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The world’s most difficult sudoku puzzle

Finnish mathematician Arto Inkala recently claimed to have created the world’s hardest Sudoku puzzle. Based on the number of deductions that need to be made to fill in a single cell, this puzzle achieves a difficulty rating of 11 stars, compared with five stars for the average newspaper sudoku. Can you crack it? Have a go. If you get stuck — or rather, when you get stuck — just paste the following grid into Bill DuPree’s sudoku solver, which will solve it for you in a fraction of a second. Thanks, Bill! 8 . . . . . . . . . . 3 6 . . . . . . 7 . . 9 . 2 . . . 5 . . . 7 . . . . . . . 4 5 7 . . . . . 1 . . . 3 . . . 1 . . . . 6 8 . . 8 5 . . . 1 . . 9 . . . . 4 . . Incidentally, if you install Bill’s software on your [More…]

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Header image: Maple leaves and bamboo stems in autumn at Tenryū-ji garden (天龍寺庭園) in Kyoto. Photo: Frank Gualtieri.

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