rompecabezas
/rompekaˈbeθas/ · B2 · noun · m
jigsaw puzzle
🧩 rompe + cabezas = breaks + heads: a puzzle that breaks your head
Romper means to break, and cabezas means heads. A rompecabezas is literally a head-breaker, since solving one is so hard it seems to break your brain. The same word also covers brainteasers and riddles.