“Nankan(Hard)Sudoku 18”
“Nankan (Hard) Sudoku” contains 105 sudoku puzzles.

“ChoGekikara (Really really hard) Sudoku 18”
“Cho-Gekikara (Really, really hard) Sudoku” contains 91 sudoku puzzles.

“Puzzle Communication Nikoli Vol.193”
Nikoli is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“Nikoli Puzzle Book Reprint Edition Suiri Puzzle 3 (Logic Puzzles 3)”
The puzzles in this volume are all the puzzles of “Pencil Puzzle Book Suiri Puzzle Vol.10”. This volume contains 57 puzzles.

“The Pencil Puzzles 2026”
The Pencil Puzzles 20xx series are the renewal versions of our best sellers “Penpa 20xx” series. The book contains about 260 number puzzles, includes English explanation.

“CROSS-BE — Japan Crossword 100th Anniversary Special Edition”
“CROSS-BE” was a Japanese crossword puzzle magazine that was regularly published by Nikoli. To celebrate the 100th anniversary of crossword puzzles in Japan, it will return as a special issue in 2025.

“Have a Ball with Pencil Puzzles – Shikaku 1”
This book contains about 90 Shikaku puzzles ranging from easy to hard.

“Have a Ball with Pencil Puzzles – Slitherlink 5”
“Have a Ball with Pencil Puzzles Slitherlink5” contains about 90 Slitherlink puzzles ranging from easy to hard.

“Have a Ball with Pencil Puzzles – Kakuro 5”
This book contains about 90 Kakuro puzzles ranging from easy to hard.

“Mainichi Sudoku for Beginners”
The volume has 90 easy Sudoku puzzles from the Mainichi Newspaper.