Dr. Square's plague took everything Lean loved. Take up your father's sword in a dark 2D action platformer: carve through the infected, survive four deadly worlds and face the doctor himself. Then build your own levels with a full editor and play them online with friends.

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 26243478
Update posts
4 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
9 hoursMiddle gap across the last 10 builds we saw
| Build | Went live | Patch notes |
|---|---|---|
| 26243478 | None posted | |
| 26170777 | None posted | |
| 26169328 | None posted | |
| 26168846 | None posted | |
| 26163886 | None posted | |
| 26142231 | None posted | |
| 26140772 | None posted | |
| 26125116 | None posted | |
| 26107174 | None posted | |
| 26097273 |
| Posted | Update |
|---|---|
| 11 Sept 2026 | Fallen Lean V43.2 — The Awaited Update Update |
| 20 Jun 2026 | Online Engine Added ! Patch notes |
| 11 Nov 2025 | Login and account creation have been added to the game. V26 Patch notes |
| 3 Nov 2025 | V21 Redeem code has been added for giveaway Patch notes |
| 6 Sept 2025 | Arabic language added the game is now fully translated. Patch notes |
| 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
| 17 Aug 2025 |
| I finally finished developing the game/ اكتملت العبة اخيرا Patch notes |
| 16 Aug 2025 | Now there is an animation of death It looks funny! Patch notes |
| 10 Aug 2025 | Now the player has animation and can talk to you. Patch notes |
| 5 Aug 2025 | New Skins Available 2.5 ! 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