Here is a fun puzzle for you next DND session
Before you there are two guards and in the next room over there are two doors. (Blah blah blah) one always tells the truth and one always tells lies.
BUT HERE IS THE TWIST. The one who can only lie is actively trying to point the party in the correct direction.
He will try to actively try to provide correct information through lies and deception.
Meanwhile the other one is trying to provide incorrect information through honesty and logical fallacies.
The liar: “if you were to ask me which door you should go into I would say that the door I want you to go through is the one in the left”
The honest one: “if you were to ask me which door you should go into I would say that the door I want you to go through is the one in the right”