We are happy to announce that in a recent update of Steam OS, Castlevania Advance Collection is now playable on Steam Deck.
Players might still encounter issues with the Music Player mode at the moment, but those may be resolved in the future with the next SteamOS updates.
We thank you for your continued support and for sharing your love for the Castlevania games.
Castlevania Advance Collection is now playable on Steam Deck !
Source: Steam Community (opens in a new tab)