Synonyms of mind-twister

1 Syllable
sphinx, why, crux, knot
2 Syllables
sticker, stumper, twister, secret, question, puzzle, stickler, teaser, puzzler, riddle, grabber, problem
3 Syllables
cryptogram, puzzlement, conundrum, mind-boggler, parable, cliffhanger
4 Syllables
perplexity, bewilderment
5 Syllables
mystification