brain-twister

brain-twister

A puzzle or riddle that is challenging to solve. Boy, that's a real brain-twister—anyone got any ideas for what it could mean?
Farlex Dictionary of Idioms.

brain-twister

and brain-teaser
n. a puzzle, especially one that requires thinking. Can you help me with this brain-teaser? I can spend my whole vacation doing brain-twisters.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • on one's
  • on someone's
  • out of one's
  • (I've) got to go
  • #dead
  • a lulu
  • save someone's skin
  • (Have you) been OK?
  • other than
  • other than (something)
References in periodicals archive
She tosses the child numerous other puzzles and brain-twisters as she feeds the chickens or makes the bread, never missing an opportunity to make him smarter.
Tongue-twisters should, therefore, be renamed brain-twisters.