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Enter the password: /6Kb /xMi irLM +/22

Finish in first place in all the races in all four championship classes.

To access Formula 1 mode, play through the championship mode and beat all four of the classes with a first place in each race. You get a new car (Formula 1 racecar) after the last race. At the menu screen, the extra 2 option will be available.

Hold the L and R buttons. Then, push right on the D-pad and B simultaneously. You will hear a chime if you entered the code correctly. Go to the main menu, and you will see that you have unlocked the Extra 1 mode.

Select championship mode and win the beginner, middle, and high speed classes. An "Extra" option will now be unlocked at the main menu. Select it to race in mini-cars.