Definition of "brain-teaser" [brain-teaser]

• A complex riddle or puzzle. (noun)

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• "Indeed, Michael Weatherly, who plays Agent Tony DiNozzo, says the "brain-teaser, easter-egg-y... fabricated realities" will bring back characters who have long been dead."
• "Last summer's hit "life is but a dream" brain-teaser arrives on pay cable, a perfect opportunity to kick back and try to figure out what's what and what's real all over again."
• "The rise of ninjas in the tech world is being fueled in part by Amazon. com Inc., the e-commerce giant, which hosts a ninja brain-teaser contest at job fairs and industry events when hiring computer-software writers."