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answer, solution

enigma, conundrum, puzzle, brainteaser, paradox, more...

great, old, unsolved, insoluble, dark, second, whole, eternal, famous, ancient, strange

wight is one,   tricky question,   picture problem,   "riddle-me- ",   cryptic clue,   beguiled question,   guess who,   engaging quation,   lack of answer,   clever questions