Cheats for Demolition Racer: No Exit (DC)

All game modes
At the "Press Start" screen, press X, R, Y, R, L, R(3) 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(4), X, Y to unlock all cars.