My 3 year old toddler loves building tunnels for his marbles or making tunnel ramps for his cars. He will use other objects he has outdoors to raise the tunnel up higher, so the marbles/cars can go down faster and so forth. He has a good time changing the fittings around and the possibilities are endless, it never gets boring for him!
Note: Make sure to sand down the edges, as they can be rough from cutting the PVC pipe.
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