Level select:
     At the main menu, press L1, L1, Circle, Circle, Square, Square.

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Third person mode codes:

Invincibility:
     Pause the game and press Triangle, Triangle, Circle, Circle, L1,
L2.

All weapons:
     Pause the game and press Square, Square, Circle, Circle, L1, L1.

Infinite ammunition and grenades:
     Pause the game and press L1, L1, R1, R1, Circle, Circle.

First person view:
     Pause the game and press Circle, Triangle, Triangle, Square.

Dampen camera:
     Pause  the  game  and press Triangle, Triangle, Triangle, Square,
Square, Square.

Disable laser sight:
     Pause the game and press L1, L1, Triangle, Triangle, L1, L1, L1.

Slow rockets:
     Pause the game and press L1, R1, R1, L1, Triangle, Square.

Big head mode:
     Pause the game and press R1, R1, L1, L1, Triangle, Triangle.

Electronic mode:
     Pause the game and press Square, Square, L1, L1, R1, R1.

Skeleton mode:
     Pause  the  game  and  press  Circle, Square, Triangle, Triangle,
Square, Circle.

Head pop off:
     Pause the game and press Square, Square, Circle, Circle, R1, R1.

Funk mode:
     Pause the game and press Circle, Circle, Square, Square, L1, L1.

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Shooting mode codes:

Invincibility:
     Pause the game and press Triangle, Triangle, Circle, Circle, L1,
L2.

All weapons:
     Pause the game and press Square, Square, Circle, Circle, L1, L1.

Infinite ammunition:
     Pause the game and press L1, L1, R1, R1, Circle, Circle.

Slow rockets:
Pause the game and press L1, R1, R1, L1, Triangle, Square. 

Auto-reload:
     Pause  the  game  and  press  Square, Square, Triangle, Triangle,
Circle, Circle.

Slow-mo mode:
     Pause the game and press Triangle, L1, Triangle, L1, Triangle, L1

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Driving mode codes:

Invincibility:
     Pause the game and press Triangle, Triangle, Circle, Circle, L1,
L2.

Infinite nitro:
     Pause the game and press L1, L1, R1, R1, Circle, Circle.

Infinite time:
     Pause the game and press L1, R1, Square, Square, R1, L1.

Rainy weather:
     Pause the game and press Square, Square, L1, L1, Triangle,
Circle.

No body:
     Pause the game and press L1, R1, R1, L1, L1, R1.

Snake car:
     Pause the game and press Circle, Square, R1, R1, Circle, L1,
Circle.