Build 42 vs Build 41 — Complete Change List for 42.20.4

Build 42 "Expanded Crafting and Balance" ran as an unstable branch from December 17, 2024 and went stable as 42.20.0 on July 29, 2026 — followed by four successive stable hotfixes advancing to 42.20.4 on August 26, 2026. This is the consolidated change list: what's new, renamed, rebalanced, or removed versus Build 41, organized by system and updated with post-launch hotfixes. Core facts come from PZwiki's Build 42 page and skill navboxes; balance specifics from the Steam "B41 Veterans' Guide to Build 42" are marked community-reported. Checked 2026-09-05.

New skills: ten systems that didn't exist

B41 had ten skills; B42 has twenty. Verified skill list on 42.20:

New occupations follow: Blacksmith, Welder, Tailor, Rancher, Burger Flipper, and Construction Worker join the roster, and Build 42.16 ran a full occupation balance pass with further tweaks in 42.18 and 42.19.

Trait changes: added, renamed, removed

• New: Crafty (crafting XP; conflicts with Fast/Slow Learner), Mason, Inventive (recipe research), Artisan (pottery/glass), Tinkerer (+1 Maintenance), Target Shooter (+1 Aiming), Sewer, Whittler; Motion Sensitive was added mid-cycle (community-reported).
• Renamed: Wilderness Knowledge became Bushcrafter, absorbing the bow-drill fire-starting bonus that Outdoorsy lost.
• Removed (per the wiki's current markers): Lucky, Unlucky, Marksman, Patient, Brooding, Hypochondriac, Gift of the Gab, Hardened Drinker, Light Drinker.
• Rebalanced: Smoker landed at +3 (not B41's +4); Cat's Eyes and Wakeful cost more; First Aider and Iron Gut cost less; Desensitized now also grants discomfort immunity (community-reported).

Moodles: what moved on the status bar

Current moodle set adds Hyperthermia, Hypothermia, Windchill, Heavy load, Stressed, and Pain to the classic lineup. Angry and Hungover were removed; Fear, Morale, and Sanity are flagged as future work in the wiki's own navbox. Expect thermal management to matter more than it ever did in B41.

Crafting and forging: the core of the update

• Five new crafting systems: pottery, blacksmithing, stone working, brewing, and weapon crafting, each with its own workstations (furnaces, forges, anvils, kilns, grindstones, pottery wheels).
• Recipes now gate on knowledge: magazines and schematics, research from reference items, skill auto-learns, and workstation/surface requirements.
• Literature split into skill books vs recipe resources; VHS tapes expanded to Aiming, Animal Care, Blacksmithing, Electrical, First Aid, Knapping, Pottery, Tailoring, Welding (community-reported list).
• Weapon parts system: handles and heads track condition separately, blades track sharpness, and broken weapons serve as temporary options or spare parts.
• Fluid system: a global fluid registry, transfer between containers, mixed drinks and concoctions.
• A new cleaning system and double-click emergency actions arrived with the polish pass.

Animals, farming, and fishing overhauls

• Animals: first interactable animals — cows (three breeds), sheep (three breeds), chickens (two breeds), pigs, turkeys, plus wild deer, rabbits, raccoons, rats, and mice. Livestock zones, troughs, breeding genetics with dominant/recessive alleles, and Butchering as a dedicated skill.
• Farming: renamed Agriculture; 56 crops with planting seasons, bad months, curses, moon-phase health, and four diseases (see our farming guide). The disease "Devil's Water Fungi" was renamed aphids.
• Fishing: procedural fish schools reacting to noise, chum attraction, 21 new species in the data, tension minigame, and filleting moved to Butchering.
• Foraging feeds production chains: clay, flint, dogbane, limestone, fiber plants, and biome/weather-dependent finds.

Combat, health, and firearms (community-reported)

• Muscle strain limits sustained melee; heavy clothing causes discomfort tied to stress.
• Firearms: body-part damage matters more (headshots up, limb hits down); shotguns no longer grant aiming XP per pellet; jamming reduced with sandbox multipliers; .223 folded out, with the varmint-rifle side moving to 5.56 in 42.14.
• Health: pain fixes, fall-damage tuning, corpse sickness as a persistent threat — gas masks and respirators protect with draining filters; chamomile, honey, or mint hot drinks help flu recovery.

Map, zombies, and world

• Underground play: basements, bunkers, panic rooms, and taller buildings once the height limit was lifted.
• Knox Country expanded with three new towns plus borderless wilderness generation; automatic foraging zones and biomes.
• New challenge map "Many years later" for post-apocalypse crafting survival.
• Zombie population follows a generated heat map with a noise layer; fences bend and break; an option lets zombies open doors.

Loot, vehicles, and power

• Apocalypse individual loot moved 0.4 → 0.6 during unstable (42.10); loot follows place identity — police storage, ranches, themed rooms, work vehicles, safehouses, and survivor stories all carry progression now.
• Generator variants (premium, standard, loud cheap ValuTech, loudest old) with different noise and degradation; default radius 20 tiles and 3 vertical levels; fuel is a fluid — siphoning needs a hose, jerry cans hold 20 L, open containers evaporate.

