Hein was a close associate of Martin Gardner and his work was frequently featured in Gardner 's Mathematical Games column in Scientific American . The game of Hex ( July 1957 ) , the Soma cube ( Sep 1958 ) , the game of Tangloids ( Dec 1959 ) and The Superellipse ( Sep 1965 ) At the age of 95 Gardner wrote his autobiography and titled it Undiluted Hocus-Pocus .