Gokigen Naname is a binary-determination logic puzzle published by what Japanese publisher that was established in 1980, and became prominent worldwide with the popularity of Sudoku?
Gokigen Naname: Gokigen Naname is a binary-determination logic puzzle published by Nikoli. Nikoli (publisher): Nikoli Co., Ltd. (Japanese: 株式会社ニコリ , Hepburn: Kabushiki-gaisha , Nikori) is a Japanese publisher that specializes in games and, especially, logic puzzles. "Nikoli" is also the nickname of a quarterly magazine (whose full name is "Puzzle Communication Nikoli") issued by the company in Tokyo. Nikoli (publisher):  "Nikoli" was established in 1980 and became prominent worldwide with the popularity of "Sudoku".
Nikoli Co., Ltd.