When you enter one of the following codes correctly on the Title Screen, you will see a confirmation color flash.
Green – Unknown Effect
Up, Down, Left, Right, Down, Up, Right, Left, B
Blue – Shows the credits.
L, R, L, R, Select, Up, Down, Left, Right, B
Purple – Unlocks the bonus characters.
Up, Right, Down, Left, Up, Left, Down, Right, Select, B
Orange – Is the Easter Egg chat between the developers.
Up, Down, Up, Down, B, Left, Right, Left, Right, Select, L, R
Pink – Unknown Effect
Select, B, Left, Right, Select, B, Up, Down