knotty question

sixty-four thousand dollar question vexed question

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 rebus stickler strait stumper twister

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

solution

confidence good fortune simplicity