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The Sinking City 2 Steam Deck compatibility
As of August 26, 2026, Valve rates The Sinking City 2 Unsupported on Steam Deck. The current store test detail names graphics performance as the reason. This is the current first-party compatibility result, not an estimated frame-rate verdict from a community profile.
The current answer: Unsupported
Valve defines Unsupported as currently not functional on Steam Deck. The product page narrows this game's result to graphics performance. It is not a claim that every owner is unable to launch the game, but a successful launch is not evidence of a Playable or Verified experience either.
If Steam Deck is your only way to play and you need a supported experience, the evidence-safe choice is to wait for the store badge or its compatibility details to change. This page cannot promise an FPS target, a future rating, or compatibility after a particular tweak.
Use Valve's four labels precisely
These labels are categories from Valve's Deck compatibility program; they are not interchangeable with an anecdotal report that a game starts.
| Category | What the category means | The Sinking City 2 |
|---|---|---|
| Verified | Passes Valve's Deck checks and works out of the box. | Not the current result |
| Playable | Can require manual input or configuration from the player. | Not the current result |
| Unsupported | Currently not functional to Valve's Deck standard. | Current result — graphics performance |
| Unknown | Valve has not completed its compatibility review. | Not the current result |
SteamOS and Windows handhelds are different cases
Steam Deck (SteamOS and Proton)
Steam lists only Windows 11 system requirements for the game; this is not a native Linux release. Deck operation uses Valve's SteamOS compatibility path, including Proton where required. The device-specific Valve result is currently Unsupported for graphics performance.
Windows handhelds
A Deck badge does not certify a Windows handheld, and it does not by itself mark that separate device Unsupported. A handheld running Windows 11 64-bit must be judged against the official Windows requirements, its drivers, available memory and power limits. No official handheld FPS target was found in this source check.
If you already own it: test without hiding the warning
- Check the live badge first. Compatibility reviews can change after game, Proton or SteamOS updates. Confirm the current Steam product page before copying an older profile.
- Update, then start clean. Update SteamOS and the game; then leave Steam's compatibility-tool selection at its default. Avoid adding launch arguments or third-party system changes to the first run.
- Record the starting state. Note the game build, SteamOS version, default compatibility tool and in-game settings. Test menus, text, controller input and one repeatable gameplay route.
- If you continue despite the current result, change one in-game option at a time. A lower preset or resolution is an experiment, not a promise that the graphics-performance failure is fixed.
- Roll back cleanly. Restore the game's previous settings, remove any forced compatibility-tool override you added, and restart the game. Stop if input, image quality or performance remains unacceptable.
- Protect the purchase window. Valve's standard game refund offer applies to eligible Steam purchases played for less than two hours when requested within 14 days of purchase. Read the current policy and exceptions before using the whole window as a benchmark session.
Use the right page for the next decision
Windows hardware comparison
The requirements page owns the official CPU, GPU, memory, SSD and Windows targets. They are not a Deck endorsement.
Check system requirements →Desktop PC symptoms
Low FPS, stutter, blur and LOD troubleshooting belong to the Windows guide; it intentionally does not provide a Deck profile.
Open the PC settings guide →Compatibility-changing updates
Check official update history before retrying. A user workaround is not the same as a Valve rating change.
Check patch notes →Steam Deck FAQ
Is The Sinking City 2 Steam Deck Verified?
No. As of August 26, 2026, Valve gives the game an Unsupported Steam Deck result and names graphics performance as the failed check. It is neither Verified nor Playable at this source check.
Does Unsupported mean the game can never launch?
No. Unsupported is Valve's current compatibility category, not a claim that every owner is unable to launch the game. The store's specific result is about graphics performance, so a successful launch would not turn it into a supported or recommended experience.
Does the Steam Deck rating apply to Windows handhelds?
No. Deck compatibility is Valve's result for Steam Deck. A Windows handheld follows the game's Windows 11 system requirements and its own hardware and driver limits; the Deck badge neither certifies nor rejects that separate device.
What should I try if I already own it?
Update SteamOS and the game, begin with Steam's default compatibility-tool choice, record the baseline and change one in-game option at a time. Restore defaults and remove any forced tool override if the result gets worse. Keep Steam's current refund limits in mind before a long test.
Why does one Google result still say Steam Deck compatibility Unknown?
The direct Google sample on August 26 showed the current Unsupported result and a duplicate stale Unknown snippet for Steam. Search snippets can lag behind a store update, so the live Steam product page is the source of truth for the status at the time you check.
Sources: the live Steam product page and Deck test detail, Valve's Deck Verified category definitions, and the Steam refund policy. Checked August 26, 2026.