Various cheats
     At the Options screen, press F1. Now enter the following codes:

Cheat code:             Effect:
GLASSX                  Crystal cup
ROCKYY                  Diamond cup
ZDPEAK                  Zenith cup
DESERT                  Scorpion car
RATTEL                  Cobra car
XPERTS                  All Cups and Mirror Mode
RUNNER                  Cheetah car
ALLVID                  All Cars and Cups
MYSTER                  Panther car