Title: The Best Hard Sudoku Book Out There
Product review: I love very difficult Sudoku puzzles. And I find Mr. Sheldon's to be the very best. They are very difficult. But they are fair and honest. No gimmicks. No tricks. After being disappointed by many "self-proclaimed" hard puzzle books, I hit on an interesting idea. Since it is impossible to remember a puzzle's solution long after you've solved it, I thought that working these puzzles a second time would be as challenging as the first. So I bought another copy and started in. Much to my delight, the puzzles were as new and fresh as my first time through. So I've now purchased five copies of Genius and another five copies of Master Class. At one puzzle a day, I'm set for almost four years.
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