This daily Tridoku puzzle calendar 2015 is a must have puzzle book for every Tridoku enthusiast. Each day you get to solve a difficult or extremely difficult Tridoku puzzle. This Tridoku calendar contains 365 very difficult Tridoku 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 Tridoku 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.Tridoku is also known as Triangular Sudoku.