conundrum [conundrums](difficult choice or decision) noun [UK: kə.ˈnʌn.drəm] [US: kə.ˈnən.drəm]John faces a conundrum. = John se enfrenta a un enigma.
enigma [enigmata](something puzzling, mysterious or inexplicable) noun [UK: ɪ.ˈnɪɡ.mə] [US: ə.ˈnɪɡ.mə]Mary was able to figure out the complex enigma. = Mary fue capaz de desentrañar el complejo enigma.
puzzle [puzzles](anything difficult to understand or make sense of) noun [UK: ˈpʌz.l̩] [US: ˈpʌz.l̩]