Choose Same Character Twice in Group Mode
Go to group mode Where it has the 2 modes to choose from on Controller 2 press DownZUpXAYBC You should here Chun Li say her voice as if she was doing her whirlwind kick It can also be done by using controller 2 and pressing DownCUpAABBC
Five Star Mode in Champion mode
When the Capcom logo fades the building will show up with the Street Fighter II logo When the screen stops going up and you can see the logo on a 6 button controller press Down Z Up X A Y B C If right you should here a short Zangief sound It can also be done on a 3 button controller by pressing Down C Up A A B B C
Only Special Moves
Press DownZ UpX A Y BC Now you can only use special moves when fighting