This daily Sudoku puzzle calendar 2015 is a must have puzzle book for every Sudoku enthusiast. Each day you get to solve a difficult or extremely difficult Sudoku puzzle. This Sudoku calendar contains 365 very difficult Sudoku puzzles to keep you entertained in 2015. 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 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 is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku and Soduku.