Totaled! Codes -

Master code:
Push , , , while the game is loading and you can read your MISSION. A message in the bottom right corner if you entered the code correctly. This code unlocks all secret options. Or push , , , , .

Disable opponent AI:
Push , , , while the game is loading and you can read your MISSION. You will see the message KILL AI in the bottom right corner if you entered the code correctly. Or push , , .

Opponents only attack you:
Push , , , while the game is loading and you can read your MISSION. You will see the message BOT GANG UP in the bottom right corner if you entered the code correctly. Or push , , .

Unlimited nitros:
Push , , , while the game is loading and you can read your MISSION. You will see the message INFINITE NITROS in the bottom right corner if you entered the code correctly. Or push , , .

No nitros:
Push , , , while the game is loading and you can read your MISSION.

Jumping car:
Push , , , while the game is loading and you can read your MISSION. You will see the message JUMPS in the bottom right corner if you entered the code correctly. Push during game play to jump. Or push , , , .

Kill computers:
Push (x2), while the game is loading and you can read your MISSION. You will see the message KILL COMPUTERS if you have entered the code correctly (might need to enter multiple times to see message).