rebus

conundrum enigma problem question riddle secrecy subtlety thriller

abstruseness charade chiller cliffhanger crux cryptogram difficulty grabber inscrutability mystification occult oracle perplexity poser puzzlement rune sphinx stickler stumper teaser twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

known understanding

puzzlement

abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber inscrutability mystification occult oracle poser problem puzzle puzzler question riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

harmony

abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber inscrutability mystification occult oracle perplexity poser problem puzzle puzzlement question riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

harmony

complexity conundrum dilemma enigma mystery puzzle quandary teaser

bewilderment charade complication confusion cryptogram distraction doubt embarrassment entanglement intricacy labyrinth maze mystification perplexity plight poser predicament problem puzzlement question stickler strait stumper twister

brain-twister closed book knotty question mind-boggler sixty-four dollar question tough nut to crack tough proposition

solution

confidence good fortune simplicity