Mercedes-Benz World Racing - Platform: XBox

Single player cars 
Enter "ALLUCANGET" as a user name to unlock almost all the cars and 
tracks in single player mode. This will also get you about 80 percent 
through the game.

Multi-player cars 
Enter "FULL HOUSE" as a user name to unlock almost of the cars and 
tracks in multi-player mode.

Control view 
While racing in single player mode, press L + R + Back + White. 
Use the D-pad or Right Analog-stick to control the view. 
Press White again to drop your car.