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.

Like any of Steam's legion of free-to-play games, demos now have a handy "Add to Library" button to tuck them away in your games list without an immediate prompt to install.