A Redditor’s reported discovery of a hidden Subnautica 2 Playtest SteamDB entry was a glimpse at closed testing, not an open invitation. The listing details appeared in a September 2025 report, months before Subnautica 2 launched in Early Access on May 14, 2026. The developer later introduced a separate opt-in Experimental branch for previewing upcoming content.
What did the Redditor reportedly find?
Notebookcheck reported on September 7, 2025, that fans had noticed a SteamDB entry named “Subnautica 2 Playtest,” identified as App ID 1962780. The outlet described the app as hidden from public view, consistent with a closed test rather than a public signup.
According to Notebookcheck’s account of the listing, it showed 280 participants four months earlier, gave July 19, 2025 as the playtest’s original release date, and showed an update on August 26, 2025. Those are historical details reported at the time; they do not establish how many people are playing now or whether the test is still running. The original Reddit post and historical SteamDB snapshot are not independently verified here, so the listing details should be understood as Notebookcheck reported them. Notebookcheck’s September 7, 2025 report
Is that playtest still open?
The 2025 report does not establish a current enrollment route or whether that specific hidden playtest remains available. A SteamDB app record is not itself an invitation, public signup, or confirmation that a test is active. It should not be confused with the game’s later Early Access release or its separate Experimental branch.
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What changed after the 2025 report?
Early Access began on May 14, 2026
Unknown Worlds announced that Subnautica 2 entered Early Access on May 14, 2026. The developer said players could explore alone or with up to three friends, and directed them to send feedback through the in-game tool or Nolt. The announcement linked to Steam, Epic Games Store, and Xbox/Microsoft Store. Unknown Worlds’ Early Access release announcement
The Experimental branch followed on August 12, 2026
Unknown Worlds later announced an opt-in Experimental branch for previewing upcoming content in an earlier state and helping the team find issues before features reach the main Early Access build. The developer warns that Experimental builds can contain bugs, including game-breaking ones. Saves are separate: progress cannot be transferred between Experimental and the main branch. Unknown Worlds’ Experimental branch announcement
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How do the playtest, Early Access, and Experimental branch differ?
| Option | What the sources establish | Access and purpose | Save compatibility |
|---|---|---|---|
| 2025 hidden playtest listing | Notebookcheck reported App ID 1962780, 280 participants four months earlier, an original release date of July 19, 2025, and an update dated August 26, 2025. | Described as hidden from public view. The report does not establish a current enrollment route or present availability. | Not stated in the cited report. |
| Main Early Access build | Unknown Worlds announced its release on May 14, 2026. | The released Early Access version; the developer described solo play and co-op with up to three friends. | Not stated in the cited release announcement. |
| Experimental branch | Unknown Worlds announced it on August 12, 2026. | Opt-in preview of upcoming content in an earlier state, used to help identify issues before features reach the main build. | Separate from the main branch; saves cannot be transferred between them. |
How can you try upcoming content now?
The developer-described preview route is the opt-in Experimental branch, not the 2025 hidden playtest listing. Because branch access instructions can change, check Unknown Worlds’ current Experimental branch announcement or the game’s current store or community page for the latest steps before opting in. Expect possible instability and keep in mind that Experimental saves do not transfer to the main branch.
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