Question: Heyawake is a binary-determination logic puzzle published by what Japanese publisher that specializes in games, and especially, logic puzzles?
Related documents: [0]  [DOC] Heyawake (Japanese: へやわけ, "divided rooms") is a binary-determination logic puzzle published by Nikoli. As of 2013, five books consisting entirely of "Heyawake" puzzles have been published by Nikoli. It first appeared in "Puzzle Communication Nikoli" #39 (September 1992). [END] 
[1]  [DOC] 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". [END] 
Answer: 
Nikoli Co., Ltd.
Nikoli Co., Ltd.