Become a master in solving classic Sudoku 9x9. After solving all the puzzles in this book, you will be a Sudoku Pro. You start with easy Sudoku puzzles and you gradually build your way up to extremely hard Sudoku puzzles. The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 to 9 exactly once. Classic Sudoku 9x9 - Easy to Extreme is a collection of 276 puzzles: 54 easy Sudoku 9x9 puzzles 54 medium Sudoku 9x9 puzzles 54 hard Sudoku 9x9 puzzles 54 extreme Sudoku 9x9 puzzles 60 extra logic puzzles 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 puzzles in this book will appear in any of the other PuzzleBooks.net books. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku and Soduku.