koan Synonyms

difficult proposition riddle quandary puzzle paradox mystery grabber gateway entanglement enigma embarrassment Gordian knot brain-teaser braintwister brain-twister awkward problem facer cruncher crossword Chinese puzzle chiller brainteaser cliffhanger doubt distraction dispute chaos challenge catch case bewilderment argument anagram ambiguity affair abstrusity charade complexity dilemma difficulty cryptogram crux convolution conundrum contention confusion concern complication abstruseness