Roller Coaster 3D Wooden Puzzles Marble Run Kit

It was a fun build, and enjoyable to watch run. One track needed slight adjustments before it would run properly, and roughly one out of every twenty-five balls falls off the track at the bottom of the screw. I'm not quite sure how to fix that.

This is my 4th and 5th new puzzles in the last several weeks. They reduced the price to where I can purchase more as I plan on giving these away