"Horizon Zero Dawn: Complete Edition - CODEX" refers to a 2020 PC release of the game by a scene group, initially plagued by technical issues like crashes and graphical glitches that were addressed in later official updates. While this original Complete Edition was delisted in late 2024 to make way for a remastered version, it remains popular for its performance on the Steam Deck. Read the discussion on the CODEX release at Reddit . Steam Deck - Horizon Zero Dawn Remaster vs Original