Enter the following initials upon achieving a high score. Then, after a game over or win, at the title screen, hold [Left], , and  (or [Left], [a], and [b] on the Classic Controller), and press [-] to activate the associated cheat.
.AS - Stage Select.
.HU - +4 Credits.
.SD - All - Stage Select, +4 Credits, and Simplified Special Moves.
.LK - Simplified Special Moves: [Forward]+[-] for Fireball, [Down-Forward]+[-] for Dragon Punch, [Back]+[-] for Hurricane Kick.