Hold Square at the 'Options' screen and then press Up, Circle, Down, Circle, Left, Right, Left, Right, Circle. You'll know if you've entered the code correctly because a new window called 'Secret' will appear at the bottom of the 'Options' screen. Now go to Single-Player mode and enter 'NORTHEND' (case sensitive and without the quotes) as a name and ALL courses and cars (ice-cream van and cow-catcher (UFO) included) will be unlocked.
At the main menu press Up,Cirlce,Down,Cirle,Left,right,left,
right,circle then go to player one to enter name Northend you will then hear the announcer say Wild Wild racing then go back to options and at the of the options page will be a place where you can unlock all cars and track and engines