Track select
 
 Pause the game in single player mode. Then, enter the "Sound" option,
 highlight the "FX Volume" selection, and press L1 + L2.
 
 Faster engine
 
 Select multi-player mode. Then at the track selection screen, press X
 + Square + Triangle + Circle. If you entered the code correctly, an
 engine will be displayed at the bottom of the screen.
 
 Jumping cars
 
 Select multi-player mode and select a track and car. Then when the
 countdown that marks the start of the race begins, press Circle +
 Left. 
 
 Night racing
 
 At the track selection screen, hold L1 + L2 + R1 + R2 until
 headlights appear in front of the car. If you entered the code
 correctly, a new symbol will appear on the track.
 
 Upside down tracks
 
 At the track selection screen, press L1 + R1 + X + Down. If you
 entered the code correctly, an arrow will appear at the bottom of the
 screen. 
 
 Reversed tracks
 
 Choose a track and press Select. Then, quickly hold X + Square as the
 cars enter the tunnel. While continuing to hold those buttons, press
 Left or Right. If you entered the code correctly, the cars will turn
 around and enter the tunnel in reverse. Alternatively, press L2 + R2
 + X + Down at the track selection screen. If you entered the code
 correctly, an arrow will appear. 
 
  Game Shark Codez:
 
                     
  P1 Always Place First 
  801F76F8 0001
                     
  Night Racing Mode     
  800A6D0C 0001
                     
  Upside Down Tracks    
  800A6E28 0001