Building is difficult due to missing parts. I requested a replacement but it was still missing the same parts and I couldn't find a website to order replacement parts. I ordered 100 lego/duplos and 2 panels for extra stability and they work great! It's worth it!
168Pcs Gifts2U STEM Learning Educational Construction Marble Run Toy Set - Includes 136 Translucent Plastic Pieces And 32 Glass Marbles - Fun Parent-Child Game And Building Block Toy
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37 Review