“Ok, wait, so you’re in a prison, there’s two knights guarding two doors. One always tells the truth and one always lies. One of the doors leads to your freedom, and one leads to instant death. What is the one question you ask to get to freedom? You can only ask one question to one of the knights.”
“So the answer is “Which door would the other knight say leads to freedom?” Because if you ask the knight who tells the truth, they would point to the door that leads to death because that’s the door the liar would point at, and if you ask the knight who lies, they’ll lie and say the knight who tells the truth will point at the door that leads to death. Either way, you’ll be able to figure out which one leads to freedom.”
The informant is my friend. He is a sophomore at UC Berkeley and is Jewish. He has been sharing riddles with me since high school. This information was collected during a FaceTime call.
This is a very classic riddle that embodies the concept of “multiplicity and variation.” I have heard versions of this riddle that take place at a fork in the road, in a basement, and even in space! This riddle is even featured as a part of the plot in the movie Labyrinth. Even though the setting of the riddle changes, the core stays the same. There is always one person who lies and one person who tells the truth. Additionally, no one knows where this riddle originated, which further cements this riddles place as a part of folklore.
Keartes, Sarah. “How to Beat the LABYRINTH Two-Door Riddle.” Nerdist, Geek Sundry, 14 Jan. 2016, 4:30 pm, nerdist.com/article/how-to-beat-the-labyrinth-two-door-riddle/.