Marble GeniusWaterslides & Roller Coasters - Marble Run Accessory Set (5 Pcs.)

My kids enjoyed playing with this and adding it to their main set.

I purchased these parts for my 4 year old Grandson to use with a set I had purchased earlier this year. These parts adopted well yo his current set. He LOVES these parts because they are more sturdy than the original set. He spends HOURS building new mazes. I would highly recommend this product .

This set is great! When used in conjunction with other Marble Genius sets and marbles (sometimes included with the boxed sets, like this one), you will not experience the problem of marbles either falling through or getting stuck in the “roller coaster track” sections, as was noted by several users. This was rigoursly tested by Junior High Science students. They are quite sturdy.

My 4 year old can't get enough Marble Run Stuff. These work with the combined 2 (different) sets we already had, and were easy to assemble. Work great for daily use. The loop piece works but you need a 'fast piece' before it to do the loop properly.

My son loves it. He was able to connect it to most marble runs.