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Street Fighter IV (Vanilla, arcade version with base cast)
Street Fighter IV (Vanilla version for home consoles that added Dan, Fei, Sakura, Cammy, Gen, Rose. Also of note is that Seth and Gouken, while characters in the previous version, only become playable in this version forward.)
Super Street Fighter IV (Update that added Dudley, Makoto, Guy, Ibuki, Adon, Dee Jay, T Hawk, Juri, Hakan. Also had major balances changes. Came only as a standalone disc, but price was lower than standard retail games.)
Super Street Fighter IV: Arcade Edition (Decided to port the "Super" version to arcades in Japan, they also added Yun, Yang, Evil Ryu, and Oni in this version. Major balance changes were also added into this version. Eventually this version was ported to consoles as DLC/Standalone disk with no changes.)
Super Street Fighter IV: Arcade Edtion ver. 2012 (Major balances changes, unquestionably the most balanced version of the game. Came in the form of a free patch for consoles.)
Ultra Street Fighter IV (Balances changes from fan request, Elena, Hugo, Poison, Rolento, and one unconfirmed character that has never been in a SF game before. [Probably Haggar] Comes in the form of DLC/Standalone disc)