Nikoli Books

The Ultimate Sudoku Challenge
The Ultimate Sudoku Challenge

By Nikoli

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Nurikabe and Sudoku
Nurikabe and Sudoku

By Nikoli

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Heyawake and Sudoku
Heyawake and Sudoku

By Nikoli

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Akari and Sudoku
Akari and Sudoku

By Nikoli

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Fillomino and Sudoku
Fillomino and Sudoku

By Nikoli

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Hashi and Sudoku
Hashi and Sudoku

By Nikoli

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Hitori and Sudoku
Hitori and Sudoku

By Nikoli

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Ripple Effect and Sudoku
Ripple Effect and Sudoku

By Nikoli

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Shikaku and Sudoku
Shikaku and Sudoku

By Nikoli

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Yajilin and Sudoku
Yajilin and Sudoku

By Nikoli

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Related Articles from our Blog

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.

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