The vast majority of sudoku puzzles that are labeled "hard, " "expert, " "challenger, " are not really all that difficult. And in a surprising number of cases, they are downright easy...
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Amazingly difficult sudoku puzzles from the ultimate IQ testers, Mensa...
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Go way beyond difficult, with the hardest, most brain-busting sudoku you've ever seenCalling all sudoku-solving diehards: with every puzzle requiring upper-level strategies, this...
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This title includes 300 puzzles from prolific & popular puzzle & sudoku author - Frank Longo. It takes a page from karate - another Japanese art - each title is graded by colour: White...
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This series features a friendly pocketable design with a focus on mindfulness; this volume features 105 easy to hard sudoku puzzles...
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