At the title screen, press B, Up, B, B, A.
At the title screen, press B, Left, Up, B.
At the title screen, press B, A, Left, Left.
At the title screen, press Right, Up, B, B.
At the title screen, press C, C, C, Up, Down, C.
At the title screen, press C, A, B, C, Up, Down.