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! Sudoku is a fun and addicting logic puzzle game. Sudoku is ideal to introduce your child to inequality signs and logical thinking. Sudoku teaches your child logical thinking and deductive reasoning skills, even at a young age. Sudoku improves critical thinking and making quick decisions based upon available evidence. Sudoku is a brain game that helps to train the brain of your child. In addition, Sudoku demands attention to detail - noticing patterns, spotting opportunities, and finding the right moment to make a move. Sudoku is not only fun and interesting – it might just help prepare your kids for better success in school and in life. Only 1 large print puzzle per page, with lots of white space for scribbling. Sudoku For Kids Mixed Grids - Easy to Extreme is a collection of 145 puzzle: 12 easy Sudoku puzzle per grid size (6x6, 8x8, 9x9), totaling 36 easy puzzle 12 medium Sudoku puzzle per grid size (6x6, 8x8, 9x9), totaling 36 medium puzzle 12 hard Sudoku puzzle per grid size (6x6, 8x8, 9x9), totaling 36 hard puzzle 16 extreme Sudoku puzzle per grid size (6x6, 8x8, 9x9), totaling 16 extreme puzzle 21 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.