How to Install Abiotic Factor and Join a Server

You are not the special forces operative sent in to clean up the incident. You are one of the people who was in the building when it happened, still wearing a lanyard, holding something you took off a desk because it was the heaviest object in reach.

That inversion is the entire pitch of Abiotic Factor, and it is why the game is funny and tense at the same time. An underground research facility has had the sort of accident that research facilities in games always have. The staff who survived it are scientists, technicians and administrators. Nobody trained for this. The vending machines still work.

Listings for it collect on the game's hub, which is where any community running a persistent world for it will appear.

What kind of game this actually is

It helps to know which shelf it sits on before you buy, because the screenshots could belong to three different genres.

It is a co-operative survival crafting game in first person, built for a small group rather than a server full of strangers. The facility is your world map: sectors of offices, laboratories, storage and machinery, connected by corridors and lifts, opening up as you find the means to reach further in. You scavenge it, you build a base somewhere defensible, and you go out again.

The crafting economy is the joke that turns into a system. Your materials are office chairs, keyboards, tape, batteries, mop handles and cafeteria trays. Early weapons are improvised in the literal sense — you are attaching things to other things because there is nothing better. Later the facility's own equipment becomes available and the tone shifts, but the early hours are genuinely about beating something to death with equipment requisitioned by an underfunded department.

It also tracks your needs more thoroughly than most survival games. Hunger and thirst you will expect. Fatigue you will expect. There is at least one more that will send you looking for a toilet, and the game is entirely sincere about it.

The debt to Half-Life is deliberate and unhidden — the setting, the corridors, the sense that the science was always going to go wrong. If that lineage is what drew you, the original Half-Life deathmatch servers are still running two and a half decades later.

Getting it

It is a Steam game. Buy it, install it from your Library, and let it finish. If you have never used Steam, the Steam beginner's guide covers making an account and securing it first.

The install is small by modern standards, which is a pleasant surprise after the last few survival games you probably tried. The files land in steamapps/common inside your Steam library folder, in a directory named for the game.

It has spent time in early access, and that is worth holding in mind rather than treating as a warning. Content, systems and balance have moved. A guide written a year ago will describe things that have since changed, this one included, and the game's own patch notes are the only authority on what is in it today.

Play the first session with the people you intend to keep playing with

This is the practical advice that matters most and it is not a technical point.

Abiotic Factor is built around a small group learning the facility together. Progress is shared, the base is shared, and the difficulty assumes a party rather than a crowd. Joining a session forty hours in, where three people already know where everything is and have opinions about the base layout, is a much worse introduction than starting cold with friends who are equally lost.

If you have nobody to play it with, start alone. It works alone. It is harder and quieter, and it teaches you the map, which makes you useful later.

How multiplayer works here, and what a server listing means

Most co-op survival games offer two shapes of multiplayer, and the difference decides everything about how a group plays.

A host session is one player's machine running the world while they play in it. Everyone else joins through them. It is free, it takes thirty seconds to set up, and it has one hard limit: when the host closes the game, the world closes with it. Nobody plays without them, nobody logs in for a quiet hour on a Tuesday, and the host's connection quality becomes everybody's connection quality.

A dedicated host is a machine whose only job is running the world. It stays up. People come and go on their own schedules, the base keeps existing, and no single person's evening plans hold the group hostage. This is what a listing on a server directory describes, and it is the reason a directory exists for a game that is fundamentally about six friends in a lab coat simulator.

For a group of four who play together anyway, a host session is genuinely fine and you should not overthink it. For a community that wants a world to come back to, it is not. Our writeup on what game server hosting costs covers the money side of that decision honestly, and where to host a server covers the part people forget, which is that the box should be near the players rather than near the person paying for it.

Joining

If you are joining a friend's session, the path is through Steam. They start the world, you find them in your friends list, and you join from there. This is the route most people use and it needs no configuration from you at all.

If you have been given a persistent server to join, you will have been given an address, and possibly a password. Enter it exactly as it was given to you, including the port after the colon — the number before the colon on its own will not find a server that is not on the default port, and hosts running several worlds on one machine cannot all use the default.

