Cheat Codes:
Pause the game to enter these codes -
Any Object               Down, Down, Up, Up, Right, Right, Left, Left.
Behind Car View    Left, Right, Square, Circle, Left, Right, Square, Circle.
Big Bounces           Square, Right, Right, Down, Up, Down, Left, Down, Down.
Double Speed         Square, X, Circle, Square, Triangle, X, X, X, X.
Floating Objects     Square, Triangle, Square, Square, Triangle, Square, Square, Triangle, X.
Slow CPU Cars       Circle, Triangle, Square, X, Circle, Triangle, Square, X.

Debug Mode:
Pause the game & press Square, Up, Down, Down, Square, Circle, Circle, Triangle, X to enable Debug mode. To use it, press any of the button sequences below while your playing -
Quit Race & Win                         Press Select + X. This doesn't work in time trials.
Change Camera Angle            Hold Select & press Up, Down, Left (or Right).
Change Camera Zoom            Hold Select & press L2 or R2.
Turn Player Into CPU Drone  Hold Select & press Square.
Blow Up All Cars                        Hold X + Triangle + Circle + Square.

Extra Codes:
Enter these codes on the Name Entry screen -
3LIVES          ?
CONFETTI    ?
CATLIVES    9 lives in 1-player mode.
GIMMEALL   All tracks in multi-player mode.
NOTANKS    Tanks can't shoot.
TANKS4ME  Tanks can be used on all tracks but those with water.
WINTERY      Slippery roads.