Level Passwords:
1. The Prison - Square, Circle, Triangle, X, Circle, Square.
2. Morph Base - Triangle, Circle, X, Circle, Square, X.
3. Mars Mining Facility - X, Circle, X, Circle, Triangle, X.
4. Venus Space Station - X, Square, Triangle, Circle, Circle, Triangle.
5. Pyramid - Square, Square, Triangle, X, X, Triangle.
6. Landing Pad - Triangle, X, X, X, X, Circle.
7. Underground (Flying) - Circle, Circle, Triangle, X, Triangle, X.
8. Morph Mother Ship - Square, Square, X, Triangle, Square, Square.
9. Earth Base: Command Room - Triangle, X, X, Triangle, Circle, Triangle.
10. Earth Base: Dormitory - X, Triangle, Square, Circle, Triangle, X.
11. Reactor Room - Circle, Square, X, X, Square, X.
12. The Master Brain - Square, Triangle, X, Square, Circle, X.
13. The Escape (Flying) - X, X, Circle, Triangle, Circle, Triangle.

Cheats:
To enable the following cheats, you must first press Square, Triangle, Circle, X, Circle, Triangle at the password screen. Ignore the invalid code message & enter the following -

View FMV Sequences:
Press Square, X, Circle, Triangle, Circle X.

Level Select:
Press Circle, Circle, Triangle, X, Square, Square. Ignore the invalid code message & start a new game. Pause & then Select Resume with Circle.

Unlimited Shield:
Press Square, Circle, Circle, Square, Triangle, X. Ignore the invalid code message & start a new game.

Invincibility:
Press Triangle, X, Triangle, Triangle, Square, Circle. Ignore the invalid code message & start a new game. You cannot die within the game, some weird results may occur if overused.