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35 entries under difficulty topic. ×

1
rebus(question, secret, puzzle, subtlety)
1
riddle(question, secret, puzzle, obscurity)
1
rune(question, secret, puzzle, subtlety)
1
secrecy(question, secret, puzzle, obscurity)
1
sphinx(question, secret, puzzle, obscurity)
1
stickler(question, secret, puzzle, obscurity)
1
stumper(question, secret, puzzle, obscurity)
1
subtlety(question, secret, puzzle, obscurity)
1
teaser(question, secret, puzzle, obscurity)
1
thriller(question, secret, puzzle, subtlety)
1
twister(question, secret, puzzle, obscurity)
1
whodunit(question, secret, puzzle, subtlety)
1
why(question, secret, puzzle, obscurity)
0
abstruseness(question, secret, puzzle, subtlety)
0
puzzler(question, puzzle, mystery, conundrum)
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APASmart Define. (2011). sixty-four-thousand-dollar question thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms
ChicagoSmart Define. 2011. "sixty-four-thousand-dollar question thesaurus" https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, sixty-four-thousand-dollar question thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>.
MLASmart Define. "sixty-four-thousand-dollar question thesaurus" 24 May 2011. Web. 29 September 2026. <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>