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A separate Steam app for testing 
Half-Life 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
| Build | Went live |
|---|---|
| 23226171 |
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 Half-Life 2| App | Players now |
|---|---|
| KAYF-LIFE: Complete Edition | — |
| Entropy : Zero | — |
| Half-Life 2: VR Mod | — |
| The Burton Equation | — |
| A Nights Haunting: Source | — |
| DISREPAIR — A Tale Beyond Half-Life | — |
| Decay Constant | — |
| Fortress-Life | — |
| Half-Life 2 RTX | — |
| Inhuman | — |
| JBMod |
| — |
| New Times | — |
| Obsidian Conflict | — |
| Project Borealis: Prologue | — |
| Quiet Rehabilitation | — |
| SourceWorld | — |
