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A separate Steam app for testing 
SCP: Secret Laboratory, 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
No public build seen yet.
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
