Enter the following at the password screen.

Effect	Password
Activate All Cheats	ALLVID
Activate Challenge Mode	XPERTS
Activate Cystal Cup	GLASSX
Activate Diamond Cup	ROCKYY
Activate The Pather Car	MYSTER
Activate Zenith Cup	ZDPEAK
All Cars Cheat	ALLVID
Unlock Panther Car	MYSTER
Unlock Scorpion Car	DESERT
Unlock the Cheetah Car	RUNNER
Unlock the Cobra Car	RATTLE