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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.
| Poll | Players |
|---|---|
| 18:01 UTC | 0 |
| 00:00 UTC | 0 |
| 28 Oct, 11:59 UTC | 0 |
From the Steam Web API every few hours, last checked . 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
| Build | Went live |
|---|---|
| 22165345 |
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 | 20 |
| Portal 2: Confinement | 0 |
| Portal: Forbidden Testing Tracks | — |
| Aperture: Salt Mines | — |
| GROWTH | — |
| Portal BAGLEY | — |
| Portal Versus | — |
| Portal: Divinity | — |
| Portal: Singularity Collapse | — |
| Portal: System Failure | — |
