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 age, people love this Hard Difficulty Sudoku Puzzle book This puzzle book makes an excellent gift and is an ideal challenge for the advanced Sudoku player.