Each edition of the series contains Sudoku puzzles in three levels of difficulty: and . Sudoku puzzles are with a variety of predefined numbers. There are four puzzles per page whereby each number square in a Sudoku provides as you work through the puzzle. All puzzles can be easily solved by excluding numbers by process of elimination from other columns, rows, or boxes, and have at a time. This book contains as well as for each of the 200 puzzles.