The phrase "mind twister" is often used to describe something that is mentally challenging or puzzling. Synonyms for this phrase include brain teaser, conundrum, puzzle, enigma, riddle, mystery, and perplexity. These words all convey the idea of something that requires deep thinking and mental effort to solve. A mind twister can be an enjoyable challenge for those who enjoy using their brain power to solve problems and unravel mysteries. Whether it's a crossword puzzle, a riddle, or a complex mathematical equation, these mind twisters can provide a satisfying sense of accomplishment when finally solved.