Enter the following codes to unlock the corresponding effect.
Unlock ALL Missions:
Hold Select + Square + Circle and rpess Right, Right, Right, Up, Left, Down, R2 at the 'Mission' select screen.
Hold Circle + Square and press R1, R2, L2, L1, Up, Down, Left, Right, Select at the 'Mission' select screen.
Unlock ALL Items in Inventory:
Press Square, Square, Square, Circle, Square, Circle, Circle, Left, Up, Down, Right, R2, R2 at the 'Inventory' screen.
Unlock Level Select:
Go to the 'Load/Save' menu at the 'Map' screen and hold R1 and quickly press Up, Down, Square, Up, Down, Square, Up, Down, Square, Down, Up, X.
During gameplay pause the game and hold square, then press Left, Right, Up, Down.