42.13.0|Dec 11, 2025
View on Steam↗Build 42.13.0 UNSTABLE Multiplayer Released
4/5 Significant
Build 42.13.0 introduces the highly anticipated Multiplayer stress test alongside a massive overhaul to inventory interactions, allowing players to equip clothing while walking and use double-click shortcuts for bandages and reading.
Key Changes
- 1Multiplayer stress test released for Build 42.13.0
- 2Players can now equip/unequip clothing and backpacks while walking
- 3Firearm targeting improved to prioritize headshots and spine hits
- 4Double-click shortcuts added for bandages, reading, and unpacking items
- 5New 'Motion Sensitive' trait and motion sickness mechanics for vehicles
- 6Starting gear nerfed: players no longer spawn with a pistol or ammo
- 7Ripping clothing speed increased by 60% (takes 40% of previous time)
- 8New Namespaced Resource System implemented for improved mod compatibility
- 9Claustrophobic trait now causes panic while inside vehicles
- 10Lighting system overhauled to allow light through curtains and barricades
All Changes
🌐Multiplayer(3)
- newMultiplayer: Released Build 42.13.0 Multiplayer for WIP stress testing
- changeServers: Recommended maximum player slots for dedicated servers set to 20 for stability
- changeMultiplayer: Guidelines issued to disable Debug, Mods, and Ragdoll physics for MP sessions
⚔️Combat(4)
- buffFirearms: Improved firearm target selection to prioritize the head, followed by the spine and pelvis
- newWeapons: Added 'Sharpen Weapon' keybind to quickly perform sharpening recipes on held items
- buffJawbone War Axe: Jawbone War Axe can now strike 2 targets when multi-hit is enabled
- changeFirearms: Removed distance cap for gunshots and explosions audio
🎒Inventory & Interaction(11)
- buffInventory: Enabled equipping/unequipping clothing and containers like hats, gloves, and backpacks while walking
- newSatchel: Added new 'satchel' body location slot for satchels, water bags, and canteens
- buffBandages: Double-clicking bandages now automatically applies them to the most damaged body part
- buffLiterature: Double-clicking literature or maps now automatically starts the reading action
- buffElectronic Items: Double-clicking lighters, walkie-talkies, and flashlights now equips and activates them
- buffContainers: Double-clicking boxes, bundles, or cartons now automatically unpacks them
- buffFood: Safety check added to prevent auto-eating hazardous (rotten, burned, poisonous) food on double-click
- newUI: Added image buttons for 'Take Same Type' and transferring matching items to nearby containers
- changeUI: Items now display an '(On)' suffix in their name when activated
- changeFlashlight: Flashlights now automatically turn off when unequipped
- buffInventory: Dropping items or transferring from ground to hands is now significantly faster
🔨Crafting & Building(6)
- changeBuild Menu: Moved Plastering, Wall Paper, and Painting options from context menu to the Build Menu
- newCrafting Menu: Added sub-categories and recipe groups to the Crafting Menu for better organization
- newCrafting UI: Shift + Click on input/output items in crafting UI now allows for quick searching of types or fluids
- buffTailoring: Ripping and cutting clothing recipes now take 40% of the time they previously did
- changeCrafting UI: Crafting panel is now locked by default to prevent it closing while walking
- fixBuilding: Tile building now checks for valid squares before consuming materials
🧬Traits & Survival(7)
- newTraits: Added 'Motion Sensitive' trait (-4 cost) which replaces 'Poor Passenger'
- changeVehicles: Introduced motion sickness mechanics for vehicle occupants, affected by speed, skidding, and off-roading
- nerfClaustrophobic: Claustrophobic characters now gradually gain Panic while inside a vehicle
- buffSmoking: Smoking now provides stress relief for non-smokers, with 2x relief for smokers
- nerfStarting Gear: Players no longer spawn with a pistol, magazines, or ammunition
- buffFormer Scout: Former Scout trait now grants +1 Fishing and several survivalist recipes
- buffMedical: Chamomile, Honey, and Mint now boost flu recovery when added to hot beverages
⚖️Balance(6)
- buffForaging: Added a distance bonus (up to 20 squares) for finding items in Foraging
- nerfForaging: Foraging XP is now only granted on finds, not on the pickup action
- nerfMac and Cheese: Yield from opening boxed Mac and Cheese reduced from 6 portions to 1
- buffLighter: Lighter and Disposable Lighter uses restored to more than 5
- buffLarge Bucket: Large Bucket weight tag removed and no longer considered a heavy item
- changeZombies: Horde survivor chance capped at 15
💡Lighting & Visuals(4)
- changeLighting: Disabled individual room darkening; light now passes through barricades and curtains
- newVisuals: Worn bandages now dynamically change models to a bloody version when soiled
- newAnimations: Added tying animations for building workstations and items
- buffVehicles: Adjusted vehicle physics to reduce trailer twitching
🐞Bug Fixes(5)
- fixMaintenance Skill: Fixed infinite Maintenance XP exploit using the Sharpen Blade recipe
- fixTailoring: Fixed ripping clean clothing producing dirty rags and vice versa
- fixPerformance: Fixed performance drop occurring when player-made building code ran in cells without such buildings
- fixAxe: Fixed being able to chop trees with a broken axe
- fixVehicles: Fixed vehicle horns only playing twice; restored full functionality
💻Technical & Modding(5)
- newModding: Introduced a Namespaced Resource System (ResourceLocation, Registry) for unified mod management
- changeEngine: Refactored character stats (Boredom, Intoxication, Nicotine) into a unified CharacterStat class
- newLinux: Added experimental Wayland support for Linux via JVM option
- removeEngine: Removed legacy 'Fear' stat from the engine
- removeItems: Removed Crushed Limestone, Crushed Copper, and Crushed Iron Ore; recipes now use base materials
Summary
Multiplayer & Technical
This update marks the release of the Build 42 Multiplayer stress test. It includes significant technical refactors, such as a new Namespaced Resource System for modders and the transition of character stats (Boredom, Intoxication, Nicotine) to a unified CharacterStat class. Linux users also gain experimental Wayland support.
Gameplay & Interaction
Players can now perform many actions while moving, including equipping hats, gloves, and backpacks. A new 'satchel' body slot has been added, and double-clicking items now triggers logical actions like applying bandages to the most damaged limb or unpacking bundles. Combat sees an improvement with firearm target prioritization focusing on the head and spine.
Balance & Traits
The 'Poor Passenger' trait is replaced by 'Motion Sensitive,' which ties into a new motion sickness mechanic affecting vehicle occupants based on speed and off-roading. Foraging has been rebalanced with a distance bonus for XP, while starting gear has been nerfed by removing the initial pistol and ammunition.