puzzle

n. 1 difficult or confusing problem. 2 problem or toy designed to test knowledge or ingenuity. v. (-ling) 1 confound or disconcert mentally. 2 (usu. Foll. By over etc.) Be perplexed (about). 3 (usu. As puzzling adj.) Require much mental effort (puzzling situation). 4 (foll. By out) solve or understand by hard thought.  puzzlement n. [origin unknown]

v. Something which perplexes or embarrasses; especially, a toy or a problem contrived for testing ingenuity; also, something exhibiting marvelous skill in making.