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Product description This daily Sudoku X 16x16 puzzle calendar 2016 is a must have puzzle book for every Sudoku X enthusiast. Each day you get to solve a difficult or extremely difficult Sudoku X puzzle. This Sudoku X calendar contains 366 very difficult Sudoku X puzzles to keep you entertained in 2016. Once you pick up this book, you won’t be able to put it back down. You have been warned! Only 1 large print puzzle per page, with lots of white space for scribbling. I guarantee that every logic puzzle in this Sudoku X puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzles in this book will appear in any of the other English PuzzleBooks.net books. Sudoku X is also known as Diagonal Sudoku, Kokonotsu, Taikakusen Nanpure, Diagonal Line Number Place, Sudoku-X.