Compiled by the creator of The Telegraph's bestselling Sudoku series, this quality set is packed with 400 brand new puzzles and contains more original sudoku than any other. The four books come in an attractive slipcase and are coloured according to difficulty: blue for `gentle', green for `moderate', purple for `tough' and red for `diabolical' - guaranteed to satisfy solvers across the spectrum. Each book is compact, light and easy to slip into a bag, briefcase or jacket pocket, yet together with their case they make a unique set - endorsed by one of sudoku's leading names.