Usage Note
Énigme refers to a mystery, a riddle, or an inscrutable person or thing. The common adjective énigmatique means 'enigmatic'. The phrase c'est une énigme pour moi is a natural way to say something is a complete mystery to you. In game contexts, résoudre une énigme means to solve a puzzle or riddle.
Examples
"Cette disparition reste une énigme pour la police."
Natural Translation
This disappearance remains an enigma for the police.

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