Go to the menu, choose OPTION + CHEAT and enter the following
 codes:

 GIMMEALL    ALL LEVELS AND CARS ACTIVE
 RESETALL    RESET TO GAME DEFAULTS
 RESETLAP    RECORD LAPS AND TIMES RESET
 KEYFOUND    FOUND ALL PADLOCK KEYS
 RESETFMV    ALL FILMS RESET
 CINEMAON    ALL FILMS AVAILABLE
 RESETKEY    ALL KEYS RESET
 KARTSON     GAME WITH KARTS
 KARTSOFF    GAME NO KARTS