My kids love to build this set and love it. We wish we had more parts for the money though. You can't build a decent rig for your marbles to work with just that one box, especially if you want them bigger. The pieces are a little stiff to open and it takes a bit of effort to put them together, but after a few times they work fine. Overall this is a good kit and my daughter likes it the best. But she always asks others to take more pieces.
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