brainteaser

[ breyn-tee-zer ]
/ ˈbreɪnˌti zər /

noun

a puzzle or problem whose solution requires great ingenuity.

Origin of brainteaser

First recorded in 1920–25; brain + tease + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019