All Working Goemon's Great Adventure Cheats - Nintendo 64

Four player mode
Insert controllers into all four ports and begin game play using controllers one (and/or two). Collect forty-four entry passes from various levels. Then, press [C-Right] + [Start] on controllers three and four.

Alternate costumes
Unlock four player mode, then go to the "Prediction" house to access new costumes for each character.

Double coins
Wait until night to get two coins from an opponent that would normally only have one coin.

Unlimited lives
Go to the restaurant, buy sushi, and you will gain one life. go to the Inn, save and reset the game. You will have another hundred coins that you can buy sushi with again. Repeat to gain the desired amount of lives.

Run faster
Hold [B] when running in any town (not roads) to move a lot faster.

Falling blocks
When on the falling blocks, just walk to prevent them from falling.

Strange looking characters
Press [Z] to crouch, then hold [A] to get your character to stand up and appear as if they are always running. Note: If you jump, press [B] to attack, or get hit your appearance will change.