These are a nice set of puzzles at a great price. They are challenging and are fun to fiddle with when you need to just get away by yourself for a bit. Which just now gave me the idea that these would be loved by fidgeters. You need to focus and pay attention to what you’re doing to get these solved which would make these wonderful for the younger ones because it teaches them problem solving skills. The metal ones are great for parties. See who can get them apart the fastest wins a prize. Bottom line, lots of fun for any age!