Cheat List:

Enter codes at the Main Menu. 

Get Every Car: Hold L1 + R1 and press TRIANGLE, X, X, CIRCLE, X, CIRCLE, 
TRIANGLE, X 

All Tracks: Hold L1 + R1 and press SQUARE, SQUARE, SQUARE, X, TRIANGLE, 
TRIANGLE, SQUARE, X 

All track editor features:
Win all the Arcade Circuit and Slalom Series races in either first, second, or third 
place.