2 cheats
I have 2 cheats for you!
1: this can with any character: if you're racing, hold ''R'' by a turn. if the turn is left, push your yoystick for a second to the right. do this two times, and you got a short turbo! this works also by a right turn.
2. if you play VS with 2-4 players, AND you got a long way head to the other players, stop your kart in the final lap close by the finish, spin around 180 degrees, go backward and you hear 2 finishes for you. you see then 2 points in one race!
Booster
To get a boost at the start of the race and an early lead, do not hold the acceleration button before the race. Wait until after the last light flashes, then punch the gas. If you time it just right, you should get a boost that puts you into first place!