Atama no Taisou

lit. 'Head Gymnastics' (頭の体操) is a series of puzzle collections that were released by Kobunsha, and written by Akira Tago. , there were 23 regular volumes with an e-book volume released.

The first volume was published in 1966 and sold more than 2.5million. The series has sold 12million copies and become a best-seller in that year.