Bonus levels
During a level, collect all six stars to get a doll. After you collect 8 and 16 dolls you'll unlock bonus levels...
Boss battle
Beat the fairground levels to unlock a new area that allows you to battle previously defeated Bosses.
Music test
Beat either bonus level to unlock songs in the music box option.
Picture gallery
Beat the fairground levels to unlock a picture gallery.
Unlock Mometsuto
Beat the game to have Mometsuto as a playable character