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Co-op directory

356 co-op projects and 44 open gaps across 252 games. Status counts: playable 76, official 13, partial 59, alpha 91, prototype 78, abandoned 39.

QA is the column that matters: it says how the claims were checked. See data/SCHEMA.md. Found something wrong or new? Edit data/directory.yaml and open a pull request, or let your agent do it (see AGENTS.md).

Projects

Game Year Engine Project Kind Status What is shared Players Net QA Last activity
(multiple) unknown HarbourMasters 64 ports (libultraship) Anchor server framework playable players visible: unknown, story: unknown, enemies: unknown, world state: partial, items: shared unknown hosted-relay player reports 2026-08
(multiple) unknown Python multiworld server with per-game clients Archipelago framework playable players visible: no, story: no, enemies: no, world state: no, items: shared unknown hosted-relay player reports 2026-10
(multiple) unknown Windows tool launching multiple game instances Nucleus Co-op framework playable players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown lan player reports 2026-10
(multiple) unknown RPCS3 PS3 emulator matchmaking RPCN emulator-netplay playable players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay player reports 2026-09
(multiple) unknown Steam streaming feature Steam Remote Play Together framework official players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 4 or more steam-relay untested unknown
(multiple) unknown Remote desktop streaming Parsec framework official players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
(multiple) unknown Dolphin emulator NetPlay Dolphin NetPlay emulator-netplay official players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports 2026-10
(multiple) unknown libretro frontend netplay RetroArch Netplay emulator-netplay official players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay player reports 2026-10
(multiple) unknown DuckStation PS1 emulator fork (GGPO rollback) DuckStation GGPO fork emulator-netplay prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2023-03
(multiple) unknown Mupen64Plus-based N64 emulator host ModLoader64 framework abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server player reports 2023-05
(multiple) unknown BizHawk Lua scripts bizhawk-co-op framework abandoned players visible: no, story: no, enemies: partial, world state: unknown, items: shared 2 or more unknown player reports 2024-06
(multiple) unknown Windows DLL injection tool Universal Split Screen framework abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown lan untested 2022-12
(multiple) unknown Mupen64Plus based N64 emulator simple64 netplay emulator-netplay abandoned players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay untested 2025-02
(multiple) unknown PCSX2 PS2 emulator fork pcsx2-online emulator-netplay abandoned players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2019-10
A Difficult Game About Climbing 2024 Unity 2021.3 (Mono) ADGAC Co-op mod prototype players visible: yes, world state: no 2-4 steam-relay untested 2026-10
Alien: Isolation 2014 Creative Assembly proprietary AI co-op (build from zero, this fork) mod alpha players visible: yes, story: no, enemies: no, world state: no, items: per-player 2 direct-ip automated tests 2026-10
Alien: Isolation 2014 Creative Assembly proprietary Alien Isolation co-op (Dropper7894) mod prototype story: no, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Animal Crossing (GameCube) 2001 GameCube decompilation native PC port (ac-decomp, OpenGL 3.3) ACGC-PC-Multiplayer decomp-port partial players visible: yes, story: unknown, enemies: unknown, world state: yes, items: unknown unknown dedicated-server untested 2026-10
Arx Fatalis 2002 Arx Libertatis arx-fatalis-coop (kingzmanh) fork alpha story: yes, enemies: unknown, world state: unknown, items: unknown 2 vpn-needed untested 2026-09
Arx Fatalis 2002 Arx Libertatis ArxCoop (Parricidium) fork alpha story: unknown, enemies: unknown, world state: unknown, items: unknown 2-4 vpn-needed untested 2026-09
Atomic Heart 2023 Unreal Engine 4 Atomic Heart Ghost Co-op mod prototype players visible: yes, story: no, enemies: no, world state: no, items: no up to 8 (including the host) unknown untested 2026-10
Autonauts 2019 Unity AutonautsCoop mod playable players visible: yes, story: yes, enemies: unknown, world state: yes, items: shared 2-8 steam-relay automated tests 2026-10
Balatro 2024 LÖVE 11 (Lua, LuaJIT) Balatro Duo mod playable players visible: partial, story: partial, enemies: yes, world state: partial, items: per-player 2 lan automated tests 2026-10
Balatro 2024 LÖVE 11 (Lua, LuaJIT) BalatroCoop mod alpha players visible: partial, story: yes, enemies: yes, world state: yes, items: shared 2 lan untested 2026-10
Baldi's Basics Plus 2020 Unity 2020.3.49f1 (Mono) Baldi Together mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player 2-4 steam-relay automated tests 2026-10
Baldur's Gate 1998 Infinity Engine Official multiplayer (original and Enhanced Edition) official official story: unknown, enemies: unknown, world state: unknown, items: unknown 6 direct-ip untested unknown
Banjo-Kazooie 1998 N64 decompilation port (Lighthouse, libultraship) Lighthouse (Anchor multiplayer) decomp-port playable players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay untested 2026-10
Banjo-Kazooie 1998 N64 static recompilation (Banjo: Recompiled) BK64-Online mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: shared 2 hosted-relay untested 2026-07
Banjo-Kazooie 1998 N64 static recompilation (Banjo: Recompiled) BanjoCoop mod prototype players visible: yes, story: partial, enemies: unknown, world state: yes, items: shared unknown unknown untested 2026-08
Banjo-Kazooie: Nuts & Bolts 2008 Xbox 360 emulated in Xenia NB-Multiplayer mod partial players visible: yes, story: unknown, enemies: unknown, world state: partial, items: unknown up to 4 online matches steam-relay untested 2026-10
Batman: Arkham Knight 2015 Unreal Engine 3 Arkham Knight Co-op (SplitScreen) mod partial story: partial, enemies: yes, world state: yes, items: unknown 2-4 lan untested 2026-10
Batman: Arkham Knight 2015 Unreal Engine 3 Nightfall Together mod alpha story: partial, enemies: yes, world state: yes, items: unknown 2-4 steam-relay untested unknown
BattleTech 2018 Unity battletech-coop mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: shared 2+ steam-relay automated tests 2026-10
BattleTech 2018 Unity BattleTech Co-op (Co-op Anything Discord) mod prototype ? unknown unknown untested 2026-10
BioShock Remastered 2016 Unreal Engine 2.5/3 BioShock Together mod alpha players visible: yes, story: yes, enemies: yes, world state: partial, items: partial 2 direct-ip untested 2026-10
Black Myth: Wukong 2024 Unreal Engine 5 WukongMP mod alpha story: unknown, enemies: unknown, world state: unknown, items: unknown up to 10 co-op hosted-relay untested 2026-08
BLACK SOULS II 2018 RPG Maker VX Ace BS2 Coop mod alpha players visible: yes, story: yes, enemies: partial, world state: yes, items: per-player 2-4 vpn-needed automated tests 2026-10
Call of Duty: Black Ops III 2015 IW engine (Call of Duty, Treyarch fork) BO3 4-Player Local Splitscreen on PC mod partial players visible: yes, story: unknown, enemies: yes, world state: yes, items: per-player 2-4 ? player reports 2026-10
Call of Duty: Modern Warfare 2 2009 IW 4.0 (Call of Duty) mw2_coop mod partial players visible: yes, story: partial, enemies: yes, world state: yes, items: per-player 2 direct-ip automated tests 2026-10
Call of Duty: Modern Warfare 2 2009 IW 4.0 (Call of Duty) COD-MOD campaign co-op pack (iw4sp_codmod) mod abandoned players visible: yes, story: partial, enemies: unknown, world state: unknown, items: unknown 2 direct-ip player reports 2021-10
Call of Duty: Modern Warfare 3 2011 IW 5.0 (Call of Duty) AlterWare IW5-Mod mod partial story: no, enemies: unknown, world state: unknown, items: unknown 2 unknown untested 2026-10
Celeste 2018 XNA/FNA CelesteNet mod playable players visible: yes, story: no, enemies: no, world state: no, items: per-player unknown hosted-relay player reports 2026-06
Celeste 2018 XNA/FNA Co-op Helper mod playable players visible: yes, story: no, enemies: unknown, world state: partial, items: partial unknown hosted-relay player reports 2026-09
Celeste 2018 XNA/FNA Partnership mod playable players visible: yes, story: partial, enemies: unknown, world state: partial, items: per-player 2 hosted-relay player reports 2022-01
Celeste 2018 XNA/FNA Intertwined mod playable players visible: yes, story: no, enemies: unknown, world state: partial, items: per-player 2 hosted-relay player reports 2026-10
Clair Obscur: Expedition 33 2025 Unreal Engine 5 Expedition 33 local co-op (JINX) mod partial story: partial, enemies: yes, world state: partial, items: per-player up to 3 lan untested unknown
Clive Barker's Jericho 2007 MercurySteam ScrapEngine (Scrapland engine, Lua 5.1) Jericho Co-op+ mod alpha players visible: yes, story: yes, enemies: yes, world state: partial, items: unknown 2-4 direct-ip automated tests 2026-11
Code Vein 2019 Unreal Engine 4 Nexus mod 192 ("co-op mod") mod partial players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 2 steam-relay player reports 2020
Code Vein 2019 Unreal Engine 4 codevein-coop (CoopSeamless, CoopProbe, CoopNative; work in progress) mod prototype players visible: yes, story: unknown, enemies: yes, world state: unknown, items: per-player 2 steam-relay untested 2026-10
Command & Conquer 3 Tiberium Wars 2007 SAGE (C&C3 era) Campaign co-op prototype (dinput8 proxy) mod prototype players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2 hosted-relay player reports 2026-10
Crab Champions ? Unreal Engine 5 CrabSync mod playable players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: shared as the base game's online lobby unknown untested 2026-10
Crash Team Racing 1999 PS1 in DuckStation (patched disc) OnlineCTR mod playable players visible: yes, story: no, enemies: no, world state: no, items: no up to 8 dedicated-server player reports 2026-10
Crime Scene Cleaner 2024 Unity (IL2CPP) Crime Scene Cleaner Co-op mod playable players visible: yes, story: yes, enemies: unknown, world state: yes, items: shared 2 steam-relay automated tests 2026-10
Crimson Desert 2026 BlackSpace Engine Crimson Desert Multiplayer (cdmp) (up for adoption) mod alpha players visible: yes, story: no, enemies: partial, world state: no, items: per-player 2 steam-relay untested 2026-10
Crimson Desert 2026 BlackSpace Engine CrimsonDesertCoop (blizz3010) mod prototype players visible: yes, story: no, enemies: partial, world state: no, items: unknown 2 steam-relay untested 2026-07
Crimson Desert 2026 BlackSpace Engine (unnamed, by No-Context2224) mod prototype players visible: yes, story: unknown, enemies: partial, world state: unknown, items: unknown 2 unknown untested 2026-10
