Greg Costikyan Books

By the Sword

By Greg Costikyan

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The Willow Game

By Greg Costikyan

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Uncertainty in Games

By Greg Costikyan

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Uncertainty in Games

By Greg Costikyan

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How uncertainty in games—from D&D and Super Mario Bros. to Rock/Paper/Scissors—engages players and shapes play experiences.In life, uncertainty surrounds us. Things that we thought were good for us...

By the sword

By Greg Costikyan

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First contract

By Greg Costikyan

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By The Sword Magic of the Plains

By Greg Costikyan

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One Quest Hold the Dragons Cups and Sorcery No 2

By Greg Costikyan

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Acute Paranoia Paranoia RPG

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Price of Freedom

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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.