Level skip:
Pause game play and press A, B, Right, A, C, A, Down, A, B, Right, A.

Invincibility:
Pause game play and press A, B, Right, A, C, A, Down, A, B, Right, Left. Note: collecting a shield will disable this code.

Full energy:
Pause game play and press A, B, Right, A, C, A, Down, A, Right, B, A. Resume game play for full energy.

Full health:
Pause game play and press A, B, Right, A, C, A, Down, A, B, Left, A.

Fireballs:
Pause game play and press A, B, Right, A, C, A, Down, A, B, Right. Resume game play and press A to throw fireballs.

Free movement:
Pause game play and press C, A, Left(2), A, C, A, B. A sound will confirm correct code entry. Resume game play and hold A + B + C to move freely in the game while invincible.

In-game reset:
Pause game play, hold A + B + C, and press Start.

Programmer messages:
Pause game play and enter one of the following controller actions to display the corresponding screen.

Screen 1
Press A, B, Right, A, C, A, Down + A, Start.

Screen 2
Press A, B, Right, A, C, A, Down + C.

Screen 3
Press A, B, Right, A, C, A, Down + A, A(2).