Sudoku is the simple number puzzle that has swept the world and obsessed millions of puzzlers of all ages. It takes no mathematical knowledge and you don't need a large vocabulary. All it takes is a pencil and some logic. In this compilation there are 200 puzzles ranging from 'nice and easy' to 'fiendishly difficult'. From simple puzzles a nine-year-old could complete to megasudoku grids of 25 X 25, work through the book to become a master puzzler. The pocket-book format means that you can work on a Sudoku anywhere - whilst commuting, on the beach, or on a lunch break.