Crysis 2007 CryEngine 2 Crysis Co-op mod playable story: yes, enemies: unknown, world state: unknown, items: unknown unknown steam-relay player reports 2019-11
Crysis 2007 CryEngine 2 crysis-coop (SeniorStackOverflow) mod alpha story: yes, enemies: yes, world state: unknown, items: unknown 2-4 hosted-relay untested 2026-10
Cult of the Lamb 2022 Unity Cult of the Lamb Co-op Anything mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: partial unknown unknown automated tests 2026-10
Cuphead 2017 Unity 2017.4 (Mono) CupHeads mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2 steam-relay untested 2026-10
Cuphead 2017 Unity 2017.4 (Mono) CupHeads (Multiplayer Everything fork) fork alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2 steam-relay automated tests 2026-10
Cyberpunk 2077 2020 REDengine 4 CyberpunkMP (Tilted) framework alpha story: no, enemies: unknown, world state: partial, items: unknown unknown dedicated-server untested 2024-12
Cyberpunk 2077 2020 REDengine 4 oxylol/cp2077-coop (story co-op fork of CyberpunkMP) fork alpha story: partial, enemies: unknown, world state: partial, items: unknown unknown unknown untested 2026-10
Cyberpunk 2077 2020 REDengine 4 NightCoop mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player up to 8 hosted-relay untested 2026-10
Cyberpunk 2077 2020 REDengine 4 NightCityMP fork alpha players visible: yes, story: no, enemies: no, world state: no, items: unknown unknown direct-ip untested 2026-07
Cyberpunk 2077 2020 REDengine 4 OPEN//77 framework alpha players visible: yes, story: no, enemies: yes, world state: partial, items: unknown unknown dedicated-server untested 2026-10
Cyberpunk 2077 2020 REDengine 4 CyberMP mod prototype story: no, enemies: unknown, world state: unknown, items: unknown 30-40 tested dedicated-server untested 2026-06
Cyberpunk 2077 2020 REDengine 4 KyleBuildsAI/cp2077-coop mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown 2 hosted-relay automated tests 2026-10
Cyberpunk 2077 2020 REDengine 4 Bukczyk/CP2077-Coop (session foundation) mod prototype players visible: yes, story: no, enemies: partial, world state: no, items: unknown 2 lan untested 2026-10
Cyberpunk 2077 2020 REDengine 4 RedSync mod prototype players visible: yes, story: partial, enemies: partial, world state: unknown, items: unknown unknown dedicated-server untested 2026-08
Cyberpunk 2077 2020 REDengine 4 Chaoskjell/Coop-Cyberpunk-Mod mod prototype players visible: unknown, story: no, enemies: no, world state: no, items: unknown 2 unknown untested 2026-08
Dark Messiah of Might and Magic 2006 Source Dark Messiah Co-op Mod (wiltOS) mod alpha story: partial, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay player reports 2026-03
Dark Souls III 2016 FromSoftware proprietary Dark Souls III Seamless Co-op mod alpha story: yes, enemies: yes, world state: yes, items: per-player 2-6 steam-relay player reports unknown
Dark Souls Remastered 2018 FromSoftware proprietary Dark Souls Remastered Seamless Co-op mod playable story: yes, enemies: yes, world state: yes, items: per-player 2-6 steam-relay player reports 2025-04
Dave the Diver 2023 Unity Daves the Divers (local co-op) mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: partial 2 ? automated tests 2026-10
Dave the Diver 2023 Unity Coop-Divers (DaveTheDiverMP) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: partial unknown direct-ip untested 2026-07
Dave the Diver 2023 Unity 6000.0 (IL2CPP) Dave the Diver Multiplayer (Coop-Divers fork) fork alpha players visible: yes, story: partial, enemies: partial, world state: yes, items: partial 2 steam-relay automated tests 2026-10
Dave the Diver 2023 Unity Dave the Diver Co-op Setup (FireTva) mod prototype players visible: partial, story: no, enemies: unknown, world state: no, items: unknown 2 unknown untested 2026-10
Dead Cells 2018 Haxe / HashLink (Heaps) Dead Cells Local Co-op mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: per-player 2 lan untested 2026-10
Dead Cells 2018 Haxe / HashLink (Heaps) DeadCellsMultiplayerMod mod alpha players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown steam-relay untested 2026-10
Deep Rock Galactic: Survivor 2024 Unity 6 (IL2CPP) drg-survivor-local-coop mod playable players visible: yes, enemies: yes, world state: yes, items: per-player 2 unknown automated tests 2026-10
Deus Ex 2000 Unreal Engine 1 dxhx-coop-server framework playable story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2024-11
Deus Ex 2000 Unreal Engine 1 HX + HXFix + HXCoop (deus-ex-coop) mod playable story: yes, enemies: yes, world state: yes, items: per-player 2-8 steam-relay automated tests 2026-10
Deus Ex 2000 Unreal Engine 1 HX mod partial story: yes, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server player reports 2019-06
Deus Ex 2000 Unreal Engine 1 RolePlay Coop mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Deus Ex 2000 Unreal Engine 1 ue-deus-ex-coop mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2014-08
Diablo 1996 DevilutionX DevilutionX multiplayer (ZeroTier) decomp-port playable story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay player reports 2026-10
Dishonored 2012 Unreal Engine 3 (modified) Dishonored COOP mod (J.P) mod partial story: partial, enemies: unknown, world state: unknown, items: unknown 2 steam-relay player reports 2026-09
Dishonored 2012 Unreal Engine 3 (modified) dismod mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested unknown
Dishonored 2 2016 Void Engine Dishonored 2 COOP mod (ZikQ) mod alpha story: partial, enemies: unknown, world state: unknown, items: unknown 2 vpn-needed untested unknown
Divinity II: Developer's Cut ? Gamebryo-derived (Larian "Divinity Application") divinity2-split-screen framework prototype players visible: no, story: no, enemies: no, world state: no, items: no 2 (planned) unknown automated tests 2026-10
Donkey Kong 64 1999 N64 emulation via ModLoader64 Dk64Online mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2022-10
Doom 3 2004 id Tech 4 LibreCoop (dhewm3) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-01
Doom 3 2004 id Tech 4 OpenCoop mod partial story: yes, enemies: unknown, world state: unknown, items: unknown 4 direct-ip player reports unknown
DOOM Eternal 2020 id Tech 7 Co-operative Mode mod playable story: partial, enemies: yes, world state: unknown, items: unknown 2-3 steam-relay player reports unknown
Dragon Age: Origins 2009 Eclipse Engine dao-coop mod alpha players visible: yes, story: no, enemies: partial, world state: no, items: no 2 lan automated tests 2026-10
Dragon's Dogma 2 2024 RE Engine DD2gether mod alpha story: unknown, enemies: yes, world state: yes, items: unknown up to 4 steam-relay untested 2026-08
Duke Nukem 3D 1996 Build engine (EDuke32) Duke Nukem 3D Split-Screen mod playable story: unknown, enemies: unknown, world state: unknown, items: unknown 2-4 lan untested unknown
Dungeon Keeper 1997 KeeperFX Dungeon Keeper Co-op (shared keeper, coop-anything) fork alpha story: yes, enemies: yes, world state: yes, items: shared 2-4 steam-relay automated tests 2026-10
Dungeon Keeper 1997 KeeperFX KeeperFX Archon mode (shared keeper) fork prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-10
Dungeon Keeper 2 1999 Flame patch loader DK2 Co-op mod playable story: yes, enemies: yes, world state: yes, items: yes 2 direct-ip untested 2026-10
Dynasty Warriors 3: Complete Edition Remastered 2026 Unreal Engine 5 Official split-screen co-op (shipped) and online co-op (free update announced) official official players visible: yes, story: yes, enemies: yes, world state: yes, items: unknown 2 unknown untested 2026-09
Elden Ring 2022 FromSoftware proprietary Seamless Co-op mod playable story: yes, enemies: yes, world state: yes, items: per-player 2-6 steam-relay player reports unknown
Elden Ring Nightreign 2025 FromSoftware proprietary Nightreign Seamless Co-op mod playable story: unknown, enemies: yes, world state: yes, items: per-player 1-6 steam-relay player reports unknown
Enter the Gungeon 2016 Unity 2017.4 (Mono) Gungeon Online mod playable players visible: yes, story: partial, enemies: partial, world state: yes, items: partial 2 lan automated tests 2026-10
Enter the Gungeon 2016 Unity 2017.4 (Mono) GungeonTogether 3-Player mod prototype players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 3+ steam-relay untested 2026-10
F.E.A.R. 2005 Jupiter EX (LithTech) F.E.A.R. Cooperative mod playable story: yes, enemies: unknown, world state: unknown, items: unknown 16 direct-ip player reports unknown
F.E.A.R. 2005 Jupiter EX (LithTech) fearservmod (multiplayer fixes with coop mode) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-01
Fallout 1997 Fallout CE (fallout1-ce) fallout1-coop fork partial story: unknown, enemies: unknown, world state: unknown, items: unknown 2 direct-ip untested 2026-10
Fallout 1997 Fallout CE (fallout1-ce) fallout1-companion-coop fork alpha story: unknown, enemies: unknown, world state: unknown, items: unknown 2 direct-ip untested 2026-10
Fallout 2 1998 Fallout 2 CE fallout2-ce-coop fork partial story: partial, enemies: yes, world state: yes, items: per-player unknown dedicated-server untested 2026-08
Fallout 3 2008 Gamebryo VaultMP mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2021-06
Fallout 4 2015 Creation Engine Fallout Together mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-04
Fallout 4 2015 Creation Engine F4MP mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Fallout Tactics: Brotherhood of Steel 2001 Proprietary (Micro Forte) fallout-tactics-coop mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: yes 2-4 direct-ip automated tests 2026-10
Fallout: New Vegas 2010 Gamebryo NV:MP mod playable players visible: yes, story: no, enemies: yes, world state: partial, items: unknown 4 direct-ip player reports 2026-10
Fallout: New Vegas 2010 Gamebryo fnv-coop framework prototype players visible: partial, story: partial, enemies: unknown, world state: partial, items: unknown 2-4 direct-ip automated tests 2026-10
Far Cry 2004 CryEngine 1 Assault Coop mod partial story: partial, enemies: partial, world state: unknown, items: unknown unknown lan player reports 2011
Far Cry 2004 CryEngine 1 FarCryCoop mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player 2-4 direct-ip untested 2026-10
Far Cry 2004 CryEngine 1 Far Cry Advanced Version (FCAV) mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-05
Far Cry 2 2008 Dunia (CryEngine 1 derivative) fc2-coop-probe (position puppet, research prototype) mod prototype players visible: partial, story: no, enemies: no, world state: no, items: no 2 (two PCs over Steam, or two copies on one PC) steam-relay automated tests 2026-10
Far Cry 3 2012 Dunia Open World Co-op Mod (scubrah) mod partial story: no, enemies: partial, world state: partial, items: unknown unknown unknown player reports unknown