That is the single most common cause of "the server does not exist" in every game on this site, not just this one.

If a listing shows a server as online and you still cannot reach it, the problem is between you and the box rather than in the box. A password you were not told about, a whitelist you are not on, a version mismatch after an update. Ask in the community's chat before assuming anything is broken.

Version matching

Early access games update often, and your Steam client updates you automatically while a server updates when its owner gets around to it. A gap between the two produces a failed join with an unhelpful message.

There is nothing clever to do about this. Wait, or ask. It resolves itself when the host restarts.

Setting up your own

If you are the person who ends up running things — and in every group of six there is one — a few things are worth knowing before you commit.

Decide the player count honestly. This game is designed around a small party, and a world sized for six that regularly has two people in it feels empty in a way a large survival sandbox does not. How many slots a server actually needs makes the general argument, and it applies with more force to a co-op game than to a battlefield.

Decide what happens to progress. Shared worlds accumulate. A world that has been running for three months has a fully built base, all the sectors open and nothing left to discover, and it is a hostile place for a new player to arrive. Groups solve this by starting fresh worlds periodically, which sounds like a loss and is actually the thing that keeps a small community playing.

Back it up. A save file on one machine with no copy is not a save file, it is a countdown. This is the least glamorous advice in this guide and the one most likely to matter.

What a first evening actually looks like

Setting expectations, because the pace of this game is not the pace of the trailers.

You will spend the first hour lost and under-equipped, and that is the design rather than a failure. The facility is a maze on purpose and the map does not hold your hand. Somebody in the group will find a route to somewhere useful, somebody else will die to a thing they poked, and the party will end the session with a small pile of scavenged material and a room they have decided is theirs.

The second session is where it starts to open. You have somewhere to come back to, you have worked out which of the improvised tools is worth carrying, and the facility begins to look like a place with a layout rather than a set of corridors. Groups that push straight for the next sector before setting up a base tend to lose everything and have to walk back.

Split the jobs. One person paying attention to the group's needs, one person hoarding materials, one person actually mapping where you have been — that division emerges naturally in every group that gets anywhere, and doing it deliberately saves an evening.

And take the humour seriously. This is a game where the horror and the office comedy are the same joke, and a group that leans into it enjoys it considerably more than one treating it as a survival optimisation problem.

Problems on a first run

Nothing to fight with and something hunting you. Working as intended. Run. The early game expects you to avoid rather than win, and the facility has more doors than it first appears.

You cannot get into a sector. Progression gate rather than a bug. Something you have not found yet opens it.

Performance dips in built-up areas. A heavily constructed base with a lot of placed objects is the usual cause, in this game and every other one that lets you build.

Your friend cannot join your session. Check that you are actually hosting rather than in a private world, and that they are joining through Steam rather than typing an address. Home connections and consumer routers are a common obstacle for anything that expects an inbound connection, and it is not something the game can fix for you.

The world you joined has moved on without you. Not fixable, and worth saying out loud: shared survival worlds reward attendance. If your group plays without you on Wednesdays, Thursday will feel strange.

If this is the kind of game you want more of

Abiotic Factor sits in a small category of co-op survival games with a sense of humour and a specific place rather than a generic wilderness. Barotrauma is the closest relative in spirit — a submarine crew, systems that fail, and disasters that are usually somebody's fault. Project Zomboid shares the scavenging and the slow accumulation of small advantages, played much crueller. Sons of the Forest and Valheim take the same co-op building loop outdoors.

For the Half-Life half of the appeal rather than the survival half, Half-Life 2: Deathmatch is still populated by people who never left that engine, and how to find a server worth staying on applies equally to all of them.

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JoinGG is a live directory of community game servers. Every listing is queried directly every fifteen minutes, so the player count you see was measured rather than reported by its owner, and each one carries a copyable connect address. Abiotic Factor servers are listed here, and every game on the site has its own hub. Player counts across every game are on the statistics page.