Game Guy Space is a rare space that Game Guy hosts in Mario Party 3. If the player landed on that space, Game Guy would fly by and take all of his or her coins, and then lead the player a Game Guy mini-game. These mostly luck-based mini-games would determine if the player took take the coins back multiplied (or more, depending on the mini-game), or if he or she lost them all. In order to lose them, the player simply had to lose Game Guy's mini-game.
Game Guy spaces don't make any appearance in any future Mario Party mini-game. The character himself, Game Guy, is also a one-shot character and is pending a new appearance.