This sturdy puzzle book is great. We have two of them in the house because neither of us can leave it alone for long. The spiral binding is a must- have. (I paper clipped the top of the spiral closed.) The pages are of substantial quality and are completely eraseable (although I don't recommend the eraser on your pencil - it smudges - a big pink eraser is best). The printed numbers are large and easy to read. The puzzles themselves are very challenging and interesting - I would recommend this book to anyone. Buy Will Shortz Presents The Little Black Book of Sudoku: 400 Puzzles (Will Shortz Presents...)!
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