From the Super Mario Wiki
Game Guy is a Shy Guy from Mario Party 3 who sports a bow tie and a natural showman's attitude. He runs a game show-esque gambling event that players must play when they land on his space. Player can usually double their coins or lose all coins, though they can risk their money for higher multiples. The games all revolve on luck. He owns and holds one of his four mini-games when a player lands on his space, which they can be Game Guy's Lucky 7, Game Guy's Magic Boxes, Game Guy's Roulette or Game Guy's Sweet Surprise. Players can also call Game Guy on themselves or other players by using the Lucky Charm without needing to land on his space.
The player can unlock the door where Game Guy is found, in the Game Guy Room, to be able to play his games at any time. Here, the player is given 10 coins and can bet any amount of coins held, up to 100 coins. The goal is to reach 1,000 coins, but losing all ends the game. Winning this challenge unlocks the rare minigame Mario's Puzzle Party Pro, a modified version of Mario's Puzzle Party.
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