Nikoli Co., Ltd. is a publishing company which published the first puzzle magazine in Japan in 1980, and since then has specialized in puzzle publication.
The world-wide famous "Sudoku" puzzle was named by Nikoli company president Maki Kaji. We are the best puzzle company in the world, and have been developing and providing a wide range of puzzles. This is our web site!
nikoli.com will release 4 or more problems a day, about 130 problems a month of 16 kinds of puzzles, all new and including Slitherlink, Nurikabe, Heyawake, Akari, Hitori, Masyu, Shikaku, Hashiwokakero, Numberlink, Yajilin, Shakashaka, Satogaeri, Norinori, Kakuro, Sudoku and Ripple Effect.
None of these puzzles have been published before and all are totally new and original.
The nikoli.com web site consists of two parts; nikoli.com with "Everybody's page" which can be accessed by anyone and a page which is only for the members. All new problems are released on the members page, but some problems will be available on Everybody's page. When you become a member, you will be able to check all new problems and also save your puzzle solving history. If you are thinking about becoming a member, check out the members page.