Defense Grid 2 - Special Edition - Mac [Online Game Code] Sequel to the definitive tower defense game, Defense Grid - The Awakening 21 levels, all new worlds, and new threats Single player mode, multiplayer cooperative mode, and multiplayer player-versus-player mode The ability to create your own levels using the DG Architect tools Special Edition includes "The Art of Defense Grid 2" digital book, ebook "The Making of Defense Grid 2:, and "A Matter of Endurance" audiobook