42.20.0 stable patch — what changed on top of the unstable path

Build 42.20 shipped several mechanics that didn't exist in the unstable cycle and affect how you play from day one:

• "Extra Large" tree types. XL and XXL trees now generate in updated world-gen biomes. Cutting them down yields increased wood loot, and their roof-sized canopy can be hidden with right-click while driving or scouting ahead — handy before a supply run through dense forest.
• Trailer detachment. Trailers now detach when you turn too sharply or hit too much speed (see the vehicles guide for the practical warning).
• Challenge roster rotated. "Cabin in the Woods" left the rotation, replaced by "Top of the World" and "28 Minutes Later" (named "28 Seconds Later" in the announcement blog); "Winter is Coming" and "A Really CD DA" returned with corrected spawn coordinates, and respawn is now removed in "A Really CD DA".
• Sandbox ceiling raised. The "Zombie count before deletion" option's max jumped from 500 to 5,000 — population-heavy servers can spawn far more before hordes start being culled.
• Extinction rebalanced. WouldInfectionFactor went from 1.0 to 2.0 in Extinction mode — infected survivors turn twice as fast, so the mode plays noticeably harder.
• Butcher hook buff. Large animals now yield more meat cuts when using the butcher hook.
• UX additions. A disabled-by-default epilepsy warning screen on startup, repainted main-menu art (menu SFX temporarily off), and search boxes in the Discovered Recipes and Media UIs — discovered recipes sort to the top.

See the challenge modes guide for the current 42.20 roster and per-challenge tips.

42.20.1 through 42.20.4 stable hotfixes (August 2026)

Following the July 29 stable launch, four consecutive hotfixes rolled out across August 2026 to stabilize multiplayer, resolve memory issues, and tighten security. Saves remain compatible across all 42.20 minor versions:

42.20.1 (August 5, 2026) — multiplayer and memory:

• Server lag fixed for high-pop servers. Chunk-unloading performance was reworked; high-population server lag was drastically reduced.
• Vehicles no longer vanish for remaining players after another player disconnects.
• B41 worlds can no longer be hosted on B42 servers (corrupted legacy worlds are now rejected), and the missing-menu glitch when switching B41→B42 is fixed.
• Memory-leak crash fix — resolved memory leaks causing degradation and crashes over long sessions; improved memory reuse for world data.
• Mod tools gained native .json writing support.

42.20.2 (August 5, 2026) — modding and UI syntax:

• Mods must now write %% to display a % character (a temporary backwards-compatibility shim remains, but mod authors should update to avoid broken formatting in upcoming builds — see the mods guide).
• Fixed quick tips showing % as %%; added memory debug info to the FPS debug display.

42.20.3 (August 17, 2026) — 254-player servers & crash fixes:

• Server player limit raised to 254: dedicated server infrastructure was reworked to support massive populations (up to 254 concurrent players), alongside reserved administrator access slots when servers reach capacity.
• Loading Map hang resolved: fixed the game-breaking issue where players hung indefinitely on the "Loading Map" screen when joining multiplayer servers.
• World streaming optimization: addressed causes of black and gray box voids appearing when driving vehicles at high speeds or sprinting across cell borders.
• Lighting stability: fixed exceptions occurring during dynamic ambient lighting calculations.

42.20.4 (August 26, 2026) — security and Lua API changes:

• Security vulnerabilities fixed: removed loadstring and loadstream methods in the Lua sandbox to block remote execution exploits.
• Mod compatibility impact: mods using dynamic or obfuscated Lua execution (such as certain custom server anti-cheat scripts and older UI mods like CleanUI) must be updated by authors to use official commands and event channels.

Multiplayer-specific details, server configuration, and troubleshooting live in the multiplayer guide, dedicated server guide, and error fixes guide.

Engine, audio, and multiplayer

New lighting with ambient bounce, a 3D depth buffer enabling interaction with furniture from all sides, better chunk caching, adaptive soundtrack, four male and four female voice options, an official mod manager, and high-resolution UI. Multiplayer arrived mid-unstable with server-side item ownership and support for far-future "Alexandria Years" servers.

What did NOT change

Permadeath, sandbox customization, Knox County's core geography, and co-op persistence remain. The game is still Early Access — not 1.0.

Verified on 42.20.4 · Last checked 2026-09-05

Feature lists and version dates: PZwiki Build 42 page (stable July 29, 2026, version 42.20.4 August 26, 2026). Skills/traits/moodle status: current wiki navboxes. Combat/health/loot balance specifics: community-reported via the veterans' guide and may shift with hotfixes. The 42.20.0 patch section is verified against official The Indie Stone patch notes, supplemented by official 42.20.1 through 42.20.4 stable hotfix releases.