Mine your way through a vast cave system that watches as you dig deeper each day. Explore diverse biomes, collect valuable resources and craft increasingly powerful tools and upgrades until you are strong enough to reach the end of the tunnel before it collapses on you.

Public builds
—No reading yet
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
None seen yetUpdate posts
8 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 yetNo public build seen yet.
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 |
|---|---|
| 13 Oct 2026 | Added Lore Note System + Bug Fixes Update |
| 10 Oct 2026 | Added tutorial to make equipping first tool easier Patch notes |
| 9 Oct 2026 | UI/Options Bug Fixes Patch notes |
| 8 Oct 2026 | Added mining speed entry in "more info" menu + slightly changed an upgrade Patch notes |
| 7 Oct 2026 | Major balancing bug fixes + other improvements/changes Update |
| App | Players now | Latest build |
|---|---|---|
| The Atrium Playtest · App 5220460 | Not yet | 25409829 · |
Separate Steam apps for test, staging and playtest versions of The Atrium. They have no store page, so they aren’t counted as games or releases. Builds come from Steam’s client network, players from the Steam Web API every few hours. Steam gives no count for an app nobody can launch. How we count
| 5 Oct 2026 |
| UI Improvements and bug fixes Patch notes |
| 2 Oct 2026 | Added a new cave explosive type + QOL Improvements/bug fixes Update |
| 29 Sept 2026 | Balancing patch & Bug Fixes Update |
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