Pause the game, highlight the quit option, then hold R2 while entering following codes.
Press Left, Triangle, Right, Down. The cars will increase in size.
Fergus mode with invincibility
Press Circle, Down, Down, Triangle, X, Square.
Press Right, Square, Left, Triangle, X, Square, Down. In addition to the car floating, buildings appear damaged and run down.
Flat shaded mode
Press Down, Up, Left(2), Down, Up, Left(2), Down, Up, Left(2).
Press Left, Up, Left(2), Square, Down.
Sky cam view
Press Circle, Right, Down, Square, Triangle, Left. The turbo button now is a launch button.
Press Down, Circle, Down, Circle.
Very slow motion
Press Circle, Down(2), Square, Right.
Press Circle(2), Square(2), Down(2), X(2).
Press Left, Circle, Up, Down, Square, Right.
Fuzzy car dice
Press Right, Circle, Left(2), Square, Down. The interior view will display two model cars or two fuzzy dice hanging from the top.
Press Down, Square, Triangle, Right.
Flying saucer mode
Press Right, Square, Triangle, Down, X(3).
Press Right, Up, Down, Square on controller one. Various debug information will appear on the screen. Press Start on controller two. Press Triangle on controller two to toggle the clock on or off. Press Left or Right to move between levels. Press Square on the controller two to restart the level. Press Circle on controller two to move to the next bomb. Repeat the first part of the code to remove the debug information from the screen.