Sent in by Link at The Unofficial World of Nintendo!!!
Type in the password below for $30,000:
Top row- blank,triangle,square in square,blank
Second row- X,square in square,blank,circle in circle
Third row- blank,square in square,blank,X
Last row- square in square,diamond,diamond,V
At the main menu, press Up, X, Left, Y, Down, B, Right, A,
Up, X on Controller 2. Now start the game in either Main Race
or Battle Mode; when you reach the menu where you choose the
difficulty setting, you'll find the new option.