[Guest]

You have been locked in a dungeon with 2 doors one of which will kill you and one of which will let you live (if you walk through it) also there are 2 guards one of which tells the truth and the other tells lie (always) you can ask ONE question to ONE guard...what do you ask?

[Guest]

I could swear i have seen this on this site but i can't find it so here it is ^^.

[rookie1ja]

Welcome to the Den, Links1219955. This is probably the most repeated puzzle on this forum. I have found it in 17 threads. The first one who posts links to all 17 topics wins

You have a few minutes before I close this thread.

[Guest]

You have been locked in a dungeon with 2 doors one of which will kill you and one of which will let you live (if you walk through it) also there are 2 guards one of which tells the truth and the other tells lie (always) you can ask ONE question to ONE guard...what do you ask?

This is the riddle of the sphinx.

Which door would the other guy tell me would lead to my death?

You go through that door

[Guest]

You ask any one of the guards what the other guard would answer if you asked "which door to take?". Then you would take the opposite door based on the reply.

Assume Door 1 is right door and Door 2 is wrong.

For example, Guard A (tells truth), Guard B (tells lie). You ask Guard A which door would Guard B suggest. Guard A will tell Door 2 as he knows guard B would lie. So you take door 1. You ask Guard B which door Guard A would suggest. Guard B knows Guard A would tell truth and say Door 1 so he tells Door 2. You take Door 1 and escape.