How Sarah worked out the puzzle in the 1986 movie Labyrinth

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Link to the scene: https://youtu.be/grOpvXBmTx8?si=7dT8NONFH8myDLdf

This puzzle has confused my dad when it first came out and me since he first showed it to me.

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Anonymous 0 Comments

She asks one of them, is he going to tell me this door leads to the castle.

If answered by the liar, if the door is deadly, then the other guard will say no, but since he lies, he would answer yes.
And if the door leads to the castle, then the real answer is yes, but since he lies, he would say no.

If answered by the truth teller, if the door is deadly, the liar will lie, so he would answer yes. If the door leads to the castle, the liar will lie and the answer is no.

So if the answer is yes then the door being asked is deadly, otherwise the door leads to the castle.

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