At the mode selection screen, press Down, Left, Up, Right, X, Y, L, R
Fourth colour set
R, X (7x), Y (7x) (on Mode Select screen)
Random Weather in Time Attack
At the mode selection screen, press Left(2), Right(2), Left, Right, X, Y(8). Alternately, successfully complete expert mode on the championship diffic
Super expert mode
Left, Right, Down, X, X, X, X (on Mode Select screen)
Unlock Combat Jet
Y, X, Right, Left, Right, Left, Down, Down, Up, Up (on Mode Select screen)
Unlock LE-2001 Vehicle