Unlock Codes Enabled Mode:
At the 'Options' menu set the laps to 6 and the difficulty to 'Professional and press Circle, Circle, Circle, Square, Triangle, Triangle, Square, Triangle at the 'Main' screen.

Unlock ALL Tracks:
At the 'Options' screen set the difficulty to 'Amateur' and the trophy presenter to 'Male' and press Up, Right, Down, Left, Up, Right, Down, Left. Then at the 'Main' screen press Left, X and return to the 'Options' screen and set the difficulty to 'Professional' and the trophy presenter to 'Rider's Choice'. Go back to the 'Main' screen and press Up, Left, Down, Right, Up, Left, Down, Right. If the code has been entered correctly you will hear the sound of coins and 'Master' difficulty level will also be enabled.