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The Ultimate Sudoku Challenge

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Confident solvers who think they ve got Sudoku down cold will have to think again, because these are absolutely the most fiendishly difficult, devilishly baffling Sudokus ever devisedand the biggest, too. Created by hand in Japanfrom Nikoli, the company responsible for the puzzles popularity in that countrythe collection includes megasudokus on a 25 x 25 grid, designed to give even the sharpest minds a workout. True to its title, it s the ultimate challenge, and one that millions of Sudoku-obsessed fans will find ...

The Ultimate Sudoku Challenge 2005, Sterling Publishing (NY)

ISBN-13: 9781402736490

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