This daily CalcuDoku puzzle calendar 2015 is a must have puzzle book for every CalcuDoku enthusiast. Each day you get to solve a difficult or extremely difficult CalcuDoku 9x9 puzzle. This CalcuDoku calendar contains 365 very difficult CalcuDoku 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 CalcuDoku 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.CalcuDoku is also known as Square Wisdom, CanCan, MinuPlu, Mathdoku and Calcu-Doku.