Gifted to my 13 year old who loves Lego, engineering and construction. He used similar building projects from his engineering class at school. He said that this one is of the best quality as all the parts fit together perfectly and no trimming or sanding is required. The direction was clear. His only complaint was that after assembling one of the pieces doesn't always move properly, so the ball doesn't move along the path. On the whole he was happy with it.
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