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In some senses, brainteaser is marked as informal. Watch for register when choosing this word.
brainteaser
UK /ˈbɹeɪnˌtizɚ/ US /ˈbɹeɪnˌtizɚ/
noun 2
Definitions
noun
1
A problem or puzzle devised to exercise the brain and mind.
She bought me a book of brainteasers, which is both entertaining and also supposedly good for decreasing dementia risk.
2
Any difficult problem or puzzle.
Trying to figure out how to square this circle is a brainteaser to say the least.
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