Far Cry 4 2014 Dunia Campaign Co-op mod partial story: partial, enemies: unknown, world state: unknown, items: unknown 2 unknown player reports unknown
Fear & Hunger 2020 RPG Maker MV Fear & Hunger Together mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: per-player 2-4 hosted-relay automated tests 2026-10
FEZ 2012 XNA (HAT/MonoMod mod loader) FezMultiplayerMod mod partial players visible: yes, story: no, enemies: unknown, world state: no, items: unknown unknown dedicated-server untested 2026-10
Final Fantasy VII Remake Intergrade 2021 Unreal Engine 4 Final Fantasy VII Remake and Rebirth Co-op (Co-op Anything Discord) mod prototype ? unknown unknown untested 2026-10
Forager 2019 GameMaker Studio 2 (YYC) Forager Co-op Mod mod playable players visible: yes, story: partial, enemies: yes, world state: yes, items: per-player 2-4 steam-relay automated tests 2026-10
Gedonia 2022 Unity 2019.4 (Mono) Gedonia Co-op mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: per-player 2-4 steam-relay automated tests 2026-10
Genesis Alpha One 2019 Unreal Engine 4 genesis-alpha-one-coop mod prototype players visible: partial, story: no, enemies: unknown, world state: partial, items: no 2 direct-ip untested 2026-10
GoldenEye 007 1997 N64 decompilation (goldeneye_src) fork GoldenEye 007 Plus fork partial players visible: unknown, story: partial, enemies: unknown, world state: unknown, items: partial 1-4 unknown untested 2026-10
Gothic / Gothic II 2001 ZenGin Gothic Coop (Union plugin) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown vpn-needed untested 2026-02
Gothic 1 Remake unknown Unreal Engine 5.4 Gothic 1 Remake Coop mod prototype players visible: yes, story: no, enemies: no, world state: no, items: no 2 direct-ip untested 2026-10
Gothic 3 2006 Genome G3 Together mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: yes 2 direct-ip automated tests 2026-10
Gothic 3 2006 Genome Gothic 3 Multiplayer (Cooperation mode) mod alpha story: unknown, enemies: unknown, world state: unknown, items: unknown unknown direct-ip player reports 2024-04
Gothic 3 2006 Genome Gothic 3 Heroes mod alpha players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports 2026-09
Gothic 3 2006 Genome Myrtana Accord mod alpha players visible: no, story: partial, enemies: no, world state: unknown, items: unknown unknown vpn-needed automated tests 2026-09
Gothic II: Night of the Raven 2003 ZenGin Gothic Multiplayer (GMP) / Gothic Online mod partial story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server player reports 2026-01
Grand Theft Auto IV 2008 RAGE Coop Missions (Mission Loader) mod abandoned story: partial, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Grand Theft Auto IV 2008 RAGE IV:MP and IV-Network (multiplayer replacements) mod abandoned story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2016-10
Grand Theft Auto V 2015 RAGE RAGECOOP mod partial story: partial, enemies: unknown, world state: partial, items: unknown unknown dedicated-server player reports unknown
Grand Theft Auto: San Andreas 2004 RenderWare Player 2 - Drop In, Drop Out (CLEO) and 2 Player Missions Loader mod playable story: yes, enemies: unknown, world state: unknown, items: unknown 2 lan untested unknown
Grand Theft Auto: San Andreas 2004 RenderWare SA-MP / MTA (free-roam multiplayer) mod playable story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server player reports unknown
Grand Theft Auto: San Andreas 2004 RenderWare SA:COOP mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: partial 2 unknown untested 2026-10
Grand Theft Auto: San Andreas 2004 RenderWare CoopAndreas mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: unknown unknown dedicated-server untested 2026-10
Grand Theft Auto: San Andreas 2004 RenderWare SACoop mod prototype story: no, enemies: no, world state: no, items: no 2-4 unknown untested 2026-10
Grand Theft Auto: San Andreas 2004 RenderWare GTA SA Open Co-Op mod prototype story: partial, enemies: partial, world state: unknown, items: unknown unknown dedicated-server untested unknown
Grand Theft Auto: Vice City 2002 RenderWare Vice City Multiplayer (VC-MP) mod playable story: no, enemies: unknown, world state: unknown, items: unknown 100 dedicated-server player reports 2025-11
Graveyard Keeper 2018 Unity 2020.3 (Mono) Back From The Grave mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: per-player 2 steam-relay automated tests 2026-09
Graveyard Keeper 2018 Unity 2020.3 (Mono) graveyard-keeper-multiplayer mod alpha players visible: yes, story: no, enemies: no, world state: partial, items: per-player 2 steam-relay player reports 2026-09
Hades 2020 Supergiant proprietary Local Co-op multiplayer for Hades mod playable story: unknown, enemies: yes, world state: yes, items: partial 2 lan player reports unknown
Hades 2020 Supergiant proprietary Hades Multiplayer (COOP Anything inspired) mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: shared 1-4 ? untested 2026-10
Hades II 2025 Supergiant proprietary Hades II Local Co-op (TheNormalnij) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown 2 lan untested unknown
Half Sword ? Unreal Engine 5 Half Sword Multiplayer Mod (HSMMod) mod prototype players visible: yes, story: no, enemies: unknown, world state: partial, items: per-player up to 6 steam-relay untested 2026-10
Half-Life 1998 GoldSrc Sven Co-op mod playable story: yes, enemies: yes, world state: unknown, items: unknown unknown dedicated-server player reports unknown
Half-Life 2 2004 Source Synergy mod playable story: yes, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server player reports unknown
Half-Life 2 2004 Source Lambda Fortress mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Half-Life 2 2004 Source Obsidian Conflict mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested unknown
Half-Life: Alyx 2020 Source 2 Half-Life: Alyx Co-op (Co-op Anything Discord) mod prototype players visible: yes, enemies: partial, world state: partial unknown unknown untested 2026-10
Halo: Combat Evolved 2001 Halo Custom Edition 1.0.10 Coop Evolved mod playable players visible: yes, story: partial, enemies: partial, world state: unknown, items: unknown up to 16 dedicated-server player reports 2026-06
Hexen: Beyond Heretic 1995 Doom engine HexenCoop script and Zandronum Hexen coop patch mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-01
Hogwarts Legacy 2023 Unreal Engine 4 Wandrealm mod playable story: no, enemies: unknown, world state: partial, items: per-player up to 512 per realm dedicated-server player reports 2026-10
Hogwarts Legacy 2023 Unreal Engine 4 HogWarp mod abandoned story: no, enemies: unknown, world state: unknown, items: unknown up to 8 planned dedicated-server untested 2023-07
Hollow Knight 2017 Unity HKMP mod playable story: no, enemies: unknown, world state: no, items: per-player unknown direct-ip player reports unknown
Hollow Knight: Silksong 2025 Unity SilklessCoop (Nek5) mod alpha story: no, enemies: no, world state: no, items: per-player up to 4 steam-relay player reports unknown
IRON NEST: Heavy Turret Simulator 2026 Unity 6 (IL2CPP) Nestmates mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2-5 steam-relay automated tests 2026-10
IRON NEST: Heavy Turret Simulator 2026 Unity 6 (IL2CPP) Iron Nest Co-Op Mod mod playable players visible: yes, story: yes, enemies: yes, world state: partial, items: shared 2-5 steam-relay player reports 2026-10
IRON NEST: Heavy Turret Simulator 2026 Unity 6 (IL2CPP) IronNestCoop mod playable players visible: yes, story: yes, enemies: unknown, world state: yes, items: partial 2-5 steam-relay untested 2026-08
IRON NEST: Heavy Turret Simulator 2026 Unity 6 (IL2CPP) Open Nest Co-op mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: partial unknown steam-relay untested 2026-09
IRON NEST: Heavy Turret Simulator 2026 Unity 6 (IL2CPP) VR. Co-op. PvP. (Iron Nest VR & Co-Op) mod prototype players visible: yes, story: partial, enemies: unknown, world state: unknown, items: unknown 2-4 (co-op in one nest), or PvP across two nests unknown untested 2026-07
Jak 3 2004 OpenGOAL (Jak 3 decompilation) jak3-multiplayer mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: unknown up to 8 direct-ip untested 2026-10
Jak 3 2004 OpenGOAL (Jak 3 decompilation) Jak 3 Online mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: yes, items: unknown unknown unknown untested 2026-10
Jak and Daxter 2001 OpenGOAL (PC reimplementation) Teamruns (OpenGOAL mod) mod playable players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports unknown
Just Cause 3 2015 Apex JC3-MP mod abandoned story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2016-07
Kingdom Come: Deliverance 2018 CryEngine KCDMP (MafiaHub, archived) framework abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Kingdom Come: Deliverance II 2025 CryEngine Kingdoms Connected (KCD:MP) mod partial story: no, enemies: partial, world state: partial, items: per-player 50 to 512 (sources conflict) dedicated-server untested 2026-09
Kingdom Come: Deliverance II 2025 CryEngine KCD2 co-op mod (DSOGaming coverage) mod partial story: partial, enemies: partial, world state: no, items: per-player unknown unknown untested unknown
Kingdom Hearts II Final Mix 2002 PC Steam version (memory-level mod) Kingdom Hearts II Co-op Multiplayer mod alpha players visible: yes, story: partial, enemies: yes, world state: unknown, items: unknown 2 unknown untested 2026-10
Lies of P 2023 Unreal Engine 4 Lies of P Co-op (Ember Wave) mod playable story: yes, enemies: yes, world state: yes, items: unknown 2 steam-relay player reports 2026-06
Little Inferno 2012 Tomorrow Corporation in-house (C++, Direct3D 11, Box2D) Little Inferno co-op mod alpha players visible: yes, story: yes, world state: yes, items: shared 2 ? player reports 2026-10
Little Nightmares 2017 Unreal Engine 4 Little Nightmares Co-op (Co-op Anything Discord) mod prototype enemies: partial unknown unknown untested 2026-10
Mad Max 2015 Avalanche Engine madmax-coop mod alpha players visible: yes, story: yes, enemies: yes, world state: partial, items: shared 2 direct-ip automated tests 2026-10
Mafia II 2010 Illusion Engine Mafia 2 Multiplayer (M2-MP) mod partial story: no, enemies: unknown, world state: unknown, items: unknown 1000 dedicated-server player reports 2012
Mafia II 2010 Illusion Engine Mafia2Online reborn (m2o-reborn) mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2018-11
Mafia: Definitive Edition 2020 Illusion Engine MafiaMP framework alpha story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2026-10
Mafia: Definitive Edition 2020 Illusion Engine MafiaCoop (JustAddMP) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: unknown unknown direct-ip untested 2026-10
Mafia: The City of Lost Heaven 2002 LS3D Lost Heaven Multiplayer / Mafia Multiplayer (MMP) mod partial story: no, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2015-10
