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 22402341
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 |
|---|---|---|
| 22402341 | 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 |
|---|---|
| 16 Nov 2025 | Patch Notes Patch notes |
| 16 Oct 2025 | Update 1.3 — Voices in the Letters Patch notes |
| 10 Sept 2025 | ✨ New Update Available! ✨ Patch notes |
| 28 Aug 2025 | Mega Update – Twice the Content! 🌟 Update |
| 24 Jul 2025 | New Update is Live! Update |
| 16 Jul 2025 |
| Update: Rebuildable Stamps Fixes & New Features! 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
Lost Letter is a cozy incremental game about delivering lost letters, collecting over 1300 unique stamps, and exploring 113 countries. Upgrade transports, unlock boosters, and enjoy endless replayability in a relaxing collage-inspired art style.
