All cars, tracks and modes:
Enter PEROPAVO as a name.

All cars:
Enter MACHOMAN as a name.

All tracks:
Enter MORATA as a name.

All arcade mode bonuses:
Enter THEMASTER as a name.

All game modes:
Enter PACMAN as a name.

Challenge mode:
Enter CUAQUEZ as a name.

Trophy mode:
Enter MADDUCK as a name.

Championship in professional mode:
Enter OOOH SI as a name.