Puzzle | Heaven and Hell

You are standing in front of two gates: 1) One gate leads to Heaven. 2) The other gate leads to Hell.

There are two gatekeepers:

• One always tells the truth.
• The other always lies.
• You don’t know which gatekeeper guards which gate.

What single question should you ask to guarantee finding the gate to Heaven?

Rules:

• You may ask only one question to either one of the gatekeepers.
• Based on the answer, you must determine which gate leads to Heaven.

Check if you were right - full answer with solution below. 

Solution: If I were to ask the other gatekeeper which gate leads to heaven, what would they say?

Here's how it works:

1. If you ask the truthful gatekeeper:

• They will truthfully tell you what the lying gatekeeper would say.
• The lying gatekeeper would point to Hell (because they always lie).
• So the truthful one says: "They would say that gate leads to Heaven" (but it’s actually Hell).

2. If you ask the lying gatekeeper:

• They will lie about what the truthful gatekeeper would say.
• The truthful gatekeeper would point to Heaven.
• But the liar will lie, and say the truthful one would point to Hell.

In both scenarios, regardless of who you ask, you'll receive the same answer: the gate to hell. Hence, it would be best if you chose the other gate, which is the gate to heaven.