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A riddle is a form of word puzzle designed to test someone's ingenuity in arriving at its solution.
Riddles have a distinguished literary ancestry, although the contemporary sort of conundrum that passes under the name of "riddle" may not make this obvious. Riddles occur extensively in Old English poetry, and also in the Old Norse literature of the Elder Edda and the skalds. The Exeter Book, a manuscript in Old English, preserves almost sixty versified riddles from the Old English literature. An example:
The answer called for by the poem is bookworm. The general technique is to obliquely refer to the subject by kenning and other sorts of figurative language; since kennings formed such an important element of alliterative verse forms in the Germanic languages, the riddles served the dual purpose of puzzling the poet's audience and teaching the lore needed to successfully use or understand the poetic language. The god Odin was a master of riddle lore, and sparred with several of his foes using contests of riddles. In the Vafthruthnismal, Odin defeats his foe by posing a question only he could possibly know the answer to.
The poetic form became very popular in Victorian times, when each line of a classic riddle would describe individual letters or syllables of the solution, with the last line describing the complete answer, for example,
The solution here is TEAcher.
More generally, a riddle is any puzzling question. In the Hebrew Bible, the hero Samson proposes a riddle to the Philistines, which centered around Samson's discovery of honey in the carcass of a lion. (Judges 14) In Greek mythology, riddles were the province of the Sphinx, a female monster who challenged passersby with riddles; those who failed to guess them were devoured. She famously asked Oedipus, "What is the animal that goes about on four legs in the morning, on two legs at noon, and on three in the evening?" The correct answer given by Oedipus was "Man," who crawls as a baby, walks upright as an adult, and goes with the help of a walking stick when elderly.
In J. R. R. Tolkien's The Hobbit, Gollum challenges Bilbo Baggins to a riddle competition; Bilbo wins the competition by asking Gollum, "What have I got in my pocket?", which Gollum could not answer. The answer, of course, was the One Ring, which Gollum had lost and Bilbo had since found. (Of course, many have pointed out that this is more of a "question" than a "riddle"; in the foreword to the Lord of the Rings, Tolkien pointed out that the Rules of the competition stated that Gollum had indeed lost, as he attempted to answer it instead of pointing out that it wasn't much of a riddle. By accepting it, his loss was binding.) A similarly deceptive riddling contest features prominently in Stephen King's The Dark Tower book series.
In the Batman comic books, one of the hero's best known enemies is The Riddler who is personally compelled to supply clues about his upcoming crimes to his enemies in the form of riddles and puzzles. Stereotypically, they are the kind of simple riddles as described below, but modern treatments generally prefer to have the character use more sophisticated puzzles.
Contemporary riddles typically use puns and double entendres for humorous effect, rather than to puzzle the butt of the joke, as in:
These riddles are now mostly children's humour and games rather than literary compositions.
A close relation the riddle is the trick question, which can be used to humiliate the answerer. They generally either have no good answer at all, or have a number of natural answers of which one or more can under closer scrutiny be ridiculed.
Some examples: