During gameplay enter the following codes to activate the corresponding.

Restore Health:
Square, Circle, Square, Circle, Square, Circle, Square, Circle.

Unlock Weapons:
Triangle, X, X, Triangle, Square, Circle, Circle, Square, X, Square, Circle, Triangle.

Unlock Infinate Ammo:
Triangle, Square, Square, Circle, Triangle, Square, Square, Circle.

Money Cheat:
Triangle,Circle,Triangle, Circle, Square, X, Square, X, Down, Up.

Tornado:
Triangle, Circle, X, , Square, Square, X, Circle, Triangle.

Decrease RIOT level:
Triangle, Circle, X, Square, Triangle, Circle, X, Square, Down.

Increase RIOT level:
Triangle,Circle, X, Square, Triangle, Circle, X, Square, Up.

All Vehicles:
During game-play pause the game and highlight the 'Map' option. Then press the following combination:
Up, Down, Up, Down, Triangle, X, Triangle, X, Square, Circle(2), Square.
A sound of an engine will confirm correct code entry.

Restore Health:
During game-play pause the game and highlight the 'Map' option. Then press the following combination:
Square, Circle, Square, Circle, Square, Circle, Square, Circle.
A sound of an engine will confirm correct code entry.

Infinite Ammunition:
During game-play pause the game and highlight the 'Map' option. Then press the following combination:
Triangle, Square(2), Circle, Triangle, Square(2), Circle.
A sound of an engine will confirm correct code entry.

During gameplay, pause your game and highlight the map option. Next enter the following combo:

Triangle, X(2), Triangle, Square, Circle(2), Square, X, Square, Circle, Triangle.