I bought this book because it is beautiful and it looked like fun brain exercise. But much to my disappointment I found too many mistakes in the answers. A good example is the very pretty Pick Up Sticks. The answer in the back is most definitely wrong! I find this type of error in this type of book to be unacceptable, and think it could be very frustrating and discouraging to a person that might not be able to tell whether or not their answer was indeed correct and the book was wrong. I returned my copy to the book store.