“Have a Ball with Pencil Puzzles – Slitherlink4”
This book contains about 90 slitherlink puzzles ranging from easy to hard.

“Have a Ball with Pencil Puzzles – Kakuro 4”
This book contains about 90 Kakuro puzzles ranging from easy to hard.

“Medium Sudoku Best Selection”
This book contains 116 Sudoku puzzles, all of medium difficulty.
These puzzles were published in the NIKOLI “Sudoku Communication” and have been re-edited with the excellent results published here.

“Sudoku Strategy Guide (Revised Edition)”
This is a revised edition of the “Sudoku Strategy Guide” published by Nikoli in 2007. It will satisfy everyone from beginners to those who want to be able to solve more difficult problems.

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

“The Pencil Puzzles 2025”
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.

“Puzzle Communication Nikoli Vol.188”
Nikoli is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“Enjoyable and doable! Easy Sudoku”
contains 75 easy sudoku problems for beginners.

“Sudoku Communication Vol.47”
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.

“Otegaru Suiri Puzzle (Logic Puzzle)”
This volume contains over 50 Logic Puzzles from “Sudoku & Logic Puzzles for Home” Vol.1 to 4.