Marvel's Spider-Man 2 2025 Insomniac proprietary The Amazing Web (Multiplayer) mod alpha story: unknown, enemies: unknown, world state: unknown, items: unknown unknown steam-relay untested unknown
Marvel's Spider-Man Remastered 2022 Insomniac proprietary Spider-Man Remastered Multiplayer (hbgda) mod partial players visible: yes, story: partial, enemies: yes, world state: partial, items: unknown up to 7 unknown player reports 2026-10
Mass Effect Legendary Edition 2021 Unreal Engine 3 Mass Effect Legendary Edition Multiplayer (LEMP) mod alpha story: no, enemies: yes, world state: no, items: unknown unknown direct-ip untested unknown
Max Payne 2: The Fall of Max Payne 2003 MaxFX Share The Payne mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
MDK2 HD 2011 BioWare in-house (MDK2), OpenGL 3, Lua 3.1 scripting mdk2-coop mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: shared up to 16 (tested with 8) steam-relay automated tests 2026-10
Mega Man X 1993 SNES (native PC static recompilation, snesrecomp) MegaManXSNESRecomp (X and Zero co-op) decomp-port playable players visible: yes, story: yes, enemies: yes, world state: yes, items: unknown 2 hosted-relay player reports 2026-10
Mega Man X4 1997 PS1 (native PC static recompilation, PSXRecomp) MegaManX4Recomp (X and Zero co-op) decomp-port alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: unknown 2 hosted-relay player reports 2026-10
Metal Gear Solid V: The Phantom Pain 2015 Fox Engine dynamite mod alpha players visible: partial, story: partial, enemies: partial, world state: partial, items: per-player 2 steam-relay player reports 2026-09
Metal Gear Solid V: The Phantom Pain 2015 Fox Engine Joint Operations mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown up to 16 (planned) unknown untested 2026-10
Metal Gear Solid V: The Phantom Pain 2015 Fox Engine mgs-v-multiplayer-mod mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-10
Metroid Prime 2: Echoes 2004 Wii in Dolphin (Gecko and patch code injection) Echoes co-op mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: shared 2-4 unknown player reports 2026-10
Middle-earth: Shadow of War 2017 Firebird (LithTech derivative) shadow-of-war-coop mod alpha players visible: yes, story: unknown, enemies: partial, world state: partial, items: unknown 2 vpn-needed automated tests 2026-11
MiSide 2024 Unity 2021.3.35f1 (IL2CPP) MiSide Together mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: shared 2-4 steam-relay automated tests 2026-10
Mount & Blade II: Bannerlord 2022 TaleWorlds proprietary Bannerlord Coop Campaign mod partial story: partial, enemies: partial, world state: yes, items: per-player up to 8 dedicated-server untested unknown
Mount & Blade: Warband 2010 Warband (WSE) Battle Time (and Floris Evolved coop) mod partial story: partial, enemies: yes, world state: no, items: no unknown direct-ip player reports unknown
Neverwinter Nights 2002 Aurora Official co-op (Enhanced Edition) official official story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested unknown
Night in the Woods 2017 Unity 5.6.2p4 (Mono) Night in the Woods Co-op prototype mod prototype players visible: no, story: partial, enemies: unknown, world state: partial, items: unknown 2 (shared Mae) direct-ip untested ?
No One Lives Forever 2: A Spy in H.A.R.M.'s Way 2002 LithTech Jupiter Coop Mod (Jerkakame) and Multiplayer Package mod partial story: yes, enemies: unknown, world state: unknown, items: unknown unknown direct-ip untested 2016-07
Noita 2020 Custom engine Noita Entangled Worlds mod playable players visible: yes, story: unknown, enemies: yes, world state: yes, items: yes unknown unknown player reports 2026-10
Obscure 2004 Hydravision in-house (.hvp archives, .hoe scripts); not RenderWare obscure-coop mod playable players visible: yes, story: yes, enemies: yes, world state: partial, items: per-player 2 steam-relay automated tests 2026-10
Outer Wilds 2019 Unity Quantum Space Buddies (QSB) mod playable story: partial, enemies: no, world state: yes, items: unknown unknown steam-relay player reports 2024-07
Outlast 2013 Unreal Engine 3 OpenOL (multiplayer beta, with OpenOL-Relay) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: unknown unknown hosted-relay automated tests 2026-08
Outlast 2013 Unreal Engine 3 OpenOL fork with a native enemy patch, play kit and tests (own development) mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: unknown unknown hosted-relay automated tests 2026-10
Outlast 2013 Unreal Engine 3 Outlast-Together mod abandoned players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-02
Overgrowth 2017 Phoenix (Wolfire) Full Coop (Campaign, arena...) mod playable players visible: yes, story: yes, enemies: yes, world state: yes, items: unknown 1-4 lan player reports 2021-10
Overgrowth 2017 Phoenix (Wolfire) Overgrowth Story Multiplayer mod partial players visible: yes, story: partial, enemies: yes, world state: partial, items: unknown unknown steam-relay player reports 2025-06
Overgrowth 2017 Phoenix (Wolfire) Overgrowth Online (CoreFX) fork alpha players visible: yes, story: partial, enemies: unknown, world state: unknown, items: unknown unknown steam-relay automated tests 2026-10
Overgrowth 2017 Phoenix (Wolfire) Wolfire Online Multiplayer Prototype official alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: unknown unknown steam-relay player reports 2022-04
Overgrowth 2017 Phoenix (Wolfire) OGMP mod abandoned players visible: yes, story: no, enemies: no, world state: no, items: no unknown dedicated-server untested unknown
Pacific Drive 2024 Unreal Engine 4 Pacific Drive Co-op (PDCoopNet) mod alpha players visible: yes, story: no, enemies: no, world state: partial, items: partial 2 direct-ip automated tests 2026-10
Perfect Dark 2000 N64 decompilation port (fgsfdsfgs port-net branch) perfect_dark port-net (netplay) decomp-port prototype players visible: yes, story: no, enemies: no, world state: no, items: no up to 8 (experimental) direct-ip untested 2026-05
Perfect Dark 2000 N64 decompilation port (PD2 fork on port-net) perfect-dark-2 (PD2) fork prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2026-10
Perfect Dark 2000 N64 decompilation port (fork) pd-friends-of-joanna fork prototype players visible: unknown, story: partial, enemies: unknown, world state: unknown, items: unknown 2-4 unknown untested 2026-10
Pilotwings 64 1996 N64 (native PC build from the Pilotwings64Decomp decompilation) Birdman64 (two-player split-screen) decomp-port playable players visible: yes, story: partial, enemies: unknown, world state: unknown, items: unknown 2 ? player reports 2026-10
Planetbase 2015 Unity (Mono) Planetbase Co-op mod alpha players visible: partial, story: unknown, enemies: unknown, world state: yes, items: shared 2+ steam-relay automated tests 2026-10
Pokemon Red/Blue (Gen 1 Recomp) 1996 Gen 1 recompilation (Pokeport engine) SilphNet mod playable players visible: no, story: no, enemies: no, world state: no, items: no unknown hosted-relay untested 2026-10
Pokemon Red/Blue (Gen 1 Recomp) 1996 Gen 1 recompilation (Pokeport engine) Gen1Co-op mod prototype players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 2 unknown untested 2026-07
Poppy Playtime 2021 Unreal Engine 4 PoppyCoop mod prototype players visible: yes, story: no, enemies: no, world state: no, items: no 2 steam-relay automated tests 2026-10
Prey (2017) 2017 CryEngine Prey Coop (CoopPrototype) mod alpha story: yes, enemies: unknown, world state: yes, items: unknown 2-16 direct-ip untested unknown
Quake 1996 Quake engine Millennium Co-Op mod playable story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2021-06
Quake 4 2005 id Tech 4 Q4 OpenCoop mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown 4 unknown untested 2007
Quake II 1997 id Tech 2 Co-Op Or Die mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown 4 dedicated-server untested 2015-07
Red Dead Redemption 2 2019 RAGE RDR2Coop (Chimiscuilo123) mod prototype story: unknown, enemies: unknown, world state: partial, items: unknown unknown unknown untested unknown
Red Dead Redemption 2 2019 RAGE RDRX framework prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Red Dead Redemption 2 2019 RAGE rdr2-coop-story mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown 2 vpn-needed untested unknown
Resident Evil 2 1998 Capcom proprietary re2coop mod prototype players visible: yes, story: partial, enemies: partial, world state: partial, items: shared 2 steam-relay automated tests 2026-10
Resident Evil 2 (2019 remake) 2019 RE Engine Local Couch Co-op (formerly HUNK'y Friend) mod playable story: yes, enemies: yes, world state: yes, items: unknown 2 lan player reports unknown
Resident Evil 2 (2019 remake) 2019 RE Engine RE2 Party Mode mod alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player 2-4 ? untested 2026-10
Resident Evil 4 (2005) 2005 MT Framework (Ultimate HD Edition) RE4 (NEW) Multiplayer Mod (CO-OP) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay untested unknown
Resident Evil 4 (2005) 2005 MT Framework (Ultimate HD Edition) RE4MP and remp mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-07
Resident Evil 4 (2023 remake) 2023 RE Engine Resident Evil 4 Multiplayer Mod (claybtv) mod partial story: yes, enemies: yes, world state: yes, items: unknown 2 hosted-relay player reports 2026-06
Resident Evil 7 biohazard 2017 RE Engine coop-re7 mod prototype players visible: yes, story: no, enemies: no, world state: no, items: no 2 steam-relay untested 2026-10
ReStory: Chill Electronics Repairs 2026 Unity ReStory Multiplayer mod playable players visible: partial, story: yes, enemies: unknown, world state: yes, items: shared 2 direct-ip automated tests 2026-10
Rick and Morty: Virtual Rick-ality 2017 Unity 5.4 (Mono) Rick and Morty Together mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2 steam-relay automated tests 2026-10
S.T.A.L.K.E.R. 2: Heart of Chornobyl 2024 Unreal Engine 5 ZoneCoop mod prototype story: no, enemies: no, world state: no, items: unknown 2 steam-relay untested unknown
S.T.A.L.K.E.R. Anomaly (standalone, X-Ray engine) 2018 X-Ray Anomaly Together mod playable story: unknown, enemies: unknown, world state: partial, items: partial 2-4 hosted-relay player reports 2026-09
S.T.A.L.K.E.R.: Call of Pripyat 2009 X-Ray (xrMPE) X-Ray Multiplayer Extension (xrMPE) co-op mod playable story: partial, enemies: unknown, world state: unknown, items: unknown 4 steam-relay player reports 2025-12
S.T.A.L.K.E.R.: Call of Pripyat 2009 X-Ray Ray of Hope (co-op online) mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
S.T.A.L.K.E.R.: Clear Sky 2008 X-Ray (xrMPE) Clear COOP mod alpha story: partial, enemies: unknown, world state: unknown, items: unknown 1-4 unknown untested 2024-03
