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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6 Answers

Anonymous 0 Comments

Its a classic riddle, so their’s every chance she already knew the solution.

But it goes like this:

You *know * one guard will lie, one tells the truth. The trick is to phrase the question such that you can get the same response out of both, in such a manner it highlights the liar.

When you ask a guard “what will the other guard tell me is the safe passage?”, the lair will lie, and tell that the truthful guard would say the unsafe passage.

The truthful guard will truthfully report that the liar would lie and say the unsafe passage, so whichever way round it goes, you know the safe passage is the one they DON’T say to go down.

Make sense?

Anonymous 0 Comments

By asking one of the guards what the other would say, you are guaranteed to get the WRONG answer. It removes the 50/50 uncertainty.

“Is this door safe?” “Yes.” So it must be deadly.

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.

Anonymous 0 Comments

It’s exactly like she explained. One tells the truth and the other always lies. If she asked the liar what the right path would be, they would give the wrong answer. The truth-teller would know that so they’d say that the liar would give the wrong answer.

If she asked the truth-teller what the right path is, they’d give the right answer. If she asked the liar what the truth-teller’s answer would be, they’d lie and give the wrong answer.

Either way, she can safely say that the correct path is the opposite of what they said.

Anonymous 0 Comments

All you ppl answering the question and it’s still super confusing haha.

The other question I have is – how was the path she picked the right way to the castle? She ended up in the oubliette and only escaped when Hoggle saved her (I think)?

Anonymous 0 Comments

You encounter two guards at a fork in the road. One guard always tells the truth, and the other always lies. You can ask only one question to determine which path leads to your destination. What question do you ask?