On Controller 2 hold the 'Start' button and switch on the Playstation. Keep holding the 'Start' button until the Main menu appears and press L1, R1, R2, L1, Select, Start to enable cheat mode. Menu options for Campaigns 2 and 3 will now be enabled allowing you to enter the following codes during gameplay.
Unlock God Mode: Press Triangle on Controller 2 (this will also reveal ALL hidden objects).
Unlock Level Skip: Press Select on controller 2.
Unlock ALL Items: Press X on Controller 2.
Unlock Infinite Power: Press Circle on Controller 2.
Unlock Super Unit Strength: Press Up on Controller 2.
Unlock Weak Unit Strength: Press Right on Controller 2.
Current Research Completed: Press Down on Controller 2.
Unlock Additional Structures: Press R1 on Controller 2.
Unlock Additional Units: Press R2 on Controller 2.
To activate cheat mode, Hold down Start on the second controller while the game loads. Then press L1, R1, R2, L1, Select, Start at the main Sweet Tooth will appear at the vehicle selection screen - Leftx3, Rightx2 push the following during gameplay for the wanted cheat:
Skip level - press Select on second second controller God mode - press Triangle on second controller Infinite Power - Press Circle on second controller