The public aquarium simulator. Design your displays, look after your fish, manage your staff and keep your guests happy! It's all in a day's work as the curator of your very own Megaquarium.

Public builds
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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 23545443
Update 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 yet| Build | Went live | Patch notes |
|---|---|---|
| 23545443 | v5.1.5 patch |
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 Jun 2026 | v5.1.5 patch Patch notes |
| 19 Apr 2026 | v5.1.4 patch Patch notes |
| 16 Apr 2026 | v5.1.3 patch Patch notes |
| 2 Apr 2026 | v5.1.2 patch Patch notes |
| 25 Mar 2026 | v5.1.0 Replay the base campaign with collection DLCs plus other improvements Update |
| 16 Mar 2026 |
| v5.0.14 patch Patch notes |
| 3 Mar 2026 | Aquarium building sim Megaquarium gets a big free update and new DLC Update |
| 25 Feb 2026 | v5.0.X patches Patch notes |
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