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]x2, [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]x2,
[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]x2, [A] while
the game is loading and you can read your "mission".
Kill computers
Press [Left]x2, [A] while the game is loading
and you can read your "mission". The message "Kill
computers" will appear in the bottom right corner to confirm
correct code entry. Note: This may need to be repeated until the
message appears.
Other codes
When the game is loading and you can read your "mission"
randomly press buttons (Left Analog-stick, [L], [R],
[A], [B], [X], [Y], [White], [Black])
and you just may unlock a cheat message at the bottom left corner
of the screen. Some examples include Kill All (All bot cars are
disabled), Bot Gang Up (Bot cars always pile up), Monster Tires
(self-explanatory), and Tiny Cars (RC cars).