What is another word for brain-twister?
Pronunciation: [bɹˈe͡ɪntwˈɪstə] (IPA) 
Brain-twister is a term used to describe a challenging or perplexing problem that can be difficult to solve or understand. Some synonyms for brain-twister include puzzle, enigma, conundrum, riddle, mystery, and challenge. A puzzle is a game, toy, or problem that requires mental effort in order to be solved. An enigma is a mysterious or puzzling thing or person that is difficult to understand. A conundrum is a confusing and difficult problem or question. A riddle is a question or statement that is phrased in a way that requires ingenuity to solve. A mystery is an impossible problem to solve without information or clues. A challenge is a difficult task or situation that requires effort and determination to overcome.
