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Play Build 42 Unstable

Project Zomboid Guide • Updated Jan 6, 2026

Project Zomboid: Playing Build 42 (Unstable)

Build 42 is the massive Next-Gen update for Zomboid, featuring animals, crafting overhaul, and basement/skyscraper tech. It is currently in **Unstable Beta**.

1. Expect Bugs

"Unstable" means exactly that. Servers may crash, save files may corrupt, and mods WILL break constantly.

2. No Going Back

Once a world is loaded in B42, it cannot be downgraded to B41. Always make a backup.

3. Mod Compatibility

99% of Workshop mods for B41 will NOT work on B42 yet. Run vanilla or only use mods explicitly marked "B42 Compatible".

How to Switch Server Version

Option 1: The Switcher (Supercraft Panel)

  1. Go to **Update / Switch Version**.
  2. Select **"Unstable"** (or `b42_beta`) from the dropdown menu.
  3. Check **"Wipe World"**. (Highly recommended for major version jumps to prevent terrain glitches).
  4. Click **Update & Restart**.

Option 2: SteamCMD (Manual)

If self-hosting, add the beta flag:

app_update 380870 -beta unstable validate

Client Instructions

You cannot join a B42 server with a B41 client.

  1. Right-Click Project Zomboid in Steam -> Properties.
  2. Go to **Betas**.
  3. Select **"unstable"** from the list.
  4. Wait for download (~3-4 GB).

Notable B42 Features to Test

  • **Animals:** Look for deer and cows in rural areas.
  • **Basements:** Try digging a cellar (requires new tools).
  • **Lighting:** The new propagation engine makes nights much darker and flashlights more realistic.

Test the future. Host your Project Zomboid server with Supercraft and easily toggle between Safe (B41) and Bleeding Edge (B42) branches.

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