What is another word for head-scratcher?
Pronunciation: [hˈɛdskɹˈat͡ʃə] (IPA) 
A head-scratcher is an enigmatic and puzzling situation or problem that is difficult to comprehend or solve. Synonyms for head-scratcher include brain teaser, conundrum, perplexity, puzzlement, mystery, enigma, dilemma, and quandary. Brain teaser is often used to refer to a tricky riddle or puzzle that requires cognitive skills to solve, while conundrum is usually used to describe an intricate and perplexing problem. Puzzlement or perplexity is used to describe a state of confusion or bewilderment caused by an inexplicable circumstance. Similarly, a mystery or enigma refers to a perplexing and mysterious situation or phenomenon. A dilemma or quandary is a difficult choice or decision between two or more options.
