The answer to the riddle – #50 Heaven and Hell
Go up to one of the people and ask this question, “ Hello, which door that your partner will point if I ask him which way is the heaven.“ Then take the other door. Don’t enter the door that he was pointing. This question will work for both of them because if you ask this question to the truth person, he will point the hell because he knows that his partner will point hell and if you asked to the liar, he’ll still point hell because he knows that his parner will point to heaven door, so he lied. That’s why you take the other door.