EU4 has been marked as unsupported by Steam Deck : r/eu4

Steam Deck Delivery Time 2023: US, UK, and Europe Order Shipping

Steam Deck: You Can Finally Order it in Japan

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Europa on Steam

Valve May Put Cheaper, Refurbished Steam Decks up for Sale

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NewQ Steam Deck Dock,Ultra-Slim 4-in-1 Portable Steam Deck Docking Station with HDMI 2.0 4K@60Hz, 2 USB 2.0

Tux Machines — Games: Isonzo, Steam Deck, Europa Universalis IV, More

Ben Platnick on X: Steam remote play = iron banner pinnacles on the go. / X