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* Alert - Hard Sudoku puzzles by Lou Gruden are more difficult than other "hard" puzzles in newspapers or in most other Sudoku books. You will need to solve these puzzles using advanced logic techniques for:
Keep this large-print 8.5" x 11" book next to your favorite thinking chair or tear out a page to take with you on the go.
To help you confidently select puzzles at the level you want, Puzzle Books Plus is committed to using a consistent grading standard for our Sudoku books. We determine difficulty by the logic techniques needed to solve the puzzle. Use the Look Inside feature to see the logic techniques used for Hard Sudoku see a sample of the puzzles.
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Take 20% off your first order
Enter the code below at checkout to get 20% off your first order