SD Cars
     At  the  Main  Menu, hold X and press Right, Right, Up, Up, Down,
Left, Down, Left, Right, Up, Down, Left, Right, Up, Right.

Transparent Car
     At the Main Menu, hold Start and press Up, Up, Right, Left, Down,
Down, Left, Up, Right, Right, Up, Down, Left, Left, Down.

Big Tracks
     At  the  Main  Menu, hold X + Select and press Right, Down, Left,
Up, Right, Down, Left, Up, Down, Right, Up, Left, Down, Right, Up.

Wider Turns
     At  the  Main Menu, hold Circle and press Down, Down, Left, Down,
Down, Left, Down, Up, Down, Right, Left, Right, Left, Up.

Monchrome Graphics
     At  the Main Menu, hold Select and press Right(4x), Up(4x), Down,
Right, Up, Down, Right, Up, Left.

Decrease Gravity
     At  the Main Menu, hold Circle + Start and press Right, Up, Down,
Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Left.