Hyper Street Fighter II: The Anniversary Edition (Arcade)

The last revision of Street Fighter II for the arcades (Revival and HD Remix don't count here, due to being ports of Super Turbo), Hyper Street Fighter II celebrated Street Fighter's (belated) 15th Anniversary...by reworking the second game of the series.

The arcade version was a rare product (specifically the US version, which was dumped by the MAME team a long time ago), but was later released for the PlayStation 2 and Xbox - in fact, the game was originally a PS2 release. (The Xbox version, as well as the PS2 version in America, were only available through Street Fighter Anniversary Collection, which also included Street Fighter III: Third Strike...but not the original Street Fighter).

Unused Music
Three leftover songs from Super Turbo (specifically, the character select and attract mode themes and even the aforementioned unused music) remain accessible in this game, accessible by selecting sound code, , and in the sound test. These were discarded in Hyper in favor of the Super versions of said themes for those instead.

CPS1 Leftovers
Inside the game's data, (aside from Characters' portraits and sound) there are several assets from the Character Select Screen, Attract Mode, and Endings from the earlier versions of Street Fighter II that lays there as a leftover while dumping assets during the development.

Regional Differences
In addition to the boss name changes and Akuma's ending, Hyper added a new regional difference: the play types "SuperT" (Super Turbo) and "Champ" (Champion Edition) are "SuperX" and "Dash" in the Japanese version.

The logo for the secret Super Turbo Old mode (accessible by selecting Super, then pressing Start + Jab Punch) is also different between versions, for obvious reasons: