Sugoroku Mutou (武藤 双六 Mutō Sugoroku), known as Solomon Moto in the English anime, is a fictional character in the manga and anime series Yu-Gi-Oh!.

In the English manga, his family name is usually spelled Mutou but is sometimes rendered as Mutoh. In addition, his family name is rendered Mutou in the uncut anime DVDs. In the Yu-Gi-Oh! Eternal Duelist's Soul video game, he is known as Trusdale. In other video games and by most people in the anime and manga he is simply called "Grandpa". In the English Yu-Gi-Oh! The Duelists of the Roses video game, he is Jasper Dice Tudor.

Sugoroku Mutou is the grandfather of Yugi Mutou (Yugi Moto), who calls him "Grandpa". Sugoroku gave Yugi the Millennium Puzzle as a present. He owns the Kame (Turtle) Game shop, where Yugi and his friends get several of the games they play. Sugoroku is the reincarnation of Siamun Muran (シモン・ムーラン, spelled "Shimon Muran" in the video games, and spelled "Siamun" in the English manga), Pharaoh Atem's right hand man.

Early in the manga, Yugi and his best friend Katsuya Jonouchi (Joey Wheeler) bring games from Sugoroku's shop to school. Sugoroku uses this to boost business at his store, as he knows that children will come into his shop wanting to play the games that he sells there.

In the first chapter of the manga, Sugoroku displays traits of the "dirty old man" by asking Anzu Mazaki (Téa Gardner) if her breast size has reached 32" yet.

In the second series anime, he competes in Kaiba's KaibaCorp Grand Prix tournament under the alias "Mask of Rock", yet Jonouchi a.k.a. Joey manages to defeat him.

"Sugoroku" is a Japanese game similar to Backgammon.

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