Sugoroku Mutou is the grandfather of Yugi, who calls him "Grandpa" (Jii-chan). "Sugoroku" is a Japanese game similar to Backgammon. Solomon gave Yugi the Millennium Puzzle as a present. He owns the Kame Game shop, where Yugi and his friends get several of the games they play. Sugoroku is the present day counterpart of Shimon Muran.