Re: Puzzle Rooms IX
A riddle has clues that lead you to an answer, often in some sort of organized group of lines, sometimes even rhyming.
A puzzle is often mathematical, a story format, or some other sort of brain teaser that is not organized into the more poetic format of a riddle.
If it's a brain teaser, it's probably a puzzle. If it's clues to lead someone to an answer, it's probably a riddle.
The line between the two can sometimes be a little gray, but most often, it is easy to tell the difference.