this post was submitted on 23 Oct 2025
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[–] RememberTheApollo_@lemmy.world 11 points 4 months ago* (last edited 4 months ago) (3 children)

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.

[–] JackbyDev@programming.dev 14 points 4 months ago

Knowing who lies and who tells the truth doesn't tell you which door leads to the prize and which to death.

[–] Edge004@lemmy.zip 13 points 4 months ago (1 children)

The difficulty comes from only being able to ask one question. It's very easy to figure out the liar, but it's much more difficult to figure out the liar and the correct door in the same question

[–] Aqarius@lemmy.world 4 points 4 months ago

In fact, the lying guard is a red herring. You get one question, and need one piece of info: the door. The canonical question doesn't tell you which guard lies, nor do you care to find out.