The definitive version. This game has everything you might want from a Street Fighter II game.
Despite the age, this is the Street Fighter II that remains relevant to this day, still being played casually and in tournaments.

The Street Fighter game that added Supers, thus changing fighting games forever (AoF did it first but it wasn't popular).
Akuma/Gouki was added as a secret new character. Also, added an option to choose older versions of every character.

New moves, new colors, balance changes. The Street Fighter II GOAT.