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Box art for The Witcher 3: Wild Hunt
MODFORKMod / Fork or port · 2015 · REDengine 3

The Witcher 3: Wild Hunt

6 projects let you play The Witcher 3: Wild Hunt together. Here's how they compare, and which one to start with.

C
Best bet so far

Witcher Online

Rated C like W3Coop (Witcher Online for Remastered), but further along: partial, against in development. It has open source code. None of these projects is fully playable together yet.

Website ↗

Every project, side by side

Best bet so far

Witcher Online

C
RoughAlpha builds, or partial sync without the story. Expect desyncs and crashes.
Kind
MOD Mod
Stage
Partial
Co-op
56%
Synced
  • See each otherSynced
  • StoryNot synced
  • EnemiesNot synced
  • WorldPartly
  • ItemsPer player
Players say
Rate it and vote on its co-op %
Connect
Dedicated server
Players
Not stated
Tested
Player reports
Features
Open sourcePlayer reports
Latest release
No release yet
Last activity
Quiet Aug 1, 2026
GitHub stars
-
About this project

Syncs player movement, combat and appearance, emotes, chat, Gwent duels, trading, horse and boat passengers; a party syncs time, weather and dialog choices. Quests, NPCs and enemies are not synced, so players cannot fight together; the author says enemies will never be added, while the README lists NPC sync as in progress. Requires game 4.04 per its wiki. The public build (GitHub 4755ee7, 2026-08) does not run on Remastered 5.0/5.01 (Sep/Oct 2026); its full gwintManager.ws/gwintGameMenu.ws overrides declare 4.04 Gwent natives that 5.01 removed (static check, see games/witcher-3). Its WitcherNativeBridge helper (MIT) got a 5.01 update on 2026-10-08. Official server or a self-hosted Java server (UDP 40000, port forwarding). Client source GPL-3.0.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources
Project page ↗Co-op Anything write-up ↗Suggest a correction

W3Coop (Witcher Online for Remastered)

Emillock

C
RoughAlpha builds, or partial sync without the story. Expect desyncs and crashes.
Kind
FORK Fork or port
Stage
In development
Co-op
41%
Synced
  • See each otherSynced
  • StoryNot synced
  • EnemiesNot synced
  • WorldUnknown
  • ItemsPer player
Players say
Rate it and vote on its co-op %
Connect
Steam (no port forwarding)
Players
Not stated
Tested
Automated tests
Features
Easy join, no port forwardingOpen sourceAutomated tests
Latest release
v0.1.0 Oct 18, 2026
Last activity
Active Oct 18, 2026
GitHub stars
0
About this project

Port of Witcher Online to Remastered 5.01 (Steam). Client reads script strings as UTF-8, scripts moved to the 5.x API, Custom Player Characters and Chill Out replaced by stand-ins, Gwent duels off. w3relay carries the traffic over Steam (Spacewar, friends-only lobby), so nobody forwards ports. Two automated two-client tests pass on one PC (players visible, movement, also through the relay over a mock Steam); a join between two real Steam accounts, chat, emotes and party sync are untested. Pre-release v0.1.0. Port GPL-3.0, relay and harness MIT.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources
Repository ↗Co-op Anything write-up ↗Suggest a correction

w3m (momo5502)

momo5502

D
ExperimentalPrototype, research build, or abandoned before it got far.
Kind
MOD Mod
Stage
In development
Co-op
49%
Synced
  • See each otherSynced
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Dedicated server
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
No release yet
Last activity
Quiet Jun 1, 2026
GitHub stars
115
About this project

Native C++ client with its own launcher, updater and server; players connect to the server automatically when they start a game. Hooks use hardcoded addresses of a pre-remaster exe, so it cannot run on Remastered 5.x as is. Roadmap issues (sync, dedicated server, trading) are mostly open.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources
Repository ↗Co-op Anything write-up ↗Suggest a correction

WitcherMMO

eofim

D
ExperimentalPrototype, research build, or abandoned before it got far.
Kind
FORK Fork or port
Stage
In development
Co-op
29%
Synced
  • See each otherSynced
  • StoryNot synced
  • EnemiesNot synced
  • WorldPartly
  • ItemsPer player
Players say
Rate it and vote on its co-op %
Connect
Dedicated server
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
No release yet
Last activity
Active Oct 2, 2026
GitHub stars
0
About this project

Fork of Witcher Online whose only own commit (2026-10-02) renames the project. Its README lists persistent characters, NPC and monster sync and shared quests as goals, none implemented yet, so it behaves like Witcher Online 4.04.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources
Repository ↗Co-op Anything write-up ↗Suggest a correction

Witcher3-MP (Hyjarion)

Hyjarion

D
ExperimentalPrototype, research build, or abandoned before it got far.
Kind
MOD Mod
Stage
Abandoned
Co-op
30%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
v0.0.1 May 29, 2023
Last activity
Stalled May 29, 2023
GitHub stars
25
About this project

C++ project uploaded in one go on 2023-05-29 with a v0.0.1 build and a manual in the release; no later activity. AGPL-3.0.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources
Repository ↗Co-op Anything write-up ↗Suggest a correction

Witcher3-Multiplayer (werasik2aa)

werasik2aa

D
ExperimentalPrototype, research build, or abandoned before it got far.
Kind
MOD Mod
Stage
Abandoned
Co-op
58%
Synced
  • See each otherSynced
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
No release yet
Last activity
Stalled Jan 15, 2026
GitHub stars
2
About this project

WitcherScript plus an external helper fed through the -net -debugscripts channel. README claims position and rotation sync, fight sync "10%" and NPC sync "30% buggy". Last commit "DS DISCONTINUED" (2026-01-15). Witcher Online credits it. AGPL-3.0.

What you need

Your own copy of The Witcher 3: Wild Hunt.

Sources

-

Repository ↗Co-op Anything write-up ↗Suggest a correction

Know another co-op mod for The Witcher 3: Wild Hunt? Submit it.