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A separate Steam app for testing 
Serum: Toxic Survival, such as a staging branch, test server or playtest. It has no store page of its own: owners of the game get it in their library. It isn’t counted as a game or a release.
From the Steam Web API every few hours. Steam gives no count for an app nobody can launch, such as a closed playtest. We started counting on 27 Oct 2026. How we count
| Build | Went live |
|---|---|
| 14150113 |
From Steam’s client network, within minutes of each change. Builds from before 27 Oct 2026, when we found this app, aren’t listed. How we count
