Remove meters
 
 Pause the game and press L1 + L2 + R1 + R2 to remove the G-force
 meter. Repeat this code to remove all the meters. Repeat this code
 once more to restore the display to normal.
 
 Remove cars
 
 Pause the game and press Right(3), Left(3) to remove all cars from
 the display. Repeat this code to restore the display to normal.
 
 Bonus options
 
 Complete the following goals in each level to unlock the
 corresponding bonuses: 
 
 Scenario 1
 
 Get into the top three at the beginning to unlock the Supottore-Su
 car (single player), Calsonic Primeraitc car (two player), R390GT1
 car (time attack), and the Asia and Italy races.
 
 Scenario 3
 
 Get into top three in scenario 2 at the end to unlock five new cars
 in single player, two player, and time attack modes, and the Pacific
 and Japan races. 
 
 Scenario 4
 
 Get first place in scenario 3 to unlock five new cars in single
 player, two player, and time attack modes.
 
 Scenario 5
 
 Set the number of laps to 20 in scenario 4. Then finish in third at
 the end to unlock eight cars.
 
 Scenario 6
 
 Set the number of laps to 20 in scenario 5. Then finish in first at
 the end to unlock the GTP-ZxTurbo car and all the cars in scenarios 1
 through 5. 
 
 Scenario 7
 
 Set the number of laps to "Full". Then finish in first at the end to
 unlock an extra difficulty level.