@Battlecats-t3x
"barbarian takes axe and kills first guard" "is he dead?"
@benji1901
don't ask a question, just go to one door, open it and push the guard through. If you hear screams of death then that was the danger door.
@rabbithedragon
This puzzle becomes next level when there's only 1 door 1 guard and he lies half the time but you get 3 questions to figure out weather it's currently safe to walk through the door.
@Smol_Schan
This was very helpful. Usually I can never understand this riddle, but this helped me understand it.
@kiwibaker
For those who didn't understand: Asking what door the other guard would tell me is safe, always leads to a false answer. If we ask the liar guard ¿What would the other guard say, if i asked wich door is safe? The liar guard would point to the damger door, since the other truthful guard would do the oposite. If we make the same question to the truthful guard, it would answer as the liar, and also point at the danger door. Thus, asking ¿What would the other guard say if we asked wich door is safe? always has the danger door as an answer. This way, we know wich is the danger door, and that the remaining door is the safe one :D I hope this explains it more concisely
@brigittakovacs7861
'Takes barbarian axe kills one' "Is he ded"? "No" "This one lie"
@theblackheart5727
I doubt I’ll ever wrap my head around this conundrum. Thanks a lot Ricky, Steve, and Karl.
@AdultToons
Sometimes I need shit explained to me like I'm a newborn.
@patrickrannou1278
Many D&D RPG players know this riddle. So I made the room with two undead knights, and an undead priest. The undead priest is the one presenting the riddle. So the players assume the typical two doors puzzle situation, so ask the question the "good solution" way, asking one knight what the other knight would say. If they try to ask the priest he says he doesn't know which door is the safe door. So they get a door that they "logically" think is the safe one, and go there. However, their entire premise is wholly faulty: Nothing proves to the players that the undead priest is actually telling the truth about the entire situation! In fact the 3 undeasd can say whatever they want! Both doors simply lead to more dangers, and the "good solution" of assuming the undead priest said the truth, actually leads to the worse of these two rooms. The 3 undead in the room know they can't beat the PCs directly in a fair fight, so they hope to avoid direct combat until the PCs have to start facing the threat of one of the next rooms, and then quickly arrive to attack the PCs "in their back", while they are already busy fighting! Suddenly making the fight way tougher. The only "hints" that the PCs should not believe the priest, is a previous encounter with the same type of undead knights (they all have the same heraldry symbol on their shields armor robes and vestments), to show how lying, cunning, and manipulative, such undead can be, with that 1st undead trying to befriend the PCs, offering to act as their guide to lead them to the treasure "if they then promise to bring him to a holy temple so he can be buried with the proper blessings and rituals so his soul can find peace" (a load of BS). But then he leads them straight into some deadly trap, that he activates directly himself, by pulling a secret lever, and then attacks them while insulting them for being "such stupid naive suckers". Plus 2nd hint the history analysis of their heraldic symbol reveals that that their clan of knights got cursed to undeath because they were super evil. So the "true" proper way to handle the "two doors puzzle room" is just to directly attack the 3 undead. I can make OTHER puzzles, but the 2 doors one is just so well known in the gaming community, it is better to use it as a red herring lol. Basically the big lesson is "Don't thrust monsters!"
@josephrusso4748
The key factor that you omitted is that each guard knows that the other guard will respond in the opposite way. There are actually two ways of asking this question, you can ask about the door that leads to death which will reverse your response based on a yes or no answer. So there are two ways of asking this with 8 possible scenarios.
@nagashtheforsaken
I see a lot of people not getting the riddle. Part of this is because it's horribly explained in the video. First off, the guards can't speak except to answer one question (not one question each). So the instructions to the riddle have to be given by a third party, or a message on the wall or etc. Second, this riddle involves two riddles in one, really. You have to determine which guard is lying, and which door is safe, and you only have one question. By asking either of the guards "which door would the other guard say is safe", you solve both riddles in one question. In either case, whether you ask the liar or the truthful guard, and no matter which door they guard, they will always pick the same door. So you can ask either guard the question and choose the opposite.
@Ozinarg
This riddle is wrong. You get one question total, not one question per guard. Otherwise, you could just ask gaurd number 1: "whats 2+2?" If they lie, you know the other gaurd is the truth teller, and you can safely ask them which way is safe. If they do not lie, you know the other guard is the liar, and ask them which was is safe and then do the opposite of what they say.
@Pelerin985
"Do you have your helmet on your head right now?" "No." "Thank you to be such a good liar."
@luiginishimura
When I first learned this riddle, I learned a different answer. You ask either guard 'What would you say if I asked you which door was safe?' The honest guard honestly tells you which is safe, because that's what he would say if you asked him. The lying guard will give you the right answer because he's lying about the wrong answer.
@Njorl
You can do this with one guard. State that the one guard either always lies or always tells the truth. Then ask, " If I were to ask you which door leads to safety, which door would you indicate?" Note, you are NOT asking which door leads to safety. You are asking how they would answer if they WERE asked that question. If the guard always tells the truth, then obviously he will point to the door that is safe. If the guard always lies, he will first consider what he would answer to "which door leads to safety?" If he was asked that question he would lie and indicate the unsafe door. However, to answer the question that is actually asked he has to lie about how he would answer, so he indicates the safe door.
@zg3671
Finally, after all these years, that episode of Yu-Gi-Oh now makes perfect sense to me. Ever since watching that episode I thought it was madness but alas it was shear brilliance and you explained it so simply and elegantly. Well done ✅.
@elonazazel1705
Alternatively, you can ask: “is the honest guard posted on the safe door?” And the door you pick is the one with the guard who answers “yes”. Here’s the explanation: Since one guard always tells the truth and the other always lies, their answers to that particular question will not be the same because it’s contradictory. Hence, one must says “yes” and other says “no”. If the honest guard says yes and the liar says no, then the honest guard holds the safe door as he answers the question honestly: the honest guard is indeed posted on the safe door. However, if the liar says yes and the honest guard says no, it means that the honest guard is actually not posted on the safe door because the one who says so is a liar, leaving the liar’s door to be safe. Both the scenario leads you to always pick the guard who answers “yes”, no matter he lies or tells the truth.
@Tovek
The door is a lie. You are in the safe room and the two guards are your new food source.
@NotFoundead
I can't! I really can't! People not understanding this even after the explanation just blows my mind away. It literally took me 5mins to solve this. Seems like critical thinking, following simple rules and use of logic is not a thing anymore. You can ONLY ASK 1 question to ONLY 1 of the guards. So, you ask one of the guards (doesn't matter which one) something like: "If I were to ask the other guard which door is the correct one, what would he answer?" If you ask the truth teller, he's gonna tell you the wrong door (because that's what the liar would answer). If you ask the liar, he's also gonna tell you the wrong door (because that's the opposite of what the truth teller would answer). By knowing this, you don't need to ask the question to both guards. You don't even need to know which one is which. Since the outcome is the same in both scenarios, the other door will always be the correct one. Side note: Asking for the wrong door, would also work, in that case you'd pick the same door as the guards. Literally the same, but reversed.
@thomasgrable1746