How to Put GOG Games on Steam Deck
First, add your GOG game to your Steam library as a non-Steam game. Open Steam, go to 'Add a Game' at the bottom left, then 'Add a Non-Steam Game,' and browse for the game's .exe file. Easy peasy!
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Use Lutris! It's a great tool for adding games from GOG and other platforms to your Steam Deck. Install Lutris, add the game there, and you're good to go!
If you wanna keep it simple, just install the game through GOG Galaxy on desktop mode, then add it to Steam using the 'Add a Non-Steam Game' option.
Just download the GOG game and add the executable to Steam. Worked for me with Witcher 3!
Honestly, why not just buy the game again on Steam? Save yourself the hassle.
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