We bought this marble walkway as a Christmas present for our 4 year old son on Prime Day. We also have a 200+ piece Nat Geo that he loves (and his mom and dad love him too). This set seems compatible, but I. i mean my son haven't played with it much and haven't combined this set with the Nat Geo set yet. We liked having 2 swirl/funnel parts. There is only one in our large Nat Geo set. I don't like that the marble catches are small compared to the much larger Nat Geo. This set contains the same number of balls (50) but only 5 of them glow in the dark. A mini UV lamp is not included and Nat Geo lamps will not simply glow in the dark if a mini UV lamp is not included. I have yet to try these glow in the dark orbs. I didn't think the glow in the dark balls were a big deal, but to be honest they're quite fun to play with when you turn off the lights. We have an 80 piece Whiz Builder Kids set. So far we are very happy with it. I'm not sure how much fun it would be on my own, and I'm not sure I would have enjoyed the marble runs as much in general had we not started with a bigger set, and I'm not sure we would actually only have a smaller sentence. give a good idea of how much fun it can be. We literally spend hours building and playing with marble walkways. I highly recommend it if you, I mean your kid, are mechanical or building enthusiasts.
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