At the title screen press quickly X,Y,B,A,Up,Left,Down,Right,R,L on controller 2, then start a game.
Ending (JP Version only)
On controller two at the title screen, press Up Up Down Down Left Right Left Right L R
Level Select (JP Version)
During your last continue, press Start on controller two.
Multiple Continues
On the Option screen, choose Hard Mode, then select ''STAFF'' in the sound test. Push B to hear the tune, then tap Y.
Secret Song
On controller 2, press: Up, Up, Down, Down, Left, Right, Left, Right, B, then A
Set number of lives in Options Menu