How to Add a Steam Key on Steam Deck
Easy peasy! Just open Steam on your Steam Deck, go to 'Games' in the menu, and click 'Activate a Product on Steam'. Enter your key and you're good to go!
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Just did this yesterday! Boot up your Steam Deck, go to the Library, click the '+' icon, and select 'Activate a Product on Steam'. Follow the prompts and type in your Steam key!
Don't overthink it. Open Steam, find 'Activate a Product', enter the key. Bam, new game!
No joke, it's super simple: menu > Games > Activate a Product on Steam. Done and done!
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