At the corresponding ''Mission Select'' screens, key in the following codes:
Code Effect Up, L1, Down, R1, Left, L1, Right, R1, Up Unlock all co-op Campaign Missions Up, L1, Down, R1, Left, L1, Right, R1, Up Unlock all Single Player Campaign Missions
In game codes
At the in-game options screen.
Code Effect Left, Right, Up, Down, Up, Down, R2, L2 Infinite Ammo Up, Down, Left, Right, Left, Right, L2, R2 Invulnerable
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You can submit a problem report for any non-working or fake code in the lists above.