Marble GeniusMarble Run Pipe & Sphere Accessory Add-on Set - 10 Pcs Total (4 Pipes, a Ramp, 5 Spheres), Alternating, Straight, & Tubes for Creating Exciting Mazes, Tracks, Runs, and Races

Once it's together very fun toy....

Fun and challenging for kids, better price than toy store

These are awesome. Kids love building and playing with marble tracks. Highly recommend as it adds a new dimension in terms of building possibilities.I give four stars only because like many other marble track sets, the quality leaves a little to be desired. In other words, they just don’t last as long as other toys, such as LEGO. But considering the price and fun kids have adding these to their tracks, it’s totality worth it.

My kids love this but it seems to need some kind of rubber mat under the legs. On the plastic table it often falls over when my kids are trying to add some pieces, especially with the tubes, but the absolutely love them.

My kids have been OBSESSED with marble run since they were really young, and have asked for it for every birthday and Christmas since. Needless to say, we’ve tried A LOT of them and this is by far the least favorite. It was fine to set up the first time but it never works as well as expected. The tunnels and their connectors are the problem. The other pieces work as well as expected

Start to STEM and fun too.

My mom got my son a marble run for Easter. Well, his Dad and I had so much fun putting it together we had to get more pieces to make it bigger and better. The pieces are very strong and fit together tightly to make it really sturdy. Its lots of fun to build it and see what you created at work.

First of all, I own two large sets of the Marble Genius brand Marble Runs, plus extra sets of tubes. My grandchildren and I absolutely love this toy, and the tubes are all sturdy and easy to fit together. They've made countless configurations and love challenging themselves to make others. However, the Pipes and Spheres accessory set is disappointing and more frustrating than fun. The ends of the pipes are difficult to attach to the colored tubes and the marbles can get stuck in the spheres.