This is my take on the classic Oliver String Puzzle. It was built from scrap wood, a ring from a previous project, purchased wood beads and rope.

The goal is to remove the ring from the puzzle. My kids and wife found it quite challenging. I would rate the skill level at 3 out 5. If you can't figure it out from the pictures, refer to the video.

Besides the routed slot, I think the puzzle is pretty easy to build. I've also included STP and STL files (last step) for those inclined to 3D print it. You could also purchase a similar version from Amazon.*

*Amazon affiliate link