Extra ships:
At the title/start screen, press Up, Left, down, Right, Up, Triangle, Up, Right, 
Down, Left up circle.If you hear an explosion then it worked. At the character 
select screen go far left or right there will be 5 more ships to chose from.

Win first place in the first round and at the beginning of the next race 
pause the race and enter L,R,CIRCLE,U,D,X+U.