How to Install Killing Floor 2 and Join a Server

The best moment in Killing Floor 2 is not a kill. It is the sixty seconds after a wave ends, when the trader horn goes off, a green arrow appears in the air, and six people who were calmly holding a corridor turn into a panicking crowd trying to reach a shop that is on the far side of the map.

Somebody always leaves it too late. Somebody always spends everything on a weapon they cannot carry the weight of. Somebody always shouts that they are dumping money to the medic and then does not.

Then the doors close and the next wave starts, larger than the last. That loop has kept the game going for a decade, although the community-hosted side of it has never been crowded — one server is listed here as this is written.

What the game is

Six players against escalating waves of engineered horrors, on maps built around chokepoints and welded doors, ending in a boss fight that will kill your whole team the first several times you meet it. That is the entire structure, and it has not needed changing.

The game runs on Unreal Engine 3, which by now means it will run on almost anything, and it is unusually generous with gore — bodies come apart in pieces along whatever line you cut them, and the game slows down to show you when the cut was good.

That single listing is a very thin population, and it is worth being straight about why before you spend an evening hunting for more.

Why the community server list is short

Killing Floor 2 shipped with matchmaking, and matchmaking is where most of its players go. You press a button, the game finds five other people, and you are dropped onto a server you never chose and will never find again.

That works. It is also the reason the community-hosted side of this game is much quieter than it is for older co-op shooters, where a server list was the only door in. The people still running dedicated Killing Floor 2 servers are running them for a reason — a specific difficulty setup, or a group of regulars who got tired of strangers leaving on wave two.

Those servers are worth finding precisely because there are few of them. A quick-play match is six strangers. A community server is the same forty people, which in a co-op game is a completely different experience.

Perks, and picking one that suits you

You do not pick a class at spawn. You pick a perk, it levels independently of the others, and it levels by doing the thing that perk is for. Heal people and the medic goes up. Weld doors and carry the team's ammunition and support goes up.

There are ten of them, and they are not interchangeable.

Field Medic carries a dart gun that finds teammates on its own, plus the responsibility for everyone else's mistakes. On the higher difficulties, a team without a competent medic does not finish a long game.

Support welds doors and carries shotguns. It also hands ammunition to everyone else, which is why the perk is worth more than its damage numbers suggest — a welded door is a wave funnelled somewhere you want it.

Commando shreds the small stuff and reveals invisible Stalkers to the whole team, which is a support function disguised as an assault rifle.

Berserker is melee. It takes less damage from close range and is the perk you play when you want to be the thing holding the door shut rather than the thing shooting through it.

Sharpshooter and Gunslinger are both precision perks aimed at heads — one slow, one fast. The Gunslinger's pistols are much better than they look.

Demolitionist deletes crowds and, if you are careless, your own team.

Firebug does damage over time and blocks corridors with burning ground.

SWAT carries submachine guns and is built to stay standing in the middle of a crowd.

Survivalist does a little of everything. It sounds appealing, and it is the perk most people abandon once they have worked out what they actually enjoy.

Level one perk properly rather than four badly. Perk levels unlock the abilities that make the difference on Suicidal and above, and a level five medic on a hard server is a liability nobody will say anything about but everyone will notice.

The Zeds you need to recognise on sight

Most of what walks at you is disposable. Clots grab you and hold you in place — that is their whole job, and being grabbed while a Fleshpound is inbound is how most deaths start. Crawlers come along the ceiling. Gorefasts run in a straight line with a blade. Stalkers are invisible until they are not.

Four of them decide whether your team survives.

Bloats vomit corrosive bile that blinds your screen and keeps damaging you. Kill them at range, and never with a melee weapon if you can help it.

Husks throw fireballs across the map and will hit you through a doorway you thought was safe.

Sirens scream, and the scream destroys grenades and rockets in the air. A Demolitionist who has not learned to kill Sirens first is throwing money away.

Scrakes and Fleshpounds are the pair that end runs. Both enrage — the Scrake when it is hurt enough, the Fleshpound when it takes heavy damage too quickly or gets blocked — and an enraged one crosses a room faster than you can back out of it. Coordinated teams designate who kills them and everyone else stays out of the way. Uncoordinated teams all shoot at once, enrage it in the middle of the group, and lose three players in four seconds.

