this post was submitted on 23 Oct 2025
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This puzzle is always presented as difficult, but why not just ask a known? If your eyes are brown just ask “Are my eyes brown?” You’d immediately know which one lies or tells the truth.
E: I missed the limit of one question.
Then you still don't know which door is the correct one, you've just learned which guard tells the truth and you've used up your one question. The trick is to ask which door the other guard would tell you is the correct one and then go through the other door. If you've asked the lying guard, they'll lie about what the honest one would say and point you towards the wrong door. If you asked the honest one, they'll truthfully tell you what the lying guard would say and also point you towards the wrong door