Aaron and I decided to make something out of cardboard. And sell it in an auction.  The idea changed to making a marble-coaster. We got the idea and inspired by this video. We are doing this to raise money for the charity. I hope I can build a marble run that can amaze everyone. However, the run was not the same all the time. There were changes all the time.

–> https://www.youtube.com/watch?v=BvMxjjXcUzc&t=563s