Enter two player mode, and select one of the inaccessible garages. Then, quit two player mode, and start a one player race without selecting another car to use one of the previously locked cars.

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

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

Defeat Dues on all three courses. Then, the mirror version of all three tracks will be selectable.

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

At the title screen, press R to display the time trial score for the Mountain course.

At the beginning of the race, hold Accelerate when the timer reaches "1".

Race past the windmills and uphill zig-zags to approach the ¾ mark. Then, locate the wide turn that is near a waterfall. Look for a tree next to a "One Way" sign near the right edge of the track. Drive towards the tree to find a gap in the fence that leads to a dirt road. Follow the road to pass through the waterfall, into a watery tunnel that will bring your car close to the finish line.