I recently heard a version of the classic two guards (one is a knight who always tells the truth and the other is a knave who always lies) standing by two doors (one leads to certain death and the other to life) with a tiny twist that makes it much better, in my opinion, for younger audiences.
You come to a fork in the road. One path leads to a village of knaves where you will be killed and the other to a village of knights where you can live happily ever after. There are two people standing by the road, a knave from knavesville who always lies and a knight from knightsville who always tells the truth, but you do not know who is who. You can ask one of the people one question. What do you ask and what do you do?
All the answers from Two doors with two guards - one lies, one tells the truth will work here, but there is an additional answer that works in this situation that does not work in the classic telling. What I like is that this additional answer (i.e., question) does not need to have a double negative or be a multi-part question and is a rather simple question.
I think what makes it different is
that the knight is from knightsville (where you want to get) and the knave is from knavesville (where you want to avoid).