Heyawake is a binary-determination logic puzzle published by what Japanese publisher that specializes in games, and especially, logic puzzles?
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" was established in 1980 and became prominent worldwide with the popularity of "Sudoku".
Birthday (company) Birthday Ltd. (バースデイ , Bāsudei ) is a Japanese video game developer and character design firm based in Akasaka, Minato, Tokyo. The company developed the "Kaijū Monogatari" games and designs of the manga and anime series "Fushigiboshi no Futagohime".