All cars
Press [Triangle], [Square]x2, [X],
[R1] at the options screen. A sound will confirm correct
code entry.
Truck
Select any car, then hold [L1] until the race
begins.
Hidden car
Select any car, then hold [R1] + [R2] until
the race begins.
UFO
Hold [R1] + [R2] + [L1] + [L2]
at the car selection screen and choose a car. Keep those buttons
held and press [X] at the transmission selection screen.
Then, hold [Triangle] until the race begins.
Reversed tracks
Complete circuit mode to unlock an option for forward
and reversed tracks.
Stunt mode
Complete tournament mode to access a stunt mode option
on the Golden Gate track.