Select any track
Play in single palyer mode and pause the game. Then, go to the "Sound"
option, highlight the "FX Volume" option, and push L1 + L2.
Jumping cars
Choose the multi-player mode and choose a track and car. Then when the
countdown that marks the start of the race begins, push the
Circle + Left buttons.
Faster engine
Choose the multi-player mode, then go to the track selection screen and
push X + Square + Triangle + Circle buttons.
If the code is accepted, an engine should appear on the screen.
Night racing
Hold L1 + L2 + R1 + R2 at the track selection screen until headlights
appear in front of the car. If the code is accepted, a new symbol should
appear on the track.
Upside down tracks
Press L1 + R1 + X + Down at the track selection screen. If the code is
accepted, an arrow should appear on the track.
Reversed tracks
Press L2 + R2 + X + Down at the track selection screen. If the code is
accepted, an arrow should appear.
or
Choose a track and push the Select button. Then, quickly hold X + Square
as the cars enter the tunnel. Keep held X + Square and press Left or Right.
If the code is accepted, the cars will turn around and go into the tunnel
in reverse.