Fast car:
Pause game play and press Up, Down, A, B, Left, Right, C, Start.

Expert mode:
Pause game play and press Left, Right, Left, Right, Up, Down, Start, Down. For even more of a challenge, pause game play and press Left, Down, Up, Down, Right, Down, A, Down.

Increased traction:
Pause game play and press A, Up, B, Down, C, Left, Start, Right.

Unlimited lives:
Pause game play and press B, Down, C, Down, Up, Down, Left, Right.

Bad collisions:
Pause game play and press C, Up, Left, Right, A, B, A, C.