A sci-fi colony management sim with a focus on exploration, expansion, and survival. Rebuild your underground facility, manage colonists and robots, and uncover the mysteries of an alien world light-years from Earth. Dig deep, expand across the surface, and shape your new home.

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
Build 26386556
Update posts
2 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 |
|---|---|---|
| 26386556 | Patch Version 1.21 Now Available | |
| 25652159 | 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 Oct 2026 | Mercury Fallen 1.20 Patch Notes Update |
| 30 Oct 2025 | Update 1.19 Rollback Patch notes |
| 6 Oct 2025 | Mercury Fallen Hot Fix Patch notes |
| 5 Jun 2024 | Patch Update 1.19 Update |
| 18 May 2024 | Rollback To Update 1.17 Update |
| 17 Apr 2024 |
| Patch Update 1.18 Patch notes |
| 27 Mar 2024 | Patch Update 1.18 Fix Patch notes |
| 26 Mar 2024 | Patch Update 1.18 Patch notes |
| 6 Feb 2024 | Patch Update 1.17 Patch notes |
| 1 Jan 2024 | Patch Update 1.16 Patch notes |
| 16 Dec 2023 | Patch Update 1.15 Patch notes |
| 15 Dec 2023 | Patch 1.14 (again) Patch notes |
| 15 Dec 2023 | Patch Update 1.14 Patch notes |
| 12 Dec 2023 | Patch Update 1.13 Patch notes |
| 4 Dec 2023 | Patch Update 1.12 Patch notes |
| 26 Nov 2023 | Patch 1.11 Patch notes |
| 25 Nov 2023 | Patch 1.10 Patch notes |
| 22 Nov 2023 | Patch Update 1.09 Update |
| 12 Oct 2023 | Patch Update 1.08 Patch notes |
| 9 Oct 2023 | Patch Update 1.07 Patch notes |
| 28 Sept 2023 | Patch Update 1.06 Patch notes |
| 27 Sept 2023 | Patch Update 1.05 Patch notes |
| 15 Sept 2023 | Patch Update 1.04 Patch notes |
| 4 Sept 2023 | Patch Update 1.03 Patch notes |
| 29 Aug 2023 | Patch Update 1.02 Patch notes |
| 24 Aug 2023 | Patch 1.01 Now Available Patch notes |
| 8 Jun 2023 | Update 36.7 Hot Fix 1 Patch notes |
| 6 Jun 2023 | Update 36.7 Update |
| 30 May 2023 | Update 36.6 Hot Fix 2 Patch notes |
| 30 May 2023 | 36.6 Hot Fix Patch notes |
| 29 May 2023 | Update 36.6 Update |
| 16 May 2023 | Patch Update 36.5 Patch notes |
| 12 May 2023 | Minor Update 36.4 Patch notes |
| 11 May 2023 | Minor Update 36.3 Hot Fix 1 Patch notes |
| 10 May 2023 | Minor Update 36.3 Update |
| 1 May 2023 | Minor Update 36.2 Update |
| 19 Apr 2023 | Patch Update 36.1 Patch notes |
| 18 Apr 2023 | Open Market Update Now Available Update |
| 7 Feb 2023 | Patch Update 35.6 Patch notes |
| 16 Jan 2023 | Patch Update 35.5 Patch notes |
| 6 Jan 2023 | Patch Update 35.4 Patch notes |
| 27 Dec 2022 | Patch Update 35.3 Patch notes |
| 27 Dec 2022 | Patch Update 35.2 Patch notes |
| 24 Dec 2022 | Patch Update 35.1 Patch notes |
| 7 Dec 2022 | Move It Update Now Live! Update |
| 18 Nov 2022 | Patch Update 34.1 Patch notes |
| 11 Nov 2022 | Surface Control Update Now Live! Update |
| 23 Aug 2022 | Patch Update 33.7 Patch notes |
| 5 Aug 2022 | Patch Update 33.6 Update |
| 25 Jul 2022 | Patch Update 33.5 Update |
Showing the latest 50 of 154. Show all
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