S.T.A.L.K.E.R.: Shadow of Chernobyl 2007 X-Ray (xrMPE) Shadow of COOP mod playable story: yes, enemies: yes, world state: partial, items: unknown 4 steam-relay player reports 2026-08
S.T.A.L.K.E.R.: Shadow of Chernobyl 2007 X-Ray (xrMPE) Shadow of COOP fixes (stalker-soc-coop-fixes) mod playable story: yes, enemies: yes, world state: partial, items: unknown 4 steam-relay automated tests 2026-10
Sekiro: Shadows Die Twice 2019 FromSoftware proprietary sekiro-coop (Rust) mod prototype players visible: no, story: partial, enemies: partial, world state: partial, items: unknown 2 direct-ip untested 2026-06
Sekiro: Shadows Die Twice 2019 FromSoftware proprietary Sekiro Online mod abandoned story: partial, enemies: yes, world state: partial, items: per-player 2-6 steam-relay player reports 2021
Serious Sam: The Second Encounter 2002 Serious Engine 1 Official campaign co-op official official story: yes, enemies: yes, world state: unknown, items: unknown 16 direct-ip untested unknown
Serious Sam: The Second Encounter 2002 Serious Engine 1 AdvancedMultiplayer2 mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2024-06
Sifu 2022 Unreal Engine 4 SifuCoop (Zanci19) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: per-player 2 direct-ip untested 2026-10
Silent Hill 1999 Proprietary (Konami) Silent Hill: United mod partial story: yes, enemies: unknown, world state: unknown, items: unknown 2 hosted-relay untested 2026-09
Slime Rancher 2 2022 Unity Ranching Together (SR2MP) mod playable players visible: yes, story: partial, enemies: unknown, world state: yes, items: partial unknown direct-ip automated tests 2026-09
Slime Rancher 2 2022 Unity SR2MP (Saty) mod abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown up to 16 direct-ip untested 2024-02
Sonic Adventure 2 2001 PC Steam version with SA Mod Manager SA2 Chao Online mod playable players visible: unknown, story: no, enemies: no, world state: no, items: no up to 8 dedicated-server untested 2026-10
Sonic Adventure DX 2003 PC version with SADX Mod Loader sadx-multiplayer mod partial players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-07
Sonic Riders 2006 PC version with mod loader Riders.Tweakbox mod abandoned players visible: yes, story: no, enemies: no, world state: no, items: no unknown unknown untested 2025-09
Sonic Robo Blast 2 1998 Doom Legacy derived engine (fan game) SRB2 netgame Co-op official official players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports 2026-10
Spider-Man: Friend or Foe 2007 unknown Official Windows local co-op official official players visible: yes, story: yes, enemies: unknown, world state: unknown, items: unknown 2 (one PC) unknown untested 2007-10
Spider-Man: Friend or Foe 2007 unknown Spider-Man: Friend or Foe Co-op (Co-op Anything Discord) mod prototype ? unknown unknown untested 2026-10
Spider-Man: Friend or Foe 2007 unknown Friend or Foe Online (native Windows research) mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown 2 (target) unknown untested 2026-10
Spooky's Jump Scare Mansion: HD Renovation 2017 Unity 2021.3 (Mono) Spooky Together mod alpha players visible: yes, story: yes, enemies: yes, world state: partial, items: shared 2-4 steam-relay automated tests 2026-10
Spore: Galactic Adventures 2009 Spore (proprietary EA/Maxis, RenderWare rendering) Spore Multiplayer Mod (up for adoption) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: shared 2 dedicated-server automated tests 2026-09
Spore: Galactic Adventures 2009 Spore (proprietary EA/Maxis, RenderWare rendering) Spore Multiplayer Mod, Co-Me fork (Creature-stage patch) (up for adoption) fork alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: shared 2 dedicated-server automated tests 2026-10
Spore: Galactic Adventures 2009 Spore (proprietary EA/Maxis, RenderWare rendering) CoopMeld Spore Coop mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: shared 2-4 hosted-relay untested unknown
Spore: Galactic Adventures 2009 Spore (proprietary EA/Maxis, RenderWare rendering) SporeMP mod prototype players visible: yes, story: partial, enemies: unknown, world state: partial, items: unknown 2 dedicated-server untested 2026-10
Spyro 2: Ripto's Rage 1999 PS1 (ISO patch) Spyro2x2 mod partial players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 2 unknown untested 2025-09
Spyro: A Hero's Tail 2004 GameCube in Dolphin (Dolphin NetPlay) AHT_MultiPlayer mod prototype players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-12
Stacklands 2022 Unity Stacklands Co-op mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2-8 steam-relay automated tests 2026-10
Star Wars Jedi Knight II: Jedi Outcast 2002 id Tech 3 (OpenJK) Jedi-Outcast-Coop (fork of jedi-outcast-coop) fork partial players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player 2-4 direct-ip automated tests 2026-10
Star Wars Jedi Knight II: Jedi Outcast 2002 id Tech 3 (OpenJK) jedi-outcast-coop fork alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: per-player 2-4 direct-ip untested 2026-07
Star Wars Jedi Knight: Jedi Academy 2003 id Tech 3 (OpenJK) JACoop mod partial story: yes, enemies: yes, world state: unknown, items: per-player 2-16 direct-ip untested 2026-09
Star Wars Republic Commando 2005 Unreal Engine 2.5 GuestCoop / Republic Commando Coop Mod mod prototype story: partial, enemies: unknown, world state: unknown, items: unknown 2 lan player reports 2019-01
Star Wars: Knights of the Old Republic 2003 reone (engine reimplementation) KotOR co-op (McChaffeeFAF fork) decomp-port alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: shared 2 direct-ip automated tests 2026-10
Star Wars: Knights of the Old Republic 2003 reone (engine reimplementation) reone multiplayer decomp-port prototype story: unknown, enemies: unknown, world state: unknown, items: unknown 3 unknown untested 2025-04
StarCraft II: Wings of Liberty 2010 Blizzard SC2 engine SC2Coop (campaign co-op launcher) framework alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: shared 2 steam-relay automated tests 2026-10
Starfield 2023 Creation Engine 2 OrbitOnline mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Starfield 2023 Creation Engine 2 Starfield Together mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
Starfield 2023 Creation Engine 2 PULSAR mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown 2 hosted-relay untested unknown
State of Decay 2013 CryEngine 3 State of Decay CryEngine coop mod mod prototype players visible: yes, story: no, enemies: yes, world state: partial, items: per-player 4 lan untested 2026-10
Subnautica 2018 Unity Nitrox mod playable story: partial, enemies: unknown, world state: yes, items: unknown up to 100 (5 recommended) dedicated-server player reports 2026-04
Subnautica: Below Zero 2021 Unity Subnautica Multiplayer (Below Zero) mod alpha story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2024-12
Super Mario 64 1996 N64 decompilation PC port (sm64ex) sm64coopdx decomp-port playable players visible: yes, story: unknown, enemies: yes, world state: yes, items: unknown unknown unknown player reports 2026-10
Super Mario 64 1996 N64 decompilation PC port (sm64ex) sm64ex-coop decomp-port abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports 2024-07
Super Mario 64 1996 N64 emulation with memory hooks Net64 (net64-coop) mod abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2020-07
Super Mario Odyssey 2017 Nintendo Switch (code mod) Super Mario Odyssey Online mod partial players visible: yes, story: unknown, enemies: unknown, world state: partial, items: shared unknown dedicated-server untested 2026-09
Super Mario Sunshine 2002 GameCube in Dolphin with Better Sunshine Engine BSMSO (Better Super Mario Sunshine Online) mod playable players visible: yes, story: partial, enemies: unknown, world state: partial, items: shared up to 10 dedicated-server untested 2026-08
Superflight 2017 Unity SuperflightMP mod alpha players visible: yes, story: no, enemies: no, world state: partial, items: no 2-8 direct-ip automated tests 2026-10
Superflight 2017 Unity SFMF Multiplayer (up for adoption) mod abandoned players visible: yes, story: no, enemies: no, world state: partial, items: no unknown direct-ip untested 2022-01
SWAT 4 2005 Unreal Engine 2.0 Official co-op campaign official official story: yes, enemies: yes, world state: unknown, items: unknown 4-10 dedicated-server untested 2006-02
System Shock 2 1999 Dark Engine (Thief engine fork) SS2Tool multiplayer toggle (original co-op) mod playable story: yes, enemies: unknown, world state: unknown, items: unknown 3 direct-ip player reports unknown
System Shock 2 1999 Nightdive KEX / Dark Engine 25th Anniversary Remaster (official co-op) official official story: unknown, enemies: unknown, world state: unknown, items: unknown 4 unknown untested 2025-06
Tainted Grail: The Fall of Avalon 2025 Unity 2 Players Steam Coop (TGCoop) mod alpha players visible: yes, story: partial, enemies: partial, world state: partial, items: per-player 2 steam-relay player reports 2026-07
Teenage Mutant Ninja Turtles (TMNT) 2007 Ubisoft Jade TMNT local co-op (DLL injection) mod prototype players visible: yes, story: partial, enemies: partial, world state: unknown, items: unknown 2 unknown automated tests 2026-10
The Elder Scrolls II: Daggerfall 1996 Daggerfall Unity Daggerfall Unity Multiplayer (sixthlaw continuation) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025-07
The Elder Scrolls II: Daggerfall 1996 Daggerfall Unity DFU-Tanguy-Multiplayer mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2023-01
The Elder Scrolls III: Morrowind 2002 OpenMW TES3MP framework playable story: partial, enemies: unknown, world state: yes, items: unknown unknown dedicated-server player reports 2024-05
The Elder Scrolls IV: Oblivion 2006 Gamebryo MultiTES4 mod alpha story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested unknown
The Elder Scrolls IV: Oblivion 2006 Gamebryo SplitScreen for Oblivion mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: per-player 2 ? untested 2026-10
The Elder Scrolls IV: Oblivion 2006 Gamebryo Oblivion Online Mod (UDP, Python) mod prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2025
The Elder Scrolls IV: Oblivion 2006 Gamebryo OblivionOnline mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown 12 dedicated-server untested 2008
The Elder Scrolls IV: Oblivion 2006 Gamebryo Co-op Oblivion (same-PC) mod abandoned story: unknown, enemies: unknown, world state: unknown, items: unknown unknown lan untested 2011
The Elder Scrolls IV: Oblivion Remastered 2025 Unreal Engine 5 with Gamebryo OblivionMP (OB:MP) framework prototype story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay untested 2026-03
The Elder Scrolls V: Skyrim 2011 Creation Engine Skyrim Together Reborn mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown player reports 2022-07
The Elder Scrolls V: Skyrim 2011 Creation Engine Tilted Evolution (Tilted Online) framework partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-10
