Great toy for leisure play. If the path is getting too predictable, then just rotate the board 90 degrees and there is a whole new pathway to solve (same pathway from a different perspective). Joyful game for hours.
Original model has a ball that can be printed too and a rim around the board if you need. I used a bearing ball as I felt nostalgic for that old times of puzzles. You can extend the rim in z-height a little to create additional height and slap on a clear piece of acryllic for more sturdy build and prevent the ball from slipping off when put aside. The walls are tall enough but, if you have kids around, or feel like using in bed, it might be helpful!
Hope you have as much fun as I did playing with this. Also a huge shoutout to the original designer to come up with this design!
The author remixed this model.