Definition of puzzles:
(n) :
(countable) A thing such as a complicated matter or a problem which is difficult to make sense of or understand; also, a person who is difficult to make sense of or understand; an enigma.
(n) :
(countable) Often preceded by a descriptive word: a game or toy, or a problem, requiring some effort to complete or work out, which is intended as a pastime and/or to test one's mental ability.
(v) :
(transitive) (also reflexive, often passive voice) To cause (oneself or someone, or their mind, etc.) to feel confused or mystified because they cannot understand a complicated matter, a problem, etc.; to confuse, to mystify, to perplex.
(v) :
(transitive) To use (one's brain or mind) to try to work out a complicated matter, a problem, etc.; also, to try to work out (a complicated matter, a problem, etc.).
(v) :
(intransitive) Often followed by about, over, or upon: to feel confused or mystified because one cannot understand a complicated matter, a problem, etc.
(v) :
(intransitive) Often followed by about, over, or or upon: to think deeply in bewilderment to try to work out a complicated matter, a problem, etc.