Heroes of the Storm (originally titled Blizzard DOTA and later changed to Blizzard All-Stars) is a multiplayer online battle arena video game developed by Blizzard Entertainment for Microsoft Windows and OS X. The game features heroes from Blizzard's franchises including Warcraft, Diablo, StarCraft, The Lost Vikings and Overwatch. The game uses both free-to-play and freemium models and is supported by micropayments, which can be used to purchase heroes, visual alterations for the heroes in the game and mounts.Blizzard does not call the game a "multiplayer online battle arena" or an "action real-time strategy" because they feel it is something different with a broader playstyle; they refer to it as an online "hero brawler".The game entered closed beta on January 13, 2015, and the full version of the game was released on June 2, 2015.