Grandpa is a character in the video game, Yu-Gi-Oh! Dungeon Dice Monsters. He is the game's incarnation of Sugoroku Mutou from the Yu-Gi-Oh! manga.
He runs a shop, where the player can purchase dice and take part in tournaments. He is also available as an opponent.
Yugi's grandfather and a genius-level gamer. In his younger days, he gained legend status for never losing a single battle.
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