Infinite Ammo:
Start a new game, then hold L1 + L2 + R1 + R2 + Circle at the Weapons screen.
You'll hear a sound to confirm.
Bonus Stuff:
Enter UTOPIA as a password. You now get all bonus missions, music and artwork
in the Database screen.
Unlock All Missions:
Enter PLINTH as a password to unlock all 30 missions and credits
Thanks to Revolution reader Eria!
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