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Playstation - Test Drive: Off-Road 2 cheats

Unlock all tracks and cars:
Hold Select and push L1, Left, L2, Right, L2, Left, L1, L1 
at the main menu.

Unlock Black widow truck
Choose World Tour or Single Race mode. Hold Select and press 
R1, L2, L2, Down, Down, Up, L2, L1 at the transmission selection screen. 

Unlock Ice cream truck
Choose World Tour or Single Race mode. Hold Select and press 
R2, L2, L2, Down, Down, L2, L2, R1 at the transmission selection screen.

Unlock School bus
Choose World Tour or Single Race mode. Hold Select and press 
L1, Up, L2, Down, Down, L2, L2, R2 at the transmission selection screen. 

View developers pictures:
Race on the reversed Mojave track. After the start, turn around and drive 
to the opposite direction. Go to the right of the sand dune. Keep driving 
in that direction until you reach the Accolade sign with the developers 
pictures.