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I did not realize you could create a unicursal #maze out of an ordinary branching maze by placing a wall in the middle of each corridor!

https://twitter.com/aemkei/status/1388610729855553549

This makes sense in that it's sort of enforcing the "right-hand rule" by taking away all your choices, guiding you along the path that the RHR would take on the original maze -- and that path is deterministic and thus necessarily branch-free.