Operate the Starship space launch system and learn how to catch a rocket to understand what it takes to colonize Mars in this ever-evolving simulation of SpaceX Starbase Texas.

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 22133897
Update posts
1 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 |
|---|---|---|
| 22133897 | 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 |
|---|---|
| 27 Feb 2026 | New Update: Trajectory Prediciton Update |
| 12 Oct 2025 | Patch for Launch Mount Overhaul Patch notes |
| 25 Sept 2025 | New Update: Launch Mount Overhaul Update |
| 24 Aug 2025 | New Update: API, Decals, New Pad A OLM parts Update |
| 15 Jun 2025 | Patch for Starship Block 2 Update Patch notes |
| App | Players now | Latest build |
|---|---|---|
| StarbaseSim Playtest · App 3718850 | Not yet | 22117837 · |
Separate Steam apps for test, staging and playtest versions of StarbaseSim. 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
| 26 May 2025 |
| Starship Block 2 Update Update |
| 26 Mar 2025 | tiny patch to fix BQD connection issue Patch notes |
| 26 Mar 2025 | Patch for Tank Farm Update 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