Super Mario Kart (SNES)

Super Mario Kart cheats:

Hard Mode
To access the Hard Mode, highlight your kart and Press Y + A and your highlighted kart will shrink to Tiny Mode, continue and Highlights the cup of your choice and you will ride very tiny until the current cup ends! WARNING: this will be very difficult! even when your Tiny until the current cup ends, you will ride the same speed as a Normal Kart. to reverse this effect, just Press Y + A again in the Kart Choose Menu. Have fun!

Mini Racers
Select Mario Kart GP Mode. Then at the Character Selection screen, hold Y and press A. Or, highlight a character and press A + B + X + Y.

Reset All Saved Data
At the Title screen, press L + R + Y + A.

Reset Race Times
At the chosen time trial, press L + R + Y + A.

Special Cup Tracks
Select Time Trial Mode, choose a racer and press Left to highlight the Mushroom Cup. Now press L, R, L, L, R, R, A.

Turbo Start
As the last light starts to dim, hold B.

Other Sites you may consider
CheatServer.Com
Cheat Codes Club