Sudoku develops mental abilities, training them in the use of thinking skills, the ability to deal with problems and treatments, and learn to seize good opportunities. These 600 challenging sudoku puzzles will keep your mind sharp! puzzles developed to help people boost their memory, reasoning, creative thinking and problem solving. They also relax the mind and relieve stress. Solving Sudoku, in this book can provide vigorous mental workouts for everyone from youngsters to senior citizens.