250 Puzzles: Sudoku is a great value puzzle book created to stimulate minds and build mental focus. The wire binding of the book readily lays flat, enabling puzzlers to write the solutions with ease. Containing 250 puzzles ranging in difficulty from ‘simple’ to ‘diabolical’, this book provides hours of entertainment – with the extra benefit of sharpening your mental acuity. 250 Puzzles: Sudoku is ideal for new and seasoned puzzlers alike!