SD Cars:
When the main menu appears, hold X and press Right(2), Up(2), Down, Left, Down, Left, Right, Up,
Down, Left, Right, Up, Right.

Transparent Car:
When the main menu appears, hold Start and press Up(2), Right, Left, Down, Down, Left, Up, Right(2),
Up, Down, Left(2), Down.

Long Tracks:
When the main menu appears, hold X + Select and press Right, Down, Left, Up, Right, Down, Left, Up,
Down, Right, Up, Left, Down, Right, Up.

Wide Turns:
When the main menu appears, hold Circle and press Down(2), Left, Down(3), Left, Down, Up, Down,
Right, Left, Right, Left, Up.

Monochrome Graphics:
When the main menu appears, hold Select and press Right(4), Up(4), Down, Right, Up, Down, Right, Up,
Left.

Decrease Gravity:
When the main menu appears, hold Circle + Start and press Right, Up, Down, Left, Right, Up, Down,
Left, Right, Up, Down, Left, Right, Up, Left.

Bonus Tracks:

Finish in first place on all levels in "STC" mode to unlock the HKS-VEC, ING-CAL and AUT-318 tracks.
Finish in first place on all levels in "SSS" mode to unlock the TCY-TMR, KGS-ERS tracks.

Extra Cars:
Complete one of the following goals to unlock the corresponding bonus cars:
Finish in first place in the end of year championship race in each of the three levels under "NC"
mode to unlock nine bonus cars (three per level).
Finish in second or third place in the end of year championship race in each of the three levels
under "NC" mode to unlock six bonus cars (two per level).
Finish in fourth, fifth, or sixth place in the end of year championship race in each of the three
levels under "NC" mode to unlock three bonus cars (one per level).
Finish in first place overall in each of the three levels under "TC" mode to unlock nine bonus cars
(three per level).
Finish in second or third place overall in each of the three levels under "TC" mode to unlock six
bonus cars (two per level).
Finish in fourth, fifth, or sixth place overall in each of the three levels under "TC" mode to
unlock three bonus cars (one per level).