[quote name='benjamouth']I remember back in the SFII (original version) SNES days there were a lot of myths about making the 4 bosses playable, I think you could get M Bison somehow, but not the other three.[/quote]
There's no way to play as the bosses in SFII for SNES unless you used a Game Genie code. As should be expected, the code was glitchy and, IIRC, wouldn't last past one match.