
Love this for all the potential of STEM learning. It can teach basic math as it is a unit block system, teaches dynamics to children and quite challenges them to create stable support structures. My 4 year old loves them. It's been over two weeks since Christmas and she still plays with it every day, barely paying attention to all the other toys she has. You don't get anything other than track pieces, meaning you don't pay extra for Duplo base blocks like you do with other sets. I just bought a cheap box of Duplo Basic as a resource, plus a small amount I left behind when she was a toddler.

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