Goemons Great Adventure Cheats for Nintendo 64
Unlock Four-Player Mode:
Have controllers in ALL four slots and then play the game with one or two players. Find 44 hands from various levels and then on the 3rd and 4th controllers hold 'C-Right + Start'.
Unlock Alternate Costumes:
Enable four player mode as above. Then go to the 'Prediction House' to be able to change costumes.