Enter the following codes while the game is loading and you can read your mission:

Master code:
Up, Down, Left, Right, A.

Disable AI:
Left, Left, Down, B.

Opponents only attack you:
Down, Up, Right.

Infinite nitros:
Right, Left, Down, B.

No nitros:
Right, Left, Left, A.

Unlimited turbos:
Right, Right, A.

Jumping car:
Left, Right, Up, B. During play, press Y to jump.

Thanks to Revolution readers Shadow and arham!