200 puzzles and more than 20 different types of puzzles will get your brain working. While calculating, combining, and comparing, not only is your mind exercised, but fun and excitement also come into play. With varying difficulty levels and solution times for these number puzzles, there’s something for everyone. And if you ever get stuck, the solutions can be found at the end of the puzzle book. Over 20 different types of number puzzles, 200 times to calculate, combine, and compare - all for just 5 euros. Available in different difficulty levels and solution times. More concentration, variety, excitement, and brain training - less stress. Features: continuous black and white illustrations.