Direct answer
Windows PC through Steam is the only officially listed Welcome to Elderfield platform in the collected material. The Steam page does not confirm native macOS, native Linux, PlayStation, Xbox, Nintendo Switch, iOS, or Android releases. Steam Deck and Proton have useful compatibility evidence, but that is not the same as a native Linux platform announcement.
Official updates were checked on September 29, 2026. The latest documented full-game announcement is v1.0.2a, dated September 23; the separate Demo has a v1.0.0 changelog dated September 8. Older Demo and alpha research below retains its original evidence boundaries. These announcement versions do not guarantee which build is installed on your device. Full-game, Demo, and Patreon changes are kept separate throughout the guide.
What the research confirms
The official store lists Windows system requirements and a single-player PC release. Steam Demo v0.11.17 included changes intended to improve title-movie behavior under Proton and reduce related crashes. Those notes confirm that Proton compatibility matters to the developer, but they do not create a separate Linux build.
The September 18 full-game update specifically targets Steam Deck stuttering and frame drops, with additional map-transition and menu optimizations. The developer recommends Full Screen enabled and Stretch Screen disabled for the best results. These are official recommended options, not an independently measured frame-rate guarantee.
Confirmed here means either an official source states the point directly or two independent sources agree on the same observable behavior. It does not mean every related number, location, or unlock condition is known. Exact values stay out of the confirmed section unless the collected material supports them at the same version level.
How to use this information
On a Windows PC, use the official full-game or Demo Steam page and compare your system with the listed requirements. On Steam Deck, start with the September 18 recommendation: Full Screen ON and Stretch Screen OFF. On desktop Linux, treat Proton as a compatibility layer rather than a native release, and keep saves backed up before changing compatibility tools.
Use the confirmed sequence first and check the in-game wording before committing rare materials or long sessions. Interface labels and broad mechanics are more stable than balance values, rewards, and exact routes during development. A step marked Pending verification (待确认) is a research lead, not a guaranteed instruction for the current build.
Demo, Alpha, and launch boundaries
The official August 28 Steam Deck Verified announcement confirms the certification; it is no longer supported only by a third-party database. That badge does not establish a fixed frame rate for every area or a native Linux build. Keep compatibility-layer evidence separate from a platform release announcement.
Welcome to Elderfield launched on Steam on September 10, 2026. Its public Demo and older itch or Patreon builds remain separate evidence. A detail can be authentic and still be obsolete or unavailable in another channel. Historical footage is not automatically proof of the released game's balance or unlock requirements.
Pending verification (待确认)
Console editions, native Linux, macOS, mobile ports, cross-platform save transfer, and measured Deck performance remain Pending verification (待确认). Steam Cloud is listed on the current store, but that does not prove Demo-to-full-game migration. Avoid turning community requests into confirmed ports.
Pending verification (待确认) means the collected sources did not reach the required confidence threshold. It may be supported by one guide, one developer comment, or footage whose build cannot be identified, but it lacks a matching current source. These points are retained because players search for them, while their uncertainty remains visible.
