I love it, my kids love it. So much fun to build, so many opportunities for creativity. My son's teacher said that his ability to lay marble paths and paths at school is superior to that of other children. I trust this toy in part because you need to be critical of the technical levels and runs and what rectangular pieces will give you the desired result with the balls. In that sense, this is a great STEM toy. We shop for extra parts and sets. And I like that it's mostly made of wood. In that sense, it feels much more comfortable and is more beautiful compared to thin plastic marble bars.
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