A person who creates, tells, or is skilled at solving riddles and puzzles.
From 'riddle,' which comes from Old English 'rædels,' meaning to guess or interpret. The agent suffix '-er' (one who does something) was added to create 'riddler' in Middle English.
The Hobbit's Gollum is basically a riddler—Tolkien based that scene on ancient riddle contests that were actually entertainment in medieval times. People would gather to test their wit with riddles before there was TV!
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