Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good toy but difficult to build

It's a good toy but its definitely tough to build for kids. There are some difficult steps requiring bending of the metal pieces while trying to put in screws through hard-to-put places. I'm embarrassed to admit that I'm in my mid-twenties and that the instructions still required my full strength and dexterity to get some of the nuts and bolts into place.