While holding L and R buttons, select Grand Prix mode, class, driver, and cup. You will play on the bottom screen on Controller 2 instead of the top screen on Controller 1.
You can shrink your driver and kart by holding button Y and pressing A at the Driver Select screen of Grand Prix and Match Race modes.
When selecting a cup in Grand Prix mode, press L, R, L, R, L, L, R, R to reveal the Special Cup. If playing Time Trial or Match Race, highlight the Kinoko Cup and press L, R, L, R, L, L, R, R, A to unlock the Special Cup there. Or you can win the Gold Cup in the Kinoko, Flower, and Star cups on 100cc to access the Special Cup permanently.
Earn the Gold Cup in the Kinoko, Flower, Star, and Special cup of the 100cc to unlock 150cc difficulty.
In the Time Trial Driver Select screen, press Start on controller 2. Now you can select any character to race against as a ghost on any course.
Re-released on the Wii's Virtual Console in Japan on june.9, 2009, nov.23, 2009 in North America, and apr.2, 2010 in Europe.