How OPEN//77 works.

Overview#

OPEN//77 is a multiplayer platform for Cyberpunk 2077. Each community operates its own dedicated server, gamemode and rules.

How it works (for players)#

1. 01

   Own the game

   OPEN//77 requires your own legal copy of Cyberpunk 2077, at build 2.31, with Phantom Liberty DLC. The platform never distributes game content. It builds on the game you bought. Pirated or cracked copies are not supported and not welcome.
2. 02

   Install the client

   The OPEN//77 client runs alongside your installation. Your single-player game, saves and mods stay untouched.
3. 03

   Browse the servers

   Open the server browser, filter by game mode or language, read a server's page, and pick the world you want to live in tonight.
4. 04

   Connect & play

   The client fetches that server's resource set, verifies its signature and content hashes, and drops you into Night City alongside everyone else on that server.

Requirements#

Players need a legal copy of Cyberpunk 2077 at the exact supported game build, with Phantom Liberty installed. Newer game builds are not automatically compatible; see the requirements below.

To play

Your own legal copy of Cyberpunk 2077

OPEN//77 never distributes the game or any of its assets. It builds on the installation you already own: bought, not pirated. Cracked copies are not supported and not welcome.

Game build 2.31

This exact build, not a minimum. The client hooks the game engine at addresses established for it and refuses to load when they do not match.

Phantom Liberty DLC

The expansion ships as EP1, and the client needs it: the world it loads when you connect to a server is an EP1 save.

Windows 10 or 11, 64-bit

The client is a native Windows plugin that loads inside the game process.

To host a server

The dedicated server runs independently of the game and does not require game assets.

The game is not needed

A dedicated server runs independently of Cyberpunk 2077, REDengine and the client plugin. It never loads game content and never needs a copy installed.

Windows x64 or Linux x64

Both official server packages include the .NET runtime and native networking dependencies. No separate .NET installation or copy of the game is needed on the host.

Your players still need all of the above

Everyone who connects needs Cyberpunk 2077 2.31 + Phantom Liberty DLC on their own machine. Hosting changes nothing about that.

Dedicated servers#

A dedicated server owns shared world state and accepts player connections. OPEN//77 does not use peer-to-peer sessions.

• Persistent worlds

  The world keeps running when you log off. Economies, factions and stories continue. The server remembers.

• Authoritative state

  Positions, inventories, vehicles, loot, time and weather: the server decides what is true, and clients render approved state. That is what makes real economies and fair PvP possible.

• Operated by communities

  Everyone with Alpha access can download the Windows or Linux server, configure their platform license and build their own worlds. No separate developer application is required. Players need Alpha access to join.

Resources & scripting#

Gameplay is packaged as resources: self-contained directories with a manifest, Lua scripts, declared permissions, dependencies and optional web interfaces. The server picks the resource set for a session; connecting clients download it, verify its signature and content hashes, and activate it before entering the world.

Vehicles

network identity, streaming, authority leases, seats, doors and damage

NPCs

server-owned templates, streaming, task queues and life state

Loot

authoritative ground drops and validated pickups

Time and weather

synchronised session time and weather presets

Elevators

server-authoritative native lifts with late-join catch-up

Interactions

contextual world and NPC prompts with action keys

Custom UI

WebUI pages, toasts, blips and map pins

Identity and ACL

durable player ids, whitelists and restricted commands

resource "hello"
version "1.0.0"
auto_start true

client_script "client/main.lua"
server_script "server/main.lua"

permissions { "network.events", "world.loot" }

RegisterCommand("hello", function(source, args)
    print(("player %d said hello"):format(source))
end, false)

That is the real API, not a sketch: every registered function is listed in the Lua API reference, separated by runtime so a client projection is never mistaken for server authority. The surface will still change while the project is in Alpha. Read the access guide and limitations.

Roadmap#

Alpha members can play, download the server and build custom gamemodes now. Development priorities include reliability, compatibility and the resource ecosystem; release dates are not guaranteed.

1. NOWALPHA

   Build and test today

   Launcher and Windows/Linux server packages, Freeroam, a live server browser, WebUI and documented client/server Lua APIs. Everyone with Alpha access can start building without a separate developer application.

2. NEXT

   Reliability and developer feedback

   Broader fresh-install and multiplayer validation, reconnect and animation fixes, clearer diagnostics and improved hosting workflows.

3. THEN

   Compatibility and capacity

   Measure representative server workloads and hardware, reduce breaking changes, and document supported combinations as they are validated.

4. BEYOND

   The ecosystem

   Featured communities, server reputation, resource sharing between servers: the parts that only matter once real worlds exist. The community will shape these.

FAQ#

Still curious about running a world of your own? Create a Server covers what hosting will involve.