The iPhone App “Sudoku — Official Nikoli” is now available.

200 Nikoli Sudoku puzzles (20 beginner, 60 easy, 60 medium, and 60 hard) are available.

Of these, up to 130 questions (20 beginner, 60 easy, 40 medium, and 10 hard) can be solved for free.
The remaining 70 questions (20 medium and 50 hard) are charged. You will be able to solve them by paying in the app.

The Android version is not yet released.
If you have an iPhone, please download it!

# iPhone App “Sudoku — Official Nikoli”
https://apps.apple.com/us/app/sudoku-official-nikoli/id6444442602

*The app is provided by Crisp Co.,Ltd.
Please contact Crisp Co.,Ltd. with any inquiries, including inquiries regarding problems.

“Puzzle Communication Nikoli Vol.181”
Nikoli is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“ChoGekikara (Really really hard) Sudoku 12”
“Cho-Gekikara (Really, really hard) Sudoku” contains 91 sudoku puzzles.

“Nankan(Hard)Sudoku 12”
“Nankan (Hard) Sudoku” contains 105 sudoku puzzles.

“Brilliant Mistake”
This is a critical biography of Maki Kaji, the man known as the “Godfather of Sudoku”. (Written in Japanese)

“Puzzle Communication Nikoli Vol.180”
Nikoli is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“C’mon! Easy Sudoku”
75 easy sudoku problems for beginners!

“Sudoku Communication Vol.43”
This book contains about 120 well-crafted sudoku problems. Also, some extra problems and columns.

“Shikaku Collection”
This book contains over 90 Shikaku puzzles.
This is a re-edited version of “Pencil Puzzle Book Shikaku” Vols.1-3.

As already announced the Nikoli smartphone app “SmartNikoli” is discontinued from July 31 2022 (JST) and all operation for this app is terminated.
All membership details of registered members has been deleted.
We wish to express our appreciation and thanks to everybody who have made the operation of SmartNikoli possible during the more than three years since the start in May 2019. First of all we extend a heartfelt thank you to everybody involved in playing our puzzles on SmartNikoli.

This is the end of SmartNikoli, but we are now developing new exciting projects for you to enjoy with our puzzles. Please look forward to news about that as it gets ready.