brain-twister


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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.
References in periodicals archive ?
Just for Fun offers a wide range of math puzzles, games and brain-twisters from ancient China through today's latest.
Tongue-twisters should, therefore, be renamed brain-twisters.