puzzler

The English word “puzzler” has 5 meanings listed here.

noun

A puzzling situation or problem.
One who is mysterious.
One who devises puzzles for others to solve.
A video game in which the player is presented with (usually abstract) puzzles to solve.
A person who solves puzzles as a hobby.

From puzzle + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.