This hard difficulty sudoku puzzle book has been created for fun for all ages and can be played by children, adults and senior citizens alike - suitable for all 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 Enjoy hours of puzzling fun with these hard difficulty sudoku puzzles.