The Elder Scrolls V: Skyrim 2011 Creation Engine SkyMP framework partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-10
The Elder Scrolls V: Skyrim Special Edition 2016 Creation Engine Skyrim Together Reborn mod playable story: unknown, enemies: unknown, world state: partial, items: unknown 2-8 dedicated-server player reports 2026-10
The Elder Scrolls V: Skyrim Special Edition 2016 Creation Engine SkyMP framework partial story: no, enemies: unknown, world state: partial, items: per-player unknown dedicated-server player reports unknown
The Last of Us Part II Remastered 2025 Naughty Dog proprietary ProjectSync mod prototype players visible: yes, story: no, enemies: yes, world state: unknown, items: partial 2 unknown untested 2026-10
The Last of Us Part II Remastered 2025 Naughty Dog proprietary TLOU2 Co-op (Awperati) mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown 2 lan untested 2026-10
The Last of Us Part II Remastered 2025 Naughty Dog proprietary TLOU2 Multiplayer Mod (Speclizer) mod abandoned players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown 2-8 unknown untested 2026-09
The Last of Us Part II Remastered 2025 Naughty Dog proprietary TLOU2 Co-op Hook (foufouadi) mod abandoned players visible: partial, story: no, enemies: no, world state: no, items: no 2 lan untested 2026-08
The Legend of Zelda: A Link to the Past 1991 SNES in custom bsnes build (bsnes-as with AngelScript) ALttP Online (ALttPO) mod playable players visible: yes, story: unknown, enemies: unknown, world state: partial, items: partial unknown dedicated-server player reports 2026-03
The Legend of Zelda: A Link to the Past 1991 SNES PC port (snesrev/zelda3) Zelda3-Multiplayer fork prototype players visible: unknown, story: unknown, enemies: yes, world state: unknown, items: yes unknown vpn-needed untested 2026-09
The Legend of Zelda: Majora's Mask 2000 N64 emulation via ModLoader64 (Mupen64Plus) Zelda64 Online (Majora's Mask mode) mod partial players visible: yes, story: partial, enemies: unknown, world state: partial, items: partial unknown dedicated-server untested 2023-01
The Legend of Zelda: Majora's Mask 2000 Zelda64Recomp (N64 static recompilation) MMChat mod prototype players visible: unknown, story: unknown, enemies: unknown, world state: partial, items: shared unknown dedicated-server untested 2026-10
The Legend of Zelda: Majora's Mask 2000 2 Ship 2 Harkinian (decomp PC port) anchor-2s2h (Anchor for 2 Ship 2 Harkinian) fork prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown hosted-relay untested unknown
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (Ship of Harkinian, libultraship) Anchor (built into Ship of Harkinian) decomp-port playable players visible: yes, story: partial, enemies: no, world state: partial, items: shared unknown hosted-relay player reports 2026-10
The Legend of Zelda: Ocarina of Time 1998 N64 emulation via ModLoader64 (Mupen64Plus) Zelda64 Online (Ocarina of Time Online) mod partial players visible: yes, story: partial, enemies: partial, world state: partial, items: shared up to 15 dedicated-server player reports 2023-01
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (Ship of Harkinian fork with Archipelago) Archipelago-SoH fork partial players visible: no, story: no, enemies: no, world state: no, items: shared unknown hosted-relay untested 2026-07
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (Ship of Harkinian fork on Anchor) OOT True Co-op fork alpha players visible: yes, story: partial, enemies: yes, world state: partial, items: partial 2 hosted-relay untested 2026-07
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (Ship of Harkinian fork) Shipwright-Online fork prototype players visible: unknown, story: unknown, enemies: partial, world state: partial, items: partial 2 hosted-relay untested 2026-10
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (Ship of Harkinian fork) ocarina-coop fork prototype players visible: yes, story: partial, enemies: partial, world state: partial, items: partial unknown hosted-relay untested 2026-10
The Legend of Zelda: Ocarina of Time 1998 N64 decompilation port (OOT True Co-op fork) 7 Days to Zelda fork prototype players visible: unknown, story: unknown, enemies: yes, world state: unknown, items: unknown unknown hosted-relay untested 2026-10
The Legend of Zelda: Skyward Sword 2011 Nintendo in-house (EGG / NW4R g3d), Wii; decompilation zeldaret/ss ss-coop emulator-netplay alpha players visible: yes, story: yes, enemies: partial, world state: partial, items: per-player 2 direct-ip automated tests 2026-10
The Legend of Zelda: The Wind Waker 2003 GameCube in Dolphin (memory sync) Windwaker-coop mod partial players visible: no, story: yes, enemies: no, world state: partial, items: shared unknown vpn-needed untested 2024-01
The Legend of Zelda: The Wind Waker 2003 GameCube in Dolphin WW-Online mod alpha players visible: yes, story: partial, enemies: unknown, world state: partial, items: partial up to 4 unknown untested 2026-10
The Legend of Zelda: The Wind Waker 2003 GameCube in Dolphin (PowerPC code injection) ww-multiplayer mod prototype players visible: yes, story: no, enemies: no, world state: no, items: no unknown lan untested 2026-10
The Legend of Zelda: Twilight Princess 2006 Dusklight (from-scratch reimplementation) Crests of Courage mod partial players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown 2-16 hosted-relay untested 2026-10
The Legend of Zelda: Twilight Princess 2006 Dusklight (from-scratch reimplementation) Heroes of Twilight fork partial players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-10
The Legend of Zelda: Twilight Princess 2006 Dusklight (from-scratch reimplementation) dusklight-multiplayer fork prototype players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-08
The Long Dark 2017 Unity SkyCoop mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown up to 32 dedicated-server untested 2026-10
The Lord of the Rings: The Two Towers 2002 Stormfront Fusion (Xbox), static recompilation to PC (The Two Towers Recompiled, xboxrecomp) Two Towers couch co-op (on The Two Towers Recompiled) mod alpha players visible: yes, story: yes, enemies: yes, world state: yes, items: per-player 2 unknown automated tests 2026-10
The Witcher 3: Wild Hunt 2015 REDengine 3 Witcher Online mod partial players visible: yes, story: no, enemies: no, world state: partial, items: per-player unknown dedicated-server player reports 2026-08
The Witcher 3: Wild Hunt 2015 REDengine 3 W3Coop (Witcher Online for Remastered) fork alpha players visible: yes, story: no, enemies: no, world state: unknown, items: per-player unknown steam-relay automated tests 2026-10
The Witcher 3: Wild Hunt 2015 REDengine 3 WitcherMMO fork prototype players visible: yes, story: no, enemies: no, world state: partial, items: per-player unknown dedicated-server untested 2026-10
The Witcher 3: Wild Hunt 2015 REDengine 3 w3m (momo5502) mod prototype players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown dedicated-server untested 2026-01
The Witcher 3: Wild Hunt 2015 REDengine 3 Witcher3-Multiplayer (werasik2aa) mod abandoned players visible: yes, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2026-01
The Witcher 3: Wild Hunt 2015 REDengine 3 Witcher3-MP (Hyjarion) mod abandoned players visible: unknown, story: unknown, enemies: unknown, world state: unknown, items: unknown unknown unknown untested 2023-05
The Witness 2016 In-house engine (Thekla); family not confirmed from the binary witness-coop mod prototype players visible: yes, world state: partial 2 (two copies on one PC) direct-ip automated tests 2026-10
Thief II: The Metal Age 2000 Dark Engine (NewDark) NewDark multiplayer beta (Thief2MP.exe) + T2MPFix mod playable players visible: yes, story: yes, enemies: yes, world state: unknown, items: unknown 2-8 direct-ip automated tests 2026-10
Thief II: The Metal Age 2000 Dark Engine (NewDark) Thief Multiplayer (restored T2 multiplayer) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown direct-ip player reports unknown
TimeShift 2007 Saber3D (Saber Interactive), Direct3D 9, Havok, FMOD, Bink; own event-driven level script language TimeShift Co-op mod alpha players visible: yes, story: yes, enemies: yes, world state: partial, items: unknown 2-4 direct-ip automated tests 2026-11
Tom Clancy's Splinter Cell: Chaos Theory 2005 Unreal Engine 2.5 Official co-op campaign plus Enhanced (EnhancedSC) official official story: unknown, enemies: unknown, world state: unknown, items: unknown 2 vpn-needed player reports 2026-10
Tony Hawk's Underground 2 2004 Neversoft engine thug2-coop mod alpha players visible: yes, story: yes, enemies: no, world state: yes, items: per-player 2 direct-ip player reports 2026-10
Unreal 1998 Unreal Engine 1 Wolf Coop mod playable story: unknown, enemies: unknown, world state: unknown, items: unknown unknown direct-ip untested unknown
Unreal 1998 Unreal Engine 1 RTNP-UER (Return to Na Pali coop) mod partial story: yes, enemies: unknown, world state: unknown, items: unknown unknown direct-ip untested 2022
Vampire: The Masquerade - Bloodlines 2004 Source (2004) VTMBMP (multiplayer restoration) mod partial story: unknown, enemies: unknown, world state: unknown, items: unknown unknown direct-ip player reports unknown
Vampire: The Masquerade - Redemption 2000 Nihilistic Zorro engine The Age of Redemption mod playable story: yes, enemies: unknown, world state: unknown, items: unknown unknown vpn-needed player reports unknown
World of Goo 2008 2D Boy in-house ("Boy" framework, SDL2 + OpenGL) World of Goo co-op mod alpha players visible: yes, story: partial, enemies: yes, world state: yes, items: shared 2 ? player reports 2026-10
XCOM 2: War of the Chosen 2017 Unreal Engine 3 WOTC Co-op Campaign mod prototype players visible: no, story: no, enemies: no, world state: partial, items: shared 2 direct-ip automated tests 2026-10
XCOM 2: War of the Chosen 2017 Unreal Engine 3 XCOM 2: Tactical Co-Op (Team Dragonpunk) mod abandoned players visible: yes, story: partial, enemies: yes, world state: unknown, items: unknown 2 unknown untested 2017-09
Yakuza 0 2015 unknown Yakuza 0 DC Co-op (Jhrino) mod playable story: yes, enemies: yes, world state: unknown, items: unknown 2-4 lan player reports unknown
Yu-Gi-Oh! 5D's Tag Force 4 2009 unknown Yu-Gi-Oh! 5D's Tag Force 4 Co-op (Co-op Anything Discord) mod prototype ? unknown unknown untested 2026-10
Zoo Tycoon 2001 Blue Fang proprietary (C++, DirectDraw); built on openzt ZooTogether mod alpha players visible: yes, story: unknown, enemies: unknown, world state: partial, items: shared 2 direct-ip automated tests 2026-10

Up for adoption

Unfinished co-op projects whose authors have stopped working on them and would like someone to carry on. Pick one up, fork it, and open a claim issue so others know.

