Level Select:
At the options screen, highlight password & hold Select, press Triangle, L1, Square, release Select & press Triangle, L1, Square, Triangle, L1, Square. You can select any level of your choice.

Continues & More:
Pause the game. At the options/continue screen, select options, then press Triangle, Square, Circle, Square, Triangle, Square, L1, L1 + R1. Unpause & a skull should appear. Press Triangle, Square, L1, L1, L1, Square, Triangle. You may enter this code as often as you wish for more continues, plans & plasma shots.

Level Codes:
Magna Prime:
X, Circle, Triangle, Square, X, X, X, Square.

Soloris Centuria:
Triangle, Triangle, Circle, X, Triangle, Triangle, X, Square.

Polaris 5:
Circle, Circle, Circle, Triangle, X, Triangle, Square, Square.

Sun Dagger:
Square, X, Circle, Triangle, X, Square, Triangle, Triangle.