All Cheats, Cobra Car, Diamond Cup, and More

At the Game Select screen, highlight Options and press u. At the Options Settings menu, enter the following passwords to activate these cheats:

Activate All Cheats: ALLVID
Activate the Scorpion Car: DESERT
Activate the Cobra Car: RATTLE
Activate the Cheetah Car: RUNNER
Activate the Panther Car: MYSTER
Open the Crystal Cup in Grand Prix Mode: GLASSX
Open the Diamond Cup in Grand Prix Mode: ROCKYY
Open the Zenith Cup in Grand Prix Mode: ZDSPEAK
Open Challenge Mode: MASTER