Bonus options
Press A, C, A, C, A, B after ''PRESS START'' comes up. Goto the options screen to get the nwe options.
Race time
Press A, C, A, C, B after ''PRESS START'' comes up.
Invincibility
Put in the the ''Bonus Options'' code. Press START when choosing the mode and track. To select a car, press X Y Z and START.
Hidden cars
Put in the the ''Race time option'' code, and hold Start.