If you already like the classic 9x9 Sudoku you will love the 16x16 Sudoku: 16x16 Sudoku puzzles work in the same way as the classic version only that you have 16 numbers instead of 9! The Sudoku 16 x 16 puzzle book is the perfect gift for adults who love brain jogging and mental exercises. The puzzles in the "Medium" version are ideal for those that want a more challenging set of puzzles than the "Easy" version has to offer. Each puzzle has a unique solution that can be completed using simple logic. 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. Buy now!