Game Project Status Notes
Crimson Desert Crimson Desert Multiplayer (cdmp) (up for adoption) alpha ASI mod (Ultimate ASI Loader) for Steam build 1.0.0.2976 / game version 2.03.02 only; turns itself off on other builds. Each player stays in their own save and sees the other; hostile enemies near the host are shared (experimental); quests, NPCs and items are not shared; Steam friends only. GPL-3.0. The author stopped work at v0.2.0 and invites others to continue it. A revival focused on shared quest progress is claimed in cranebeaker/coop-anything#51: builds on Linux with clang-cl + xwin, one-PC echo smoke test ran under Proton (no automated two-player test yet). Research and dated notes in games/crimson-desert.
Spore: Galactic Adventures Spore Multiplayer Mod (up for adoption) alpha Cell stage only, the first of SPORE's five stages; after Cell the mod shows an end screen instead of the landfall transition, so Creature, Tribal, Civilization and Space have no co-op at all. A native C++ client (Spore ModAPI plus Detours, pinned to the executable by hashed RVA) talks to a separate C# TCP session server that brokers state and broadcasts player positions, appearance, NPC snapshots and world actions. Supported setup is two windows on one PC with two ModAPI Launcher Kit installs and a second profile at %AppData%\SporeCoop2; remote play between computers is unfinished and world transfer between machines is not implemented. Latest release v1.0.1 (2026-09-27, protocol 10), 21 commits in 10 days and no issues tracker. The licence is ambiguous - the LICENSE file is MIT, but the core sources (native/Probe.cpp, server/SessionServer.cs and 18 other files) carry SPDX-License-Identifier GPL-3.0-or-later headers and the rest carry none, so the project as published is MIT plus GPL-3.0-or-later code. Release zip SHA-256 verified against the published sum. Verified on the Steam October 2024 build (app 24720, exe 25 066 744 bytes, version 3.1.0.29) on 2026-10-21, where the mod's own scripted suites pass (142 protocol assertions plus native source invariants) and two real game clients were launched end to end and both completed a handshake with the session server, which logged Connected host and Connected guest. Two launch steps the upstream README omits were needed, a steam_appid.txt file with the app id 24720 in the game folder, without which the game exits with code 53, and a second copy of the ModAPI Launcher Kit per window, because the kit overwrites its own mLibs\SporeModAPI.dll on every launch. Still not verified are two players in one world, because the invite flow is in-game UI clicks with no scriptable trigger, and the 154 native engine checks, which need a test binary that is not shipped in the release and cannot be built without MSVC. Upstream itself still stops at the Cell stage; a fork with a Creature-stage transition patch is listed separately below.
Spore: Galactic Adventures Spore Multiplayer Mod, Co-Me fork (Creature-stage patch) (up for adoption) alpha Fork of emerald194520350-alt/spore-multiplayer-mod with one commit on top of upstream v1.0.1 that lets a live cooperative session continue past the Cell stage. Upstream intercepts the landfall and shows an end screen; the patch reports the Cell stage completion to the session server, lets the native landfall and the land editor run, and reports the entered stage with a new stageTransition message that the server validates, advances and broadcasts to both windows. The protocol stays at 10 and the message is additive, so an unmodified upstream client still connects. The Cell stage completion became a fact about the shared world and survives a server restart, and the shared stage is persisted. Creature-stage gameplay synchronisation is NOT implemented - two players still do not see each other's creature, a shared planet, shared herds or creature interactions, and the Creature simulator stays local to each window. Verified on the Steam October 2024 build (app 24720, exe 25 066 744 bytes, version 3.1.0.29) on 2026-10-22 - the fork builds from a clean checkout with MSVC v143, its own suites pass (148 protocol assertions, 119 native assertions, the source invariants), a new end-to-end test drives two real native clients through the real invitation handshake against the real session server and moves the shared world from cell to creature over TCP, and the rebuilt DLL was loaded into two live game windows that both completed the handshake. NOT verified - the Cell stage was never played through to its end in a running game, so the landfall, the land editor and the stage report still need one interactive confirmation, and Creature-stage gameplay was not tested at all. The patch is released under GPL-3.0-or-later; upstream's LICENSE file says MIT while its core sources carry GPL-3.0-or-later SPDX headers, and that upstream inconsistency is left untouched.
Superflight SFMF Multiplayer (up for adoption) abandoned Plugin for the author's own SFMF mod loader (Unity UNet, direct IP, port 4444, host also plays). Shows other players as coloured spheres with name and score, and sends the host's world seed so everyone flies the same map; the game has no enemies, items or story. Source committed 2018-12, DLL released 2022-01 with no play reports found; the author wrote in 2025-01 that it probably no longer works and had released the source in 2018 for others to finish. No license stated. Loads only under Phlarfl's launcher 1.2.0, not the maintained SFMF v2 (vicjohnson, MIT, no multiplayer mod). Audit in games/superflight; a new BepInEx plugin (SuperflightMP, own entry) replaces it.

Open gaps

Loved single-player games where no co-op project was found. Searched sources are in the YAML. If you find one, replace the gap entry with a real one.

Game Year Engine Notes
Alan Wake 2 and Control 2023 Northlight Alan Wake 2 has a mod loader and modding docs on GitHub but no multiplayer mod; I found nothing for Control. Remedy's FBC Firebreak is an official co-op game in the Control universe. Reddit could not be searched with my tool.
Assassin's Creed Origins, Odyssey and Valhalla 2017 AnvilNext No campaign co-op mod found for any recent entry; Unity has official side-mission co-op with a chat-fix mod, and Brotherhood and Revelations only have multiplayer NPC overhauls. Reddit could not be searched with my tool.
Call of Duty 2003 IW 1.0 (Call of Duty, id Tech 3 derived) No campaign co-op mod found. A 2025 Steam reply names a "CoD 1 Cooperative Mod" with no link or author; no build was found. The ModDB "Call of Duty 1 Splitscreen PC v1.1" file is a 318-byte multiplayer splitscreen launcher, not campaign co-op. Research and reverse-engineering notes for the 1.5 singleplayer exe (4 server client slots kept, network transport stripped to loopback) and a per-mission script survey are in games/call-of-duty. The native networking part is open for someone to take on.
Call of Duty: Modern Warfare 3 2011 IW 5.0 (Call of Duty) No campaign co-op has released for Modern Warfare 3 (2011) on any platform, and no project ships it; the singleplayer engine carries no netcode. Spec Ops/Survival co-op does exist (official, and via the AlterWare client). A from-zero attempt is written up in games/modern-warfare-3.
Call of Duty: United Offensive 2004 IW 1.0 (Call of Duty, id Tech 3 derived) No campaign co-op mod found. CoDUO-YAP (GPL-3.0, active 2026-10) is a singleplayer and multiplayer quality-of-life plugin with a loader and hooks for the UO exe, a possible base. Open CoD:UO (opencoduo/coduomp) reconstructs the multiplayer client and server source but states no license and has no singleplayer AI code. See games/call-of-duty (UO 1.51 not analysed per mission yet).
Command & Conquer 3 Kane's Wrath 2008 SAGE (C&C3 era) No campaign co-op found. Same engine seams as Tiberium Wars (lobby side stripping, Steam/LAN netcode), so the Tiberium Wars prototype should port; see games/command-and-conquer-3.
Crash Bandicoot 4: It's About Time 2020 Unreal Engine 4 No online or simultaneous co-op mod found; the game ships only local hotseat Pass N. Play and Bandicoot Battle. Groundwork in games/crash-bandicoot-4 (Steam build, UE 4.24.2) - UE4SS v3.0.1 runs when injected after SteamStub unpacks and with HookLoadMap = 0; the game ships unused multiplayer classes (LavaMPGameMode Lobby/Match, MPLavaPlayerController) and a replicated combat framework; a listen server starts, but a second copy on one PC crashes after about 56 s.
Dead Space 2008 Visceral Engine No co-op mod for Dead Space 1 on PC found. Visceral cut co-op during development; a Steam Workshop Dead Space CO-OP Edition is a Garry's Mod collection, not a mod for the game.
Dead Space (2023 remake) 2023 Frostbite Only Dead Space 2 competitive multiplayer revival and Garry's Mod co-op maps turned up; nothing for the remake. Reddit could not be searched with my tool.
