This is the ultimate challenge. Sudoku Grandmaster Challenge is for experienced solvers who want the toughest puzzles and the deepest sense of accomplishment. Inside: 200 of the hardest Sudoku puzzles Complex logic that rewards expert skill Clean layouts for serious solving Solutions included Perfect for: ¿ Elite Sudoku players ¿ Hardcore logic puzzle fans ¿ Anyone seeking the highest level of mental challenge The final level of the Sudoku Skill Builder Series
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