Works great and 6 and 3.5 years old liked it. It was mostly played with a birthday present eclipsing Lego, a RC car, a chemistry set and wooden train tracks. Barbie babies, finger puppets, etc. I see these pieces becoming part of any design. FYI, the 3 year old couldn't put the pieces together by herself like she does with other tiles. FYI, the description says the marble is wooden while ours is plastic. . They work well so we didn't care. They are much larger than the classic balls, so they are not easy to lose. I don't know if they pose a choking hazard to small children.
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