Cheat mode

Enter "UTOPIA" as a password to unlock all 15 bonus missions, FMV sequences, music test, and art gallery.

Level select

Enter "PLINTH" as a password to unlock all 31 missions.

Infinite ammunition

Begin a new game, then hold L1 + L2 + R1 + R2 + Circle at the weapons screen. If you entered the code correctly, you will hear a sound.