Review on 🔬 Physics Fun Marble Add-On by Marble Genius by Matthew Fleming

I was so happy to get these and add them to our existing Marble Genius set. The "Y-Joints" are amazing, smooth, with a great mechanism to move the balls smoothly from side to side without defects. A great detail that greatly enhances our ability to run with the ball. The loop loop is amazing too. My kids didn't think they could flip the ball upside down. But it's easy, every time. And its color is different from any other items in the kits or add-ons so it sounds real. We had an issue with parts of the open track. The configurations are so cool and greatly improve the visibility of the track. We've found them to slow down the ball's speed, which is actually normal. But with a green eight, the balls always get stuck and don't go through the hole. So sad.