Heyawake is a binary-determination logic puzzle published by what Japanese publisher that specializes in games, and especially, logic puzzles?
Nikoli Co., Ltd.
Title: Kuromasu
Passage: Kuromasu (Japanese:黒どこ "kurodoko") is a binary-determination logic puzzle published by Nikoli.  As of 2005, one book consisting entirely of Kuromasu puzzles has been published by Nikoli.
Title: Ripple Effect (puzzle)
Passage: Ripple Effect (Japanese:波及効果 "Hakyuu Kouka") is a logic puzzle published by Nikoli.  As of 2007, two books consisting entirely of "Ripple Effect" puzzles have been published by Nikoli.  The second was published on October 4, 2007.
Title: Gokigen Naname
Passage: Gokigen Naname is a binary-determination logic puzzle published by Nikoli.
Title: Shikaku
Passage: Shikaku (四角に切れ , shikaku ni kire ) (also anglicised as "Divide by Squares" or "Divide by Box") is a logic puzzle published by Nikoli.  As of 2011, two books consisting entirely of Shikaku puzzles has been published by Nikoli.
Title: Puzzle
Passage: A puzzle is a game, problem, or toy that tests a person's ingenuity or knowledge.  In a puzzle, the solver is expected to put pieces together in a logical way, in order to arrive at the correct solution of the puzzle.  There are different genres of puzzles, such as crossword puzzles, word-search puzzles, number puzzles, or logic puzzles.
Title: Heyawake
Passage: 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).
Title: Light Up (puzzle)
Passage: Light Up (Japanese:美術館 "bijutsukan", art gallery), also called Akari, is a binary-determination logic puzzle published by Nikoli.  As of 2011, three books consisting entirely of "Light Up" puzzles have been published by Nikoli.
Title: Nikoli (publisher)
Passage: 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".
Title: Bag (puzzle)
Passage: Bag (also called Corral or Cave) is a binary-determination logic puzzle published by Nikoli.
Title: Hotaru Beam
Passage: Hotaru Beam is a binary-determination logic puzzle published by Nikoli.
Nikoli (publisher) Heyawake