Stage and level skip:
Pause game play and press C, Right, A, B(2), A, Left(2), A, Right,
Down. Resume game play. Pause game play again and press Up to jump to the next stage or Right to jump to the next level.

Extra life:
Hold Start and press Down, Up, Left(2), A, Right, Down during game play.

Full time and energy:
Hold Start and press Right, A, Down, A, Right, B, Left, Up, Right during game play.

Extra time and energy:
Hold Start and press B, A, Right(2), A, C, Up, Down, A during game play.

Brighter pause screen:
Hold Start and press Down, Up, Left(2) during game play