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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 |
|---|---|
| 30 Oct, 18:48 UTC | 1 |
| 30 Oct, 04:47 UTC | 0 |
| 29 Oct, 14:46 UTC | 0 |
| 28 Oct, 20:30 UTC | 0 |
| 28 Oct, 10:14 UTC | 1 |
| 28 Oct, 05:14 UTC | 1 |
| 28 Oct, 01:44 UTC | 1 |
| 27 Oct, 21:59 UTC | 1 |
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 27 Oct 2026. How we count
| Build | Went live |
|---|---|
| 24773560 |
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
More Test Apps For Portal 2| App | Players now |
|---|---|
| Portal: Alive & Kicking | 18 |
| Portal 2: Confinement | 0 |
| The Cleaning Game | 0 |
| Aperture: Salt Mines | — |
| GROWTH | — |
| Portal BAGLEY | — |
| Portal Versus | — |
| Portal: Divinity | — |
| Portal: Singularity Collapse | — |
| Portal: System Failure | — |
