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A separate Steam app for testing 
Portal 2, 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 28 Oct 2026. How we count
No public build seen yet.
From Steam’s client network, within minutes of each change. Builds from before 28 Oct 2026, when we found this app, aren’t listed. How we count
More Test Apps For Portal 2| App | Players now |
|---|---|
| Portal: Alive & Kicking | 4 |
| Portal 2: Confinement | — |
| Portal: Forbidden Testing Tracks | 0 |
| The Cleaning Game | 0 |
| Aperture: Salt Mines | — |
| GROWTH | — |
| Portal Versus | — |
| Portal: Divinity | — |
| Portal: Singularity Collapse | — |
| Portal: System Failure | — |
