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This book features the following: -500 puzzle grids -Medium and hard level puzzles, arranged in order of difficulty -Large print font for prevention of eye-strain -Simple instructions -All solutions Sit back, put your feet up, and get ready to relax with this great collection of Sudoku puzzles guaranteed to bring a little piece of joy to your daily life. So what are you waiting for? Grab yourself a copy! (Hint: This collection also makes a great gift to the Sudoku fanatic in your life!) Pssst...one more thing. Did you know the American Alzheimer's Association has endorsed Sudoku as a brain game that might help to reduce risk of dementia as we get older? That's what we call a win win in the business!