- Conundrum
- Riddle
- Charade
- Whodunnit
- Poser
- Cliffhanger
- Cryptogram
- Huggermugger
- Cloak and dagger
- Abstruse
- Sphinxlike
- Brain-twister
- Mindboggler
- Closed Book
- Je ne sais quoi
- Skeleton in the cupboard
- Sixty four thousand dollar question
- Tough nut to crack
- Strangeness
- Question
- Mystique
- Secrecy
- Brain-teaser
- Concealmeant
- Puzzle
- Enigma
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