Zed Time is the game's other rhythm. Certain kills trigger a few seconds of slow motion for everybody, and perks have abilities that only fire during it. Good players save something for that window.

Difficulty is not a suggestion

Normal is a tutorial. Hard is the game. Suicidal expects you to know the maps and the enrage thresholds. Hell on Earth expects that plus a team that talks.

Server browsers list difficulty and length, and both matter. The short game length is a lunch break. The long one is a genuine time commitment, and joining a long Hell on Earth game as a low-level perk means either carrying nothing or being carried, neither of which is much fun.

Some community servers go past what the difficulty menu allows, using server-side mods that raise spawn counts and change what turns up in each wave. Those servers say so in their names, and they are aimed squarely at people who have finished Hell on Earth and want the numbers turned up further.

Installing it

Killing Floor 2 is a Steam game and installs the ordinary way. Find it in your Library and click Install. If Steam is new to you, our Steam installation guide covers making the account and locking it down.

There is no separate launcher and no account to create beyond Steam itself.

Run it once before you go looking for servers. The first launch does shader work and settings detection, and the last thing you want is that happening while five people wait for you on wave one. Set your difficulty preference while you are there, and check your audio too, because directional sound is genuinely load-bearing in this game — Sirens and Husks announce themselves before you see them.

Finding a server rather than being assigned one

The in-game browser is under the multiplayer menu, and its default filters hide a great deal. That is the first thing to fix. Widen the filters — difficulty, game length, mode, whether custom content is allowed — before you conclude that nothing is running, because the browser will happily show you an empty list while servers are up.

The Steam client has its own server browser as well, under the View menu, with a favourites tab that accepts an address directly. That is the reliable route when the in-game list is misbehaving.

The list on this site queries servers directly rather than repeating what an owner typed into a control panel, so what you see is measured. That distinction matters more than it sounds — we wrote about what makes a listing trustworthy, and inflated player counts are the oldest trick in server hosting.

To join directly rather than through a browser, you need the full address including the port. Copy both halves. A host running several Killing Floor servers on one machine cannot give them all the same port number, so the default is frequently not the one you want.

Server size

The standard game is six players. Server owners can raise that, and some do, which produces a game that stops resembling careful chokepoint defence and starts resembling a riot.

Bigger is not better here. The maps were built for six, the trader run was timed for six, and a twelve-player server on a small map is chaos with a lower difficulty curve than the number suggests. If you are considering running one yourself, how many slots to give a server is worth reading first — the KF2 answer is almost always "fewer than you think".

Custom maps and the first join

Community servers run custom maps, and those come from the Steam Workshop. Expect the first connection to a server running one to take noticeably longer than the second, while the content comes down.

Nothing is wrong. Leave it. This is a per-map cost rather than a per-join cost, and once a map is on your machine it stays there.

If a server refuses you outright for a missing map, that is the server's download configuration rather than anything you can fix from your side.

Problems that come up

Everybody dies on wave one of a high difficulty. Somebody joined at a perk level the server was not built for. This is not a bug. It is a mismatch, and the fix is a lower-difficulty server for a few hours.

You cannot see the trader. Follow the arrow, not the map. The path is not always the one you walked in on.

Your weapon will not fit. Every weapon has a weight and you have a limited total. Selling something is part of the trader loop, not a failure state.

A Fleshpound crosses the room and everyone dies. Someone shot it while it was walking. Do not chip at them.

Grenades vanish mid-air. A Siren screamed. Kill the Siren.

The server browser shows nothing. Filters. Always filters.

If you want more of this

Killing Floor 2's ancestor is still around. Killing Floor is slower and uglier, and in some ways nastier. It ran on a community-server model from the start, which means the servers that survived have been running for years with the same people on them.

Left 4 Dead 2 and the first game trade wave defence for a directed sprint between safe rooms. Both kept community server populations that never went away, and both cost very little for how many hours they absorb.

If what appeals is holding a corridor with strangers who are shouting useful information at you, our guide to finding decent servers is the general version of everything above.

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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. Killing Floor 2 servers are listed here, and every game on the site has its own hub. Player counts across every game are on the statistics page, and Killing Floor 2's own numbers — servers online, players now, activity by hour — are on its statistics page.