Now select the game you added in the window > Add Selected Programs. Head back to your Steam library, and your non-Steam game should be available for you to play.

Add GBC Games To The Steam Deck Library With the Game Boy Color games in place, you need to add the games and their cover art to the Steam library with the Steam ROM Manager.

Click on "Add Games" and "Parse" to load your ROMs and their respective cover art. Once the games are loaded, click "Save to Steam" to add them to your Steam library. Adjust Game Settings: ...

GameNative is a new app that lets you install and play games from your Steam library directly on your Android device.