烧脑

烧脑	shāo nǎo	(neologism, attested by 2016) (coll.) (of a situation, problem or piece of content) intensely demanding on the brain; brain-bending
烧	shāo	to burn; to set on fire / to heat (over a fire); to boil (water, tea etc) / to braise / to cook; to prepare food / to run a fever / fever / (coll.) to become full of oneself; to get carried away
脑	nǎo	brain / mind / head / essence