This Hard Sudoku Puzzle Book Volume 4 has been designed for fun for all ages and can be played by children, adults and senior citizens alike - suitable for all advanced sudoku puzzle lovers Perfect for stimulating the mind and improving reasoning skills, this book contains 200 hard difficulty level sudoku puzzles with solutions for each of the puzzles. A 'Beginners Guide' is included providing valuable tips for solving the puzzles. Whatever your age, you'll love this Hard Sudoku Puzzle Book This puzzle book is an ideal challenge for the advanced Sudoku player and will provide hours of puzzling fun and enjoyment.