Make a Eureka or Wits End puzzle with scrap materials. For more details on this puzzle and how to solve, check out Fleb's channel on youtube.
Fleb on youtube https://www.youtube.com/watch?v=akigl5acZ_c
Wits end dimensions pdf http://trevorsworkshop.com/downloads/pdf/wits_end.pdf
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Check out http://trevorsworkshop.com/ for more information.
Music: www.bensound.com