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Meco Rocket Simulator Early Access A rocket engine design sim with real physics. Design, build and test engines hands-on: wire pumps, injectors and nozzles on a node graph. Live graphs and 3D hardware answer every change. Learn step-by-step in 14 guided missions, or take complete control in free build. Recreate the Merlin 1D.
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 26029079
Update posts
3 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 yetPublic Builds| Build | Went live | Patch notes |
|---|---|---|
| 26029079 | None posted | |
| 25020119 | 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
Earlier Updates| Posted | Update |
|---|---|
| 14 Jan 2026 | Meco 0.4.0: Turbopumps Are Here Update |
| 23 Dec 2025 | Meco 0.3.0: Three New Missions, Better Editor Controls, and Big Stability Wins Update |
| 15 Nov 2025 | Update 0.2.0 – Mission Mode, New Propellants & Pro DLC 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
| App | Players now | Latest build |
|---|---|---|
| Meco Rocket Simulator Playtest · App 3861090 | Not yet | 25020125 · |
Separate Steam apps for test, staging and playtest versions of Meco Rocket Simulator. 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
