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Webster 1913 Edition

Noun.

One who, or that which, puzzles or perplexes.

Hebrew, the general

puzzler

of old heads.

Brome.

Noun.

One that perplexes.

puzzler ‎(plural puzzlers)

A puzzling situation or problem; an enigma.
(video games) A video game in which the player is presented with (usually abstract) puzzles to solve.
One who solves puzzles as a hobby.
- 1927, Frederic Gregory Hartswick, Read the Pictures (page v)
  […] he commits what to a hardened puzzler seems an unforgivable sin when he uses a picture of a two-masted ship followed by HTER for the word BRIGHTER.