I bought this to put in a bag of travel activities for the family to do on road trips.  One puzzle took my 11 year old 30 minutes to do and 30 minutes of quiet in a packed car is a valuable thing.  There are a couple pages that are too obvious as to what the end product will be and the kids bypassed those, but if they didn't know what the outcome was going to be (although there is a key in the back of the book), they were very eager to commit to the 1000+ dots.  I will buy another of these.