Featuring 101 giant Sudoku 21x21 puzzles, sorted into order of increasing difficulty and printed on large, top-quality paper, this unique collection of puzzles is full of attractively-designed challenges from best-selling puzzle author Gareth Moore, author of many international books. Each puzzle can be solved by nothing more complex than simply scanning the 21 rows, 21 columns and 21 7x3 boxes, without having to make any pencil mark notes. Guessing is never needed, and there is a guaranteed unique solution. Visit www.PuzzleBooks.org for a full list of other titles in this series.