| subtlety(noun, difficulty, question, secret, puzzle) |
| difficulty(noun, trouble, issue, challenge, question) |
| inscrutability(noun, difficulty, question, secret, puzzle) |
| crux(noun, trouble, difficulty, challenge, question) |
| perplexity(noun, show, difficulty, question, secret) |
| confusion(noun, issue, question, subject, problem) |
| brainteaser(noun, difficulty, challenge, question, secret) |
| cryptogram(noun, difficulty, question, secret, puzzle) |
| labyrinth(noun, secret) |
| mystique |
| occult(noun, difficulty, question, confidence, secret) |
| puzzler(noun, show, difficulty, challenge, question) |
| show(noun, manifestation, drama) |
| stumper(noun, trouble, difficulty, challenge, question) |
| unknown(adjective, confidence, nonentity) |
| abstruseness(noun, difficulty, question, secret, puzzle) |
| obscurity(noun, complexity) |
| thriller(noun, difficulty, question, secret, puzzle) |
| art(noun, business, drama) |
| charade(noun, difficulty, question, secret, puzzle) |