Under Lock is a multiplayer asymmetrical PvP horror game for 5 players (4 survivors versus 1 monster). Take the role of a survivor with the goal to outsmart the monster and escape from lockdown. Or choose one from several unique monsters to hunt down and devour the victims.

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 12545409
Update posts
0 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 |
|---|---|---|
| 12545409 | Halloween 2023 and Alpha 10.3 |
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 |
|---|---|
| 26 Oct 2023 | Halloween 2023 and Alpha 10.3 Update |
| 22 Jun 2023 | Alpha 10.2 Patch notes |
| 10 May 2022 | HotFix Patch notes |
| 8 May 2022 | Little bug fix Patch notes |
| 25 Apr 2022 | Small update. Alpha 10 Update |
| 1 Mar 2022 |
| New Update! Random, Tips, Fixes! Update |
| 2 Jan 2022 | HotFix Patch notes |
| 28 Nov 2021 | Bugfix 7.2 Patch notes |
| 17 Nov 2021 | Bug fix 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