Asked by: Anonymous
It’s possible to escape many mazes by walking round them keeping one hand in constant contact with the wall. But some mazes are designed to defeat this technique, and need Tremaux’s Rule: at each junction, choose any route, back-tracking only if it leads to a dead end or a junction you’ve already visited. If you come to an old junction by a path you’ve taken before, take a new path if possible; otherwise, take a path used not more than once before.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.