Horizon Sandbox Playtest Test app

A separate Steam app for testing Horizon Sandbox, 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.

For: Horizon Sandbox
Players now: Not counted yet
24-hour peak: —
Latest build: 29 Dec 2025, 19:44 UTC
Steam App: 4288530

Players, Last 30 Days

No player readings for Horizon Sandbox Playtest in the last 30 days yet. We poll this game every 3 hours.

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

Public Builds

Public builds of Horizon Sandbox Playtest, newest first
Build	Went live	After the one before
21338839	29 Dec 2025, 19:44 UTC	—

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

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