Goemon's Great Adventure Cheats (Nintendo 64)

Enable four player mode. Then you can access new costumes for each character at the
"Prediction" house.

To get to the hidden town in the game, first beat the last boss. Then, go to Mokeke forest
in the Underworld. Find the Impact rock, then keep going until you see a pink-suited clay
doll. Defeat it and go left to the player change platform. change to Sasuke or Yae, go
left, dive, and swim right until you can surface. There is no Teahouse in Creep village,
so change to whoever you want to be NOW! Then, go right until you see a run-down bus
shelter with a post nearby, and stand under the post. Sometime near daybreak, a HUGE bus
will come and bring you to creep village. In Creep Village, you can get the last 4 entry
passes.

Insert four controllers and begin a game. Collect forty-four hands
  from various levels, press C-Right + Start on controllers three and four.

On Ryugo Island Kappa Road has two objectives! First you beat it normally then go back and
when you are at the cave's first pool of water you have to be Sasuke or Yae to do it. Dive
in and change to Sub Sasuke or Mermaid Yae then swim to your right. Go very far. When you
can't go any more go up and you will find some star blocks. Use Goemon's chain for that
[change into him] and you will beat the second objective!

In the game-over screen, Select 'Try Again' then repeatedly press A to make the
hoola-hoopa hoop faster!