Compatibility / GRAIN ROT
Steam Deck status
GRAIN ROT has no confirmed Steam Deck Verified rating. It is a Windows game with Full Controller Support, while a small, low-confidence ProtonDB sample suggests it can run through Proton.
Official Steam Deck status
GRAIN ROT does not have a confirmed Steam Deck Verified result in the sources used for this page. Steam's app data lists Windows support and does not list native Linux or macOS builds. That does not prevent Proton from running the Windows build, but it means Valve verification should not be inferred from controller support.
What Steam confirms
The store marks the game as having Full Controller Support and lists it as a Windows PC release. Full Controller Support describes the input path; it does not certify readable text, stable performance, suspend and resume, launcher behavior, or a specific frame rate on Steam Deck. Those are separate compatibility questions.
What ProtonDB reports
ProtonDB summarized seven reports as Gold with low confidence and a score of 0.49 when checked on August 15. The best individual report was Platinum, but the small set also contained conflicting experiences across patches. A Gold aggregate with low confidence is useful community evidence, not a guarantee for every Deck or current game build.
Why reports can conflict
GRAIN ROT launched recently and received several rapid patches, so a report tied to an older build can become stale quickly. Differences in Proton version, Deck model, graphics settings, multiplayer state, and saved data can also change the result. Record those details whenever you compare or submit a test.
What still needs hardware testing
A reliable current test should name Patch 1.07 or newer, Steam Deck LCD or OLED, Proton version, resolution, graphics preset, frame-rate target, and power use. It should also check controller prompts, text size, online co-op, audio, suspend and resume, and whether a saved run reloads correctly. No dedicated current Deck video was found during this research.
Practical conclusion
Treat GRAIN ROT as an unverified Windows game with promising but limited ProtonDB evidence. If you already own it, test within Steam's applicable refund window and begin with conservative graphics settings. If Steam Deck support is the deciding purchase condition, wait for a current hardware report or an official Valve rating.
Dynamic facts such as price, availability, and settings are checked against the linked source before publication. Last verified: .