When you buy this book you get an electronic version (PDF file) of the interior of this book. You can play the puzzles in this book on your mobile phone! Become a master in solving different sizes of Sudoku. You get the perfect mix of different sizes of Sudoku to keep you entertained for weeks. After solving all the puzzle in this book, you will be a Sudoku Pro. You start with easy Sudoku puzzle, which keep getting bigger and bigger and you gradually build your way up to extremely difficult Sudoku puzzle. 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. Sudoku Mixed Grids Deluxe - Easy to Extreme is a collection of 476 puzzle: 22 easy Sudoku puzzle per grid size (9x9, 10x10, 12x12, 15x15, 16x16), totaling 110 easy puzzle 22 medium Sudoku puzzle per grid size (9x9, 10x10, 12x12, 15x15, 16x16), totaling 110 medium puzzle 22 hard Sudoku puzzle per grid size (9x9, 10x10, 12x12, 15x15, 16x16), totaling 110 hard puzzle 22 extreme Sudoku puzzle per grid size (9x9, 10x10, 12x12, 15x15, 16x16), totaling 110 extreme puzzle 36 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. 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 puzzle 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 or Soduku.