This puzzle is made of strong but thin plywood. The details are solid and well carved. You must be careful when stamping parts as some parts have small parts that you can damage if you don't remember what you are doing. The result is a very complex Rube Goldberg type marble walkway. Very entertaining. A few places in the instructions are a bit ambiguous and could be used by an adult, but my 10 year old grandson did the actual assembly. In fact, we spent most of the morning, afternoon and evening in the assembly process. He didn't want to stop until it was over. Any project that can hold a 10 year old's attention for that long is a great project.
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