Versions

Super Street Fighter II Turbo
Super Street Fighter II Turbo (Super Street Fighter II X: Grand Master Challenge in Japan) was a slightly updated version of Super Street Fighter II. This version introduced:

* The addition of the "SUPER" bar. This allowed character to build up and unleash a very powerful special attack.
* The speed was again raised from Super SF2, close to Hyper Fighting levels.
* Intentional air juggling (a series of attacks that could hit an opponent while airborne)
* The ability to tech or "soften" non-multi hit throws (teching allows a character to land on one's feet instead of on their back, resulting in less damage).
* A new secret character (Akuma).
* Alternate versions of each character that played very similar (but not quite identical) to their Super Street Fighter II version.
* The bonus stages (where players try to destroy all the objects in the stage before time runs out) were removed.
Hyper Street Fighter II: The Anniversary Edition
Hyper Street Fighter II was a slightly arranged version of Super Street Fighter II Turbo with the ability to choose every previously playable version of all the characters within the SFII series. This game commemorates the 15th Anniversary of the Street Fighter series.
Super Street Fighter II Turbo HD Remix
Super Street Fighter II Turbo HD Remix is an upcoming title on the PlayStation Store and Xbox Live Arcade download services. It is an enhanced remake of Super Street Fighter II Turbo. Sprite and background images posted on the Capcom Digital blog provided an early glimpse at the project, while the first in-game footage was recorded on producer Rey Jimenez's cellphone. Super Street Fighter II Turbo HD Remix will feature two gameplay modes: classic and rebalanced. Other features will include:
* Online and offline multiplayer
* A training mode
* Voice chat
* A 'Quarter Match' mode which allows players to spectate and jump into online matches
* Worldwide rankings and leaderboards arranged by character and country
* Indepth statistics tracking
* A display mode that fits the game into a 16:9 aspect ratio without impacting gameplayThe sprites and backgrounds in the original Super Street Fighter II Turbo will be replaced by high-resolution artwork drawn by UDON Comics, allowing HD Remix to make the most use of high definition displays. Remixed music is also in development.