brain-teaser

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brain-teaser

or

brain-twister

n
informal a difficult problem
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.brain-teaser - a difficult problembrain-teaser - a difficult problem      
problem - a question raised for consideration or solution; "our homework consisted of ten problems to solve"
References in periodicals archive ?
It's a real brain-twister, backed up by gorgeous 3D environments, cute presentation and excellent in-game physics.
The black and white humorous illustrations of Sarah Madsen add to the brain-twister tease effect of the Riddle Rhymes.
It was this sort of brain-twister that led to the invention of Limbo in the first place.