puzzle

nouns

a particularly baffling problem that is said to have a correct solution
"he loved to solve chessmate puzzles"; "that's a real puzzler"
a game that tests your ingenuity
is a type of (narrower)
the game equipment needed in order to play a particular game
"the child received several games for his birthday"

verbs

be a mystery or bewildering to
"This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me"
is derived from
is derived from
see also
see also
be uncertain about; think about without fully understanding or being able to decide
"We puzzled over her sudden departure"
is derived from
is a type of (narrower)
reflect deeply on a subject
"I mulled over the events of the afternoon"; "philosophers have speculated on the question of God for thousands of years"; "The scientist must stop to observe and start to excogitate"