This extension splitter was a complete disappointment .The pieces were difficult to put together and it was frustrating to see the marbles get stuck in certain areas. After trying this product, I wouldn`t recommend it to anyone. While it does provide additional pieces for the Gravitrax marble run, the frustration it causes simply isn't worth it. As a parent looking for quality toys and games for my kids' learning and education, I would suggest looking elsewhere for a more reliable marble run extension..
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