The marble bridge has nice colors and the parts are solid. However, once assembled, they are fairly easy to knock over. Also, the part that collects the balls is connected to the base of the track. My 4.5 and 3 year old sons keep tipping over the track trying to collect marbles. Be careful because this part is connected. To solve this problem, I removed the gathering legs and replaced them with two regular legs, leaving the orbs scattered across the floor. I don't mind the balls flying now, but sacrificing those two legs has also made him unstable, although they don't have to touch him as much now. I could try to stabilize it by attaching it to the base, but that then makes it impossible for me to create other structures. We were happy about that. I don't like it, but I can't take it away from the kids now.
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