WHAT'S IN A NAME? Su means number in Japanese Doku translates as singular or solitary, or can mean bachelor. The number game was invented under the name Carré Latin by the Swiss mathematician Leonhard Euler in the 18th century. In April 1984 the magazine publisher Nikoli published this riddle in Japan in the magazine Monthly Nikolist. In 1986 it received today´s popular shape. In November 2004 Gould was successful in calling the attention of the British Newspaper “The Times“ for this riddle. There it was published right away. Only a few days later “The Daily Mail“ followed with the riddle under the name Codenumbe. In the meantime SUDOKU belongs to the standard of many riddle pages in magazines.