Master code
Press Up, Down, Left, Right while the game is loading and you can read your "mission". A message will appear in the bottom right corner to confirm correct code entry. All secret options will be unlocked. Alternately, press Up, Down, Left, Right, A.
Disable opponent AI
Press Left(2), Down, B while the game is loading and you can read your "mission". The message "Kill AI" will appear in the bottom right corner to confirm correct code entry. Alternately, press Left(2), A.
Opponents only attack you
Press Down, Up, Right, B while the game is loading and you can read your "mission". The message "Bot Gang Up" will appear in the bottom right corner to confirm correct code entry. Alternately, press Down, Up, A.
Unlimited nitros
Press Right, Left, Down, B while the game is loading and you can read your "mission". The message "Infinite Nitros" will appear in the bottom right corner to confirm correct code entry. Alternately, press Right, Left, A.
No nitros
Press Right, Left(2), A while the game is loading and you can read your "mission".
Jumping car
Press Left, Right, Up, B while the game is loading and you can read your "mission". The message "Jumps" will appear in the bottom right corner to confirm correct code entry. Press Y during game play to jump. Alternately, press Y, Left, Right, A.