Can Steam Deck be used as a PC controller? Steam Deck microSD cards use ext4 with casefolding - Steam Deck formats SD cards to the proper format. What file system format does the microSD card use on Steam Deck? Once a game is installed on disk, you can play while Steam Deck is offline unless the game requires an internet connection. Just like a PC, you'll need to be online to download games and play online multiplayer games. How will SteamOS and Steam Deck handle offline mode when it comes to launching games? Yes, these improvements will make it to all systems using Proton. Will improvements to Proton for Steam Deck (like anti-cheat support) also apply to Proton on desktop? That is what we’re aiming for, though the rollout will happen in stages. Will the UI on Steam Deck replace Big Picture? Yes, we'll support adding games like we do for the desktop Steam client.

Will Steam on Steam Deck have an ‘Add a Game’ feature like Steam on desktop? Yes, you can run non-Steam games through Proton. Can I run non-Steam games through Proton on Steam Deck? Yes, and each account on a Steam Deck will keep its own local save data and settings. Can you have multiple Steam accounts on one Steam Deck?

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