400 million credits:
Press R2, L2, R2, L1, R2, R1, R2, L1 at the main menu.
All tracks and jets:
Press R1, L1, R1, R2, L2, R2, L2, L1 at the main menu to unlock all tracks and
jets in arcade mode.
Bonus jets:
Press R1, R2, L1, L2, L2, L1, R2, R1 at the main menu to unlock more jets in N.
Gen mode. Alternately, successfully complete both circuits of any type in first
place to unlock a secret jet.
One of the bonus jets (the F-1x) has a left engine that is yellow instead of
purple like the others in the game.
Sites: