Bonus options:
Press A, C, A, C, A, B after "Press Start" appears on the title screen. The copyright statement will turn yellow to confirm correct code entry. Enter the options screen to access the "Sunday" and "Monster" classes.

Race time option:
Press A, C, A, C, B after "Press Start" appears on the title screen. The copyright statement will turn yellow to confirm correct code entry. Enter the options screen to access the "Race Time" option.

Hidden cars:
Enable the "Race time option" code. Then, hold Start to begin a race to select one of the three hidden cars.

Invincibility:
Enable the "Bonus options" code. Then, press Start when selecting the play mode and track. Then, press X + Y + Z + Start to select a car.