I chose this set because I wanted my child to be able to walk on marble for a reasonable price but didn't want to buy another toy with lots of little details and extras. We immediately assembled one of the rides - the pieces didn't fit together as easily as the duplos, but we still enjoyed watching the balls fly. Then we started adding our duplos to make it bigger and those parts of the battop don't go that well with the duplo at all. This is quite unusual as they look exactly the same in size, width and even thickness of each piece. You will likely need a digital thickness gauge to determine the difference in plastic thickness. At least the battop details fit, but with a lot of fiddling! This turned out to be quite frustrating for my 3.5 year old despite being quite an avid Duplo builder. They'll still get a STEM lesson in the marble run though, and will hopefully develop more determination as they try and try to put those pieces back together.
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