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The hallmark of puzzle genius: simple in appearance, but fiendishly compelling. In a nutshell, that's Sudoku-the most exciting development in the puzzle world since the crossword! Here for your number puzzle pleasure is a portable book crammed with Sudoku puzzles! This nifty little tome contains 88 puzzles for you to dig into, and you know what to do, right? Each puzzle is a 3 x 3 grid of nine 3 x 3 boxes. Some numbers are filled in, many spaces are blank-and your job is to fill in the spaces using the numbers 1 through 9, making sure that all of them appear only once in every column, row, and 3 x 3 box. Great number game fun for ages 8 and up.