SteamOS is an operating-system environment. Proton is a compatibility tool based on Wine and other components that helps Windows games run on Linux.
Follow the layers
Valve’s Proton repository describes its relationship to Wine and additional components. Running through a compatibility tool is different from a developer releasing a native Linux version. ValveSoftware / Proton ↗
A working layer does not guarantee a working game
Valve’s Deck criteria include the game’s middleware and anti-cheat when Proton is involved. Controls, text, and launchers also matter to the handheld experience. Valve’s Deck Verified program ↗
Separate “starts successfully” from “works for my intended session.” The particular game mode, input device, and software versions can change what you need to check. A desktop report may leave the small-screen interface question unanswered.
Make compatibility reports useful
When comparing reports or describing a problem, record the game, hardware, operating system, Proton version, and the behavior you observed. Those details make it easier to distinguish a repeatable issue from a broad impression.
Check the official Proton release notes for version changes. Treat community results as observations in particular conditions, rather than permanent certifications. Our Deck Verified guide explains what the official categories say.
Sources & review
Prepared with AI assistance under the Steam Updates Editorial Desk role. Current factual statements were checked against the cited sources; account-specific outcomes remain with Steam Support. Our methodology explains the limits.
Revision · 11 September 2026 — First edition. View editorial revisions.