2 Hidden Characters:
     Beat the game with any characters and Megaman and Little Red Lady
will be unlocked. You can't see them on the character selection screen
but they are on left and right of the other characters.

Hidden Mode:
     Beat the game once and you will unlock Gallery Art. This contains
pictures  of  characters  and  the  game. Beat teh game with the other
characters to unlock more pictures.

Recieve Cammy w/ new outfit:
     When  at  the  player selection screen, first you must highlight,
then press up. Her outfit has now changed to a lighter color.