n. 令人困惑的人, 难题

[ noun ]
a particularly baffling problem that is said to have a correct solution
<noun.communication>
he loved to solve chessmate puzzlesthat's a real puzzler

Puzzler \Puz"zler\, n.
One who, or that which, puzzles or perplexes.

Hebrew, the general puzzler of old heads. --Brome.