The Two Gates Riddle

Summary

Key Points

• —The puzzle begins with a scenario where one dies and wakes up in a room with two doors, one leading to heaven and the other to hell. 0:02
• —Each door is guarded by one of two guardians: one who always tells the truth and another who always lies. 0:07
• —The correct approach requires formulating a question that works regardless of whether you ask the truth-teller or the liar. 0:07
• —If you ask the truth-teller, they will truthfully tell you that the liar would point to the door to hell. 0:07
• —If you ask the liar, they will lie about what the truth-teller would say, meaning they will also point you to the door to hell. 0:07
• —A common initial thought is to ask a question to determine which guardian is which, but this uses up the single allowed question. 0:09
• —The solution is to simply choose the door opposite to the one indicated by the guardian's answer. 0:11
• —The challenge is to ask only one question to one guardian to correctly identify the door to heaven. 0:14
• —The specific question to ask either guardian is: "If I ask the other guardian which door leads to heaven, what would they say?" 0:23
• —Therefore, no matter which guardian you ask, their answer will always direct you to the door to hell. 0:24