No Damage
Go to the Options menu, and select Options: Cheat Codes. Then enter the phrase "gladiator" to activate the no damage cheat.

Unlock All Cities
To unlock all cities, enter the code "Globetrotter."

Unlock All Modes
To unlock all modes, go to the cheat menu and enter the phrase "dextran".

Unlock All Vehicles
To unlock all vehicles, go to the cheat menu and enter the phrase "theCollector".

Unlock All Vehicles and Cities
To unlock all vehicles and cities, go to the cheat menu and enter the phrase "pennyThug".

Unlock Everything in Arcade Mode
Go to the Options menu, and select Options: Cheat Codes. Then, to unlock all cars, areas, etc. in Arcade Mode, enter the phrase "rimbuk".

Have Infinite Nitros
To have infinite Nitros, go to the Options menu, and select Options: Cheat Codes. Then enter the phrase "greenLantern" to activate the cheat. (It's case-sensitive, so make the L big).

Better Air Control
To have better control over the car in the air, enter the code "carcrobatics".

Change Difficulty
To outfit machine guns and rockets to your car, go to the Options menu, and select Options: Cheat Codes. Enter the code howhardcanitbe, followed by a number 0-9. The most difficult is howhardcanitbe9, while the easiest is howhardcanitbe0. Enjoy.

Machine Guns and Rockets
To outfit machine guns and rockets to your car, go to the Options menu, and select Options: Cheat Codes. Enter savethekids as a cheat to hook your ride up with machine guns and rockets. When playing the game press R3 (click the right analog stick) to fire rockets and L3 (click the left analog stick) to fire machine guns.

Unlock LAPD Car
To unlock the LAPD car, beat all circuit races in LA.

Unlock Parisian Police Car
Beat all circuit races in Paris (Arcade Mode) to unlock the Parisian police car.

Unlock Tokyo Police Car
To unlock the Tokyo Police Car, beat all circuit races (Arcade Mode) in Tokyo