Every ships, weapon, and all upgrades:
Press L1, R1, L2, R2, Up, Down, Right, Left, Left, Right, Down, Up at the start screen.
Level select:
Press L1, R1, L2, R2, Triangle, X, Circle, Square, Square, Circle, X, Triangle at the start screen. To activate the cheat, just go back to 'start mission' screen.
More tricks, tips and cheats for this game are right here - B-Movie cheats
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