- One who or that which puzzles or perplexes.
- One who, or that which, puzzles or perplexes.
- A <xref>puzzling</xref> situation or problem; an <xref>enigma</xref>.
- A <xref>video game</xref> in which the player is presented with (usually abstract) <xref>puzzles</xref> to solve.
- a particularly baffling problem that is said to have a correct solution