Dec 11, 2025
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Unstable 42 MP Released

5/5 Game-Changing

Multiplayer support arrives in Project Zomboid Build 42.13 alongside firearm targeting improvements and a realistic interior lighting overhaul.

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Key Changes

  • 1Multiplayer support released for Build 42 (Unstable)
  • 2Saves created before version 42.13 are no longer compatible
  • 3Improved target selection when aiming firearms
  • 4Interior lighting overhaul: light now filters through curtains and barricades
  • 5Inventory QoL: double-clicking actions and equipping while walking
  • 6Recommended Multiplayer player limit set to 20 for stress testing
  • 7Ragdoll physics temporarily disabled in Multiplayer
  • 8All mods must be disabled to ensure stability in this build
  • 9Radial Menu (RMC) re-organized with new icons
  • 10Continued improvements to Crafting and Building interactions

All Changes

👥Multiplayer(4)

  • newMultiplayer: Multiplayer support has been officially released for Build 42 (Unstable).
  • changeServers: Recommended server capacity is currently limited to 20 players for stability.
  • changeDebug Mode: Debug mode usage is discouraged in MP as it negatively impacts server performance.
  • removeRagdolls: Ragdoll functionality has been temporarily disabled in Multiplayer games.

🕹️Gameplay(2)

  • buffFirearms: Improved target selection logic when aiming firearms.
  • changeLighting: Interior lighting improved to allow light to pass through curtains and wooden barricades.

🖥️UI/UX(5)

  • buffInventory: Added double-clicking actions for faster inventory management.
  • buffInventory: Players can now equip items while walking.
  • buffInventory: Unequipped items now auto-deactivate to streamline usage.
  • changeRadial Menu: Radial Menu (RMC) interactions re-organized for better flow.
  • newRadial Menu: New icons added to the Radial Menu to streamline interactions.

🔨Crafting & Building(1)

  • buffCrafting: Continued improvements to Crafting and Building interaction systems.

⚙️Technical(2)

  • removeSave Files: Saves created before Unstable 42.13 are no longer compatible.
  • changeMods: All mods, including client-side mods, must be disabled for this build.

Summary

Multiplayer Arrival

Build 42.13 marks the first release of Multiplayer (MP) for the Unstable branch. This version is intended for stress testing and currently recommends a 20-player limit per server. Players are strongly advised to use whitelisted servers or Steam co-op and must disable all mods to ensure stability.

Gameplay & Combat

Combat receives a significant update with improved target selection logic for firearms. Additionally, the lighting system has been overhauled; interior lighting is now more realistic, allowing light to filter through curtains and wooden barricades even when they block line-of-sight.

UI & Quality of Life

Inventory management is now more fluid with the addition of double-click actions and the ability to equip items while walking. The Radial Menu (RMC) has also been streamlined with a first pass of re-organization and new icons to improve interaction speed.

Technical Warnings

This update is a breaking change for existing saves. Players must back up their data as pre-42.13 saves are no longer compatible. Furthermore, ragdoll physics have been temporarily disabled in Multiplayer modes to be re-added in a future patch.