Tetsuya Nishio Books

Higher Sudoku

By Tetsuya Nishio

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Even Higher Sudoku

By Tetsuya Nishio

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Original O'Ekaki

By Tetsuya Nishio

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Like sudoku, O'Ekaki (Paint by Numbers) provides an entertaining test of one's logic, using a grid as its playing field. But rather than leaving the player with boxes of numbers, O'Ekaki ends with...

O'Ekaki Heaven

By Tetsuya Nishio

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Like Sudoku, O'Ekaki provides an entertaining test of one's logic, using a grid of boxes as its playing field. But rather than leaving the player with nothing more than a bunch of numbers, O'Ekaki...

O ekaki Decadence

By Tetsuya Nishio

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Games Magazine Presents Paint by Numbers Other

By Games Magazine

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Extreme Sudoku

By Tetsuya Nishio

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Sudoku Hell

By Tetsuya Nishio

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Sudoku Plus, Volume One

By Nishio Tetsuya

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The puzzles in Sudoku Plus are conceived by Japan's greatest puzzle mind, Tetsuya Nishio, who takes extreme pleasure in handcreating his puzzles. His latest series, Sudoku Plus provides 101 Sudoku...

Sudoku Plus, Volume Two

By Nishio Tetsuya

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The puzzles in Sudoku Plus are conceived by Japan's greatest puzzle mind, Tetsuya Nishio, who takes extreme pleasure in handcreating his puzzles. His latest series, Sudoku Plus provides 101 Sudoku...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.