legendary campaign to the replayable Operations missions, all of Space Marine 2 can be played with a friend. While solo players will still be able to appreciate the struggles and triumphs of Titus’ journey, co-op players will be able to embrace the camaraderie that the game excels at portraying.