brainteaser

This term describes a mental exercise designed to be challenging yet rewarding, often blending logic with a trick or a lateral thinking requirement. It carries a playful, recreational connotation, distinguishing it from a formal academic problem or a stressful dilemma. As a countable noun, it follows standard English pluralization rules. It is typically used in contexts involving leisure, gaming, or cognitive training, where the goal is entertainment through intellectual stimulation.