Race against Hannya
Win the all three courses in championship mode. Then, Hannya will be selectable as an opponent in challenge mode.

Use Locked Cars
Enter two player mode and select one of the inaccessible garages. Now quit two player mode and start a one player race without selecitng another card at all. You will find that you are now using one of the locked cars!

Race with Hannya car
Defeat Hannya on all three courses. Then, Dues will be selectable as an opponent in challenge mode.

Race with Dues car and reversed tracks
Defeat Dues on all three courses. Then, the mirror version of all three tracks will be selectable.

Match race mode
Finish in first place on each difficulty level in championship mode.

Faster start
At the beginning of the race, during the countdown, wait until the timer reaches "1", and then hold Accelerate right away.

Cheats