I give 3 stars for learning as it really is more of a physical toy. We didn't have any problems with her. Because it's wood, moisture and air conditioning will cause it to swell and shrink, making some of the holes bigger or smaller, making them harder to punch in or too loose. Of course, some kits may have manufacturing defects. We are okay. I believe the toy was designed so that different pins would be easier to hit and some harder for the physical work and mental aspect of hitting a lighter or stronger hammer. This is to get them to think a little bit about what to do. This is another toy that should be considered depending on the child. And if you're concerned about injury, if your child loves banging things on people like a lot of kids do, then the toy isn't to blame. Then a parent, guardian, or supervising adult should step in and teach the child not to tap on people. My son does the same, but I tell him we don't hit people and I put the hammer (or whatever) away for a while. All in all it's a good classic toy, better than the plastic ones, but yes, as with anything, you can go wrong, but it's easy enough to fix; give it back
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