Cheat Codes
Enter the following codes during the Difficulty Select screen to get the desired results:

Starship Level Complete:
Left, Left, Right, Circle Circle, Right, Right, Left.

Alaska Level Complete:
R1, Circle, R1, Square, Left, Left, Right, Left.

Deep Amazon Level Complete:
Left, Right, Left, Left, Right, R1, R2, Circle.

Earth Level Complete:
R2, R1, L1, L2, Square, Circle, Square, Circle.

Mid Atlantic Level Complete:
Circle, Square, Circle, Square, Right, Left, Left, Right.