Death Stranding 2020 Decima PC release year shown; only a Director's Cut mod loader exists (NRTnarathip/DeathStrandingModLoader) with no multiplayer features. Game already has asynchronous shared structures. Reddit could not be searched with my tool.
Freedom Fighters 2003 Zero (IOI engine) No playable co-op mod. A reverse-engineering repo (jackedhawk-117/freedom-fighters-re) reports the PC exe still has multiplayer code but re-enabling the lobby alone gives no playable match.
Ghost of Tsushima Director's Cut 2024 Sucker Punch proprietary PC release year shown; Nexus and ModDB list single-player mods only. Reddit could not be searched with my tool.
Ghostrunner 2020 Unreal Engine 4 No co-op or multiplayer mod found for Ghostrunner or Ghostrunner 2 on any platform. The GOG build is Unreal Engine 4.26; engine networking and runtime hook findings are written up in games/ghostrunner.
God of War (2018) 2022 Santa Monica Studio Kinetica PC release year shown; no public co-op mod found on GitHub/Nexus/ModDB. Static and runtime analysis of Steam build 11168363 (games/god-of-war-2018) verified that GoW.exe code/data are unencrypted on disk, gameplay and Atreus AI run on 1,423 uncompressed Lua 5.2 scripts in .wad files with full debug info, GoW.exe links socket.core (LuaSocket TCP/UDP) and cmsgpack into every Lua VM, and an asymmetric Kratos + Atreus UDP co-op prototype (version.dll + creature/locomotion.lua in son00's VM) was built and verified with 2 simultaneous instances and tools/chaos on 1 PC.
Heat Signature 2017 GameMaker Studio 1 (YYC) Single-player only; the Steam page says players are never in the same world. A from-zero co-op mod (up to 4 players, version.dll + MinHook) is in progress, see games/heat-signature and issue 274; host + 1 guest pass a 14-check automated suite on localhost, not released.
Hitman: Blood Money 2006 Glacier No playable co-op mod found for the older Hitman games. A Steam guide mentions a ReHitman reverse-engineering effort aiming for multiplayer, with no release seen. Hitman 3 has unrelated Nexus co-op mods.
Horizon Zero Dawn 2020 Decima PC release year shown; Nexus and ModDB list only single-player mods, and the Remastered Steam thread has players asking for co-op. Reddit could not be searched with my tool.
Hotline Miami 2: Wrong Number 2015 GameBaker 2.0 / SilverWare (Abstraction Games; GML converted to native C++) No co-op mod for the retail game found. HotlineMultiplayer is a separate Godot remake, and a 'Hotline Miami MULTIPLAYER mod' video targets the first game with unfinished netcode. Build-from-zero work started in games/hotline-miami-2.
Mass Effect / Mass Effect 2 2007 Unreal Engine 3 No co-op campaign mod found for ME1 or ME2. Players have only requested it for the Legendary Edition. ME3 has an official horde co-op, a Nexus proof-of-concept campaign co-op for ME3, and LEMP brings ME3-style multiplayer to the Legendary Edition.
Mass Effect Legendary Edition 2021 Unreal Engine 3 No campaign co-op released; Nexus forum threads only request it, and an ME3 proof-of-concept co-op mission mod was abandoned by its author. Reddit could not be searched with my tool.
Max Payne 2001 MaxFX No working co-op or multiplayer mod found for the first Max Payne. Max Payne 3 has official co-op. A Steam Workshop item named max payne coop was seen but not opened.
Metro 2033 2010 4A Engine No co-op campaign mod found. Metro: Terminus (a Call to Arms conversion) was archived, Metro 2033 H Hour is described as dead, and a Redux Extended World pack mentions a multiplayer mod without detail.
Metro Exodus 2019 4A Engine No co-op mod found; Steam threads just ask for it. 4A released an official Exodus SDK with mod.io support, so a mod is technically possible. Reddit could not be searched with my tool.
Middle-earth: Shadow of War 2017 Firebird (LithTech derivative) No co-op or multiplayer mod found; the game's online features (Vendettas, Online Conquest) are asynchronous only. JustAddMP/ShadowOfWar is a placeholder repo ("planned", README only, 2026-10-17). Research and reverse-engineering notes for Steam build 3095001 (test-copy isolation, debug-print capture, Nemesis event, death, promotion and RNG functions with signatures) are in games/shadow-of-war; claim issue cranebeaker/coop-anything#93.
Persona 5 Royal 2022 Atlus in-house (GFD), closed native x64 binary with Denuvo No co-op or multiplayer mod found for the PC version (Steam 1.0.4.0). The game has no Remote Play Together on Steam. A shared-screen prototype made with Co-op Anything (one game, each battle turn routed to the owning player's XInput pad) works in an owner playtest but is not public yet; reverse-engineering findings (battle actor pointer chains, input layer) are in games/persona-5-royal.
Prey (2006) 2006 id Tech 4 No co-op campaign mod found. The Prey 2006: A Talon Brave Game port restores competitive multiplayer only. The co-op mod that exists is for the 2017 Prey.
Psychonauts 2005 Despair Engine / Gamebryo No co-op or multiplayer mod found; results were texture packs, fixes and an Archipelago randomizer integration.
Resident Evil 2 (2019 remake) 2019 RE Engine No released online campaign co-op mod found in the sources searched on 2026-10-23. Local Couch Co-op and RE2 Party Mode provide local play; see their separate entries. This is a dated research gap, not proof that no private or unreleased prototype exists.
Resident Evil Requiem 2026 RE Engine No official co-op and no released co-op mod. Two creators are showing an unreleased co-op mod on YouTube (name, download and source unknown); check it before starting from zero. REFramework loads on the game, so the RE2 and RE4 (2023) co-op mod tooling applies. Reddit not checked.
Resident Evil Revelations 2012 MT Framework CORRECTED 2026-10-22. No campaign co-op: the only two-player mode is Raid Mode in the main menu, the campaign pause menu has no invite path, and the mode field at *(sGameSystems+0x24)+0x20 reads 0 at the menus and 1 in Raid, so the earlier note here about a dormant campaign co-op was wrong. The binary does carry a host-authoritative network layer and an extensible type registry that Raid uses today, but building campaign co-op on them from scratch is unproven - no peer has ever been connected.
Resident Evil Village 2021 RE Engine No campaign co-op mod found; only the official Re:Verse mode exists. REFramework tooling that powered the RE2 and RE4 mods applies, so it is a feasible gap. Reddit could not be searched with my tool.
Risen 2009 Genome No co-op or multiplayer mod found for Risen; results only showed unofficial patches and single-player mods.
Silent Hill 2 2001 Proprietary (Konami) No co-op mod found for the 2001 original. The co-op work seen targets Silent Hill 1 (Silent Hill: United) and the 2024 remake (GhostCoop).
Sleeping Dogs: Definitive Edition 2014 unknown A 2024 Nexus comment says modder sneakyevil has long been working on an MP mod that stalled; a widely shared video is warned about as a survey scam. Treat as unconfirmed. Reddit could not be searched with my tool.
Spore: Galactic Adventures 2009 Spore (proprietary EA/Maxis, RenderWare rendering) The Creature, Tribal, Civilization and Space stages of the Galactic Adventures expansion have no co-op implementation in any project found. The best existing project covers the Cell stage only, the one project that aimed further (CoopMeld Spore Coop) has a paused service and lists Civilization and Space as coming later, and the third (SporeMP) is a prototype pinned to a different store build. The Space stage is also a different game from the Cell stage the existing mod handles, 3D galaxy flight with planets and cities, so it would be new work rather than a port.
Star Wars Jedi: Fallen Order and Survivor 2019 Unreal Engine 4 Only single-player mods and a discontinued blueprint mod loader (FallenOrderModLoader) turned up. Reddit could not be searched with my tool.
Star Wars Outlaws 2024 Snowdrop (closed native x64 binary with Denuvo) No co-op or multiplayer mod found (Ubisoft Connect build, exe SHA-256 371BE3E5...1D2F). The exe contains an unreleased 2-4 player co-op heist mode (CoopHeistMode, CanStartCoopMatch, team lives, reinforcement waves, ping points), and a runtime read confirmed all seven co-op and heist settings files ship and load. Snowdrop's session layer (reliable UDP, hot-join, host migration) is linked; matchmaking goes through Ubisoft services. Not playable; findings and tools in games/star-wars-outlaws.
The Godfather II 2009 Visceral Engine No PC story-campaign co-op project surfaced; the restored match multiplayer and the SE script extender are not campaign co-op. Research on branch game/the-godfather-ii (claim issue
The Last of Us Part I 2023 Naughty Dog proprietary PC release year shown; no PC co-op mod found. The Nexus and Steam videos titled first cooperative splitscreen mod 2025 appear to target the PS3 original and I could not verify them. Reddit could not be searched with my tool.
Thief: The Dark Project / Gold 1998 Dark Engine No dedicated co-op mod for Thief 1 or Gold found. A Steam guide on Thief Gold multiplayer was seen but not opened, and Thief II has the T2 multiplayer project listed separately.
Titanfall 2 (campaign) 2016 Source (modified) Steam threads say campaign co-op is not possible; one poster recalls an unnamed sponsor-only co-op campaign video. Northstar adds PvE hosting and the Icepick tool runs single-player mods, but neither is campaign co-op. Official Frontier Defense is horde mode.
Vanquish 2010 Platinum Engine (in-house, Havok physics) No co-op or multiplayer mod found for the PC port (Steam 460810, 2017). The game shipped with no multiplayer at all and PlatinumGames said at release they never built any. Modding on Nexus is limited to cheat tables, trainers and texture/skin packs. Build from zero would mean reverse engineering a closed custom-engine binary (C++, Havok, script files in .pkg-style archives) with no netcode, no scripting layer and no same-engine co-op framework; see games/vanquish for what is known and where to start.
Wolfenstein: The New Order and Wolfenstein II 2014 id Tech 5 No co-op mod found for either game; the searches only surfaced unrelated Men of War and HOI4 mods named The New Order. RTCWCoop exists for the 2001 game only. Reddit could not be searched with my tool.
World in Conflict (with Soviet Assault) 2007 Masstech (Massive Entertainment) No campaign co-op mod found. The game ships LAN multiplayer, a dedicated server and AI bots, and single player runs on the same server code behind one flag; every original-campaign map is also an MP map. Research and design notes in games/world-in-conflict.
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