brain-teaser

brainteaser

[breyn-tee-zer]
noun
a puzzle or problem whose solution requires great ingenuity.

Origin:
1920–25; brain + tease + er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brain-teaser or brain-twister
 
n
informal a difficult problem
 
brain-twister or brain-twister
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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