“Puzzle Communication Nikoli Vol.194”
Nikoli is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“Nikoli Puzzle Book Reprint Edition Sudoku 2”
The puzzles in this volume are all the puzzles of “Pencil Puzzle Book Sudoku Vol.23”. This volume contains 100 puzzles.

“Japanese Fill-in Puzzles by Nikoli”
This book contains over 50 fill-in (In Japanese:”skeleton”) puzzles using a variety of Japanese words.

“Tappuri Suiri Puzzle (Logic Puzzle)”
This book contains over 50 logic puzzles. The contents of this book are in Japanese, so be prepared.

“Puzzle x Riddle: Challenge from the Riddlers’ Club”
“Puzzle x Riddle: Challenge from the Riddlers’ Club” contains over 40 puzzles that need a spark of inspiration and logical thinking. Knowledge of Japanese is necessary to solve puzzles in this book.

“Sudoku for Absolute Beginners”
This book contains very basic explanations of Sudoku, along with over 30 beginner-friendly Sudoku puzzles.

“Masterpiece selection of “Slitherlink for the very best” Vol.1”
This book contains over 100 challenging Slitherlink puzzles carefully selected from previous editions.

“Masterpiece selection of “Kakuro for the very best” Vol.1”
This book contains over 100 challenging kakuro puzzles carefully selected from previous editions.

“Sudoku Communication Vol.50”
This is a biannual Sudoku magazine with over 100 puzzles ranging from easy to hard. It also has a few puzzles other than Sudoku and articles related to Sudoku.

“Sudoku & Logic Puzzles for Home Vol.11”
“Sudoku & Logic Puzzles for Home Vol.11” contains about 80 puzzles, mainly Sudoku and Logic Puzzle.