Co-op horror for 1 to 6 players. Anyone can try to escape the Backrooms. You are going back in: locate the lost agents, solve the puzzles, film the entities, and hold out until extraction. Everything you carry can be lost. Your ranks, gear and storage are built to last.

Public builds
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Counted once we have watched for 90 days (since 21 Oct 2026)
Distinct builds deployed to a game's public (default) Steam branch, as Steam's client network describes them.
Checked within minutes of each Steam change. Observed since 21 Oct 2026.
Source: Steam client network (PICS), App info, public branch. Full methodology
Latest public build
Build 24601641
Update posts
9 postsPosts announcing an update, tagged or not
Posts in a game's official Steam news feed that announce an update: tagged as patch notes by the developer, or plainly about a patch or a released update.
Source: Steam Web API, ISteamNews/GetNewsForApp. Full methodology
Typical gap between builds
Not enough builds yet| Build | Went live | Patch notes |
|---|---|---|
| 24601641 | None posted |
From Steam’s client network, last checked . Builds before 21 Oct 2026, when we started watching, aren't listed. Patch notes are the developer’s update post from an hour before to a day after the build. Not every build gets one. How we count
| Posted | Update |
|---|---|
| 5 Aug 2026 | Voice Chat Overhaul • Suburbs Exit Gate Fixes Patch notes |
| 27 Jul 2026 | Performance Overhaul • Startup Fix Patch notes |
| 25 Jul 2026 | Co-op, Network & Controller Improvements • Update 0.3.503 Patch notes |
| 23 Jul 2026 | New Deployment Terminal • Endless Protocol Rework • Steam Deck Improvements Patch notes |
| 20 Jul 2026 | Xbox & PlayStation Controller Support • New Training Program • CRT Overhaul Update |
| 13 Jul 2026 | Performance & Co-op Improvements • Update 0.3.419 Patch notes |
| 12 Jul 2026 | The Found Footage Update Update |
| 4 Jul 2026 | Patch Notes 0.3.389 Patch notes |
| 8 Jun 2026 | Patch Notes 0.3.359 Patch notes |
Steam keeps no record of past build numbers, so before 21 Oct 2026 a game’s update history comes from its own Steam news: posts tagged as patch notes, and untagged posts that plainly announce a patch or a released update. Older posts are still being read in, most played games first. How we count