# Project Zomboid Build 42.13.0 UNSTABLE Multiplayer Released

- Product: Project Zomboid (https://whatsnew.fyi/product/project-zomboid)
- Vendor: The Indie Stone
- Date: 2025-12-11
- Original notes: https://store.steampowered.com/news/app/108600/view/648085384362721309
- Permalink: https://whatsnew.fyi/product/project-zomboid/releases/2025-12-11-build-42.13.0-unstable-multiplayer-released

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Improved target selection when aiming firearms to prioritize body parts with the head as primary target, followed by spine, pelvis, and other limbs
- **added** — Clothing and container items can now be equipped while walking
- **added** — Added new body location slot satchel for satchels, water bags, and cowboy canteens
- **changed** — Double clicking on bandages in inventory now applies them to the most damaged body part
- **added** — Double clicking on literature and map items starts the reading action if readable
- **changed** — Double clicking on containers without body location or in-hand model now equips them following hand priority rules
- **changed** — Double clicking lighters and walkie talkies equips and turns them on
- **changed** — Double clicking activatable items like flashlights equips and activates them if unequipped, or unequips and deactivates if equipped
- **changed** — Double clicking unlit candles and hurricane lanterns automatically lights and equips them if player has a lighting object
- **changed** — Double clicking boxes, bundles, and cartons unpacks them
- **changed** — Players no longer start eating food items on double click if aware they are burned, rotten, dangerous uncooked, or poisoned
- **added** — Added item icons to Destroy For Fuel and Light Fire context menus
- **added** — Multiple items can be set or unset as Unwanted when selected
- **changed** — Changed loot-window Take Same Type button from text to image to match inventory window buttons
- **changed** — Added second button to inventory window to transfer matching items to nearby containers
- **added** — Items that can be turned on or off display an (On) suffix in their display names when activated
- **changed** — Flashlights and similar items now turn off when not equipped
- **changed** — Items equipped from hotbar that are not weapons are placed in secondary slot, or primary slot if secondary is occupied
- **added** — Added item icons to Add Liquid from Item context-menu options
- **added** — Added keybind under Combat for Sharpen Weapon that performs the Sharpen Blade recipe on sharpenable items in primary hand
- **added** — Added show all recipe checkbox in handcraft panel and removed Recipe.SeeAll cheat
- **changed** — Moved Plastering, Wall Paper, and Painting options from right-click context menu to Build Menu
- **added** — Added new trait Motion Sensitive

##### FAO MODDERS

Please see the[ linked guide](https://theindiestone.com/forums/index.php?/topic/88499-modding-migration-guide-4213/) for information on how to update your mods to work with 42.13.0 and beyond, and how to make your mods MP compatible.

##### MULTIPLAYER DETAILS

The Multiplayer build is WIP for stress testing. To ensure a smoother experience and simplify bug tracking and resolution, please adhere to the following guidelines before joining a MP session:

- Disable Debug and Mods (even client ones).
- Disable Ragdoll physics.
- We strongly recommend only playing in coop or on whitelisted servers.
- We do not recommend having more than 20 player-slots on your Dedi servers for now.

##### NEW

- Improved target selection when aiming firearms. The system now prioritizes body parts, making the head the primary target, followed by the spine, pelvis, and then other limbs.

- Inventory/Object Interaction:
    - Update items that can be equipped/unequipped while walking
       -- Appropriate clothing and container items can be equipped while walking, such as hats, gloves, glasses, satchels, backpacks, etc.
       -- If a character is walking while also performing the unequip action for a clothing or container item that cannot be worn while walking then the unequip action will be cancelled.
    - Added a new body location slot, "satchel". Satchels, water bags, and cowboy canteens now all use the body location slot "satchel". Water bags and cowboy canteens previously used the ammo_strap body location. Satchels previously used the back body location.
    - Double Clicking on Items in inventory should perform non-destructive actions if appropriate.
        - Double Clicking on Bandages now applies them to an injury. If there are multiple body parts that can benefit from being bandaged, then the body part that is inflicting the most current damage will be the one that is bandaged.
        - Double-clicking on literature and map items that are in the players inventory, will, if they are supposed to be readable by the player, will start the reading actions.
        - Double clicking on containers that don't have a body location or in-hand model will still equip them. How what hand is equipped is as follow:
            -- If the secondary hand if empty then it is equipped in the secondary hand.
            -- Otherwise if the primary hand is empty then it is equipped in the primary hand.
            -- Otherwise, regardless of what already is in the secondary hand, it is equipped in the secondary hand.
        - Lighters and Walkie Talkies will be equipped and turned on when double clicked while in a character's inventory.
        - Double clicking on items in the players inventory that can be activated, such as flashlights, will equip-and-activate if unequipped, or unequip-and-deactivate in equipped.
          -- Candles and Hurricane Lanterns aren't included with this, as they don't work like Flashlights.
          -- Double clicking on unlit Candles and Hurricane Lanterns in a players inventory will, if the player has a lighting object, automatically light and equip the Candle or Lantern.
        - Double-clicking on boxes/bundles/cartons/etc of item in the players inventory will unpack them.
    - Players will no longer start eating food items on double click if the player is aware of them being hazardous to consume on account of them being burned, rotten, dangerous uncooked and also uncooked, or has poison that the player is aware of.
    - Added item icons to the "Destroy For Fuel" and "Light Fire" context menus.
    - Multiple items can be set Unwanted or unset Unwanted when selected.
    - Changed the loot-window "Take Same Type" text button to an image button, to match the inventory-windows buttons.
    - Moved the loot-window container title leftward since it overlapped the weight.
    - Added a second button to the inventory window to transfer matching items to nearby containers.
    - Context menu option will not b

_[Truncated at 4000 characters — full notes: https://store.steampowered.com/news/app/108600/view/648085384362721309]_