Greenman Gaming announces their own BioShock Infinite Steam pre-purchase unlocks besides those mentioned yesterday by stacking a couple of additional bonuses on top of the pile by offering their own alternate set of preorder bonuses for Irrational's shooter sequel. They are selling Steam keys, so but the original Steam don't bonuses apply (currently the original BioShock). Instead, GMG will add the original BioShock as well as your choice of the following games to your order: Spec Ops: The Line, Civilization V, BioShock 2, The Darkness 2, or Mafia 2. Thanks DEALZON. Update: Cleared up out initial misunderstanding that the GMG bonuses stack with the Steam bonuses, rather than replace them. Apologies for the error and any confusion.