This is a fun and easy little project to make. The solution is not intuitive so it might be a challenge for your friends and family. See solution video if you can't figure it out.
The back extra set of beads are not necessary. You will need ~ 30" of 1/4" rope as well.
Build Instructions (wood version): https://www.instructables.com/id/Rope-Puzzle/
Similar version on Amazon: http://amzn.to/2BhqxR7
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