User blog comment:AdorableEspurr193/If you solve this riddle, your IQ is very high/@comment-32365152-20171212195617

You ask them all "Is there an exit?'" and other obious questions. One will say there is no exit, that is the liar. One will either say there is or isn't one, that is the one that gives random answers. The one that says there is an exit is the truth teller. After you point out the liar, ask another obious question like "What is 2 + 2?."

Or you can ask them which one is which, and there will be a reapet, because the liar lies. Then you start asking questions with obious answers.