From Main Menu, choose single or multiplayer mode, then choose your type of race. When you get to Name Entry Screen, type in any of these names for:

COMPACT:tiny boats
DEFORM:huge heads
LARGE:big engines
SPEEEED:faster boats

From the main menu, go to the password option and enter these codes for:

CUP:championship mode
L.R:slalom course
U.G:mines level
PLA:hidden monohull boats
CUD:barracuda level catamarans