'Puzzler' definitions:

Definition of 'puzzler'

noun

A particularly baffling problem that is said to have a correct solution; "he loved to solve chessmate puzzles"; "that's a real puzzler" [syn: puzzle, puzzler, mystifier, teaser]

Definition of 'Puzzler'

From: GCIDE

Puzzler \Puz"zler\, n. One who, or that which, puzzles or perplexes. [1913 Webster]
Hebrew, the general puzzler of old heads. --Brome. [1913 Webster]

Synonyms of 'puzzler'

From: Moby Thesaurus

baffling problem,
brain twister,
Chinese puzzle,
crossword puzzle,
crux,
enigma,
enigmatic question,
floorer,
jigsaw puzzle,
knot,
knotty point,
mind-boggler,
mystery,
nut to crack,
perplexed question,
perplexity,
poser,
problem,
puzzle,
puzzlement,
question,
question mark,
sixty-four dollar question,
sticker,
stumper,
tough proposition,
vexed question,
why