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.
Build Instructions: https://www.instructables.com/id/Oliver-String-Puzzle/