High Quality Content by WIKIPEDIA articles! Dota 2 is an upcoming multiplayer online battle arena video game being developed by Valve Corporation and the stand-alone sequel to the popular Defense of the Ancients mod for Warcraft III: Reign of Chaos and its expansion pack, The Frozen Throne. Formally announced on October 13, 2010, via Game Informer, the game is currently available for early test access purchase, with a free-to-play business model when released.Dota 2 will be released via download by Valve`s content delivery platform Steam, on which the game has been developed to run exclusively for both release and update delivery.Dota 2 will run on Microsoft Windows and Mac OS X.