definitions I used when voting
brain teaser: a puzzle where you're given specific directions and then have to solve the puzzle by interacting with its elements. like having a bunch of sliding blocks which form an image when arranged in a certain order.
riddle: a word puzzle which is delivered to you by text or verbally. the solution of the riddle is answering the question, and finding the solution usually involves the manipulation of language. often the question is worded in a deceptive way that makes the solution difficult to understand, or the solution is a seemingly mundane answer which can mean something else beyond just the denotation of the word.
trick question: similar to a riddle but intentionally designed and asked in a way so that the question itself is trying to deceive the person solving the riddle. a riddle is generally solved by knowing some background information or trivia, and making connections that are not always obvious. on the other hand a trick question is solved by observation. were you paying attention to the person asking the question and did you spot the trick? if not, you'll never solve it.
