Demolition Racer: No Exit

All game modes 
At the "Press Start" screen, press 
X, R, Y, R, L, R, R, R 
to unlock all game modes.

All extras 
At the Press Start-screen, press 
L, R, X, L, X, R, X, Y 
to unlock all game extras.

All cars 
At the "Press Start" screen, press 
X, Y, R, R, R, R, X, Y 
to unlock all cars.