Sudoku is a fun and challenging number puzzle that is one of the most popular in the world. Sudoku For All Ages contains over 400 Sudoku puzzles that can be enjoyed by anyone of any age. The puzzles range from small easy ones that are great for children and large difficult ones for adults. Along with the tradition 9 x 9 puzzles that everyone is familiar with there are puzzle sizes as small as 4 x 4 and 6 x 6 and as big as 16 x 16. All puzzles have a solution for you to check or just to need help. 210 Pages.