Remembering Kaji Maki, the “Father of Sūdoku”

Gotō Yoshibumi, chair of the Japan Sūdoku Association. (© Nippon.com)

A Sūdoku puzzle appears in the May 9, 2005, Guardian. (© Jiji)

Kaji Maki in the last year of his life. (Courtesy Gotō Yoshibumi)