Dungeons & Dragons Online: Eberron Unlimited (abbreviated as "DDO") is a massively multiplayer online role-playing game (MMORPG) developed by Turbine, Inc. for the Microsoft Windows operating system, and originally marketed as Dungeons & Dragons Online: Stormreach. Turbine developed DDO as an online adaptation of Dungeons & Dragons (D&D) based loosely on the D&D 3.5 Rule-set. It is set in the Eberron campaign setting. Internet access is required to play.