Hard Sudoku puzzles just for you, the Sudoku enthusiast This book includes 200 hard level Sudoku puzzles (4 puzzles to a page) in a nice large book format.Sudoku can help keep your brain sharp and healthy. Sudoku is a great hobby that encourages problem-solving, memory and logic. Studies show it can help slow Alzheimer's, too. Watch for our brain teasers and puzzles on Amazon
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