Alternate costumes:
Highlight Cammy and press Up or Down
at the character selection screen.
Bonus levels:
Choose difficulty four or higher and Finish the game without losing any lives. Another set of levels
with a higher difficulty will be unlocked.
Gallery Art option:
After finishing the game under any difficulty as various characters you will unlock the entries in the gallery
option.
Mega Man and B.B Hood:
Finish the game as any character under
any difficulty. Press Left or Right at the
character selection screen until Mega Man and B.B Hood appear.