O4Online 404 Game Wiki
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Online: 404 on Steam

Play together

Online: 404 Multiplayer & Co-op

Online: 404 is built for solo play or online co-op with a team of up to four players — the same story campaign, the same district, shared. Here is exactly what is confirmed, and the one Steam tag that doesn't fit.

Up to 4 playersOnline co-opSolo supported
First-person view holding a pistol while a teammate aims a rifle at a figure in a doorway
Holding a room together in co-op — official Steam screenshot.

How many players, and doing what?

The developer's framing since the first announcement is "solo or in a team of up to four players", and the Steam feature list matches: single-player, multiplayer, co-op and online co-op are all listed. The game ships with in-game chat, and Steam flags it as having interactive (online) elements.

Two ways to play are presented side by side on the store page:

Survival systems all work in co-op: gathering, crafting, base building and reinforcement, hunting, farming, electricity, vehicle restoration and driving, and defending the base during raids.

The four characters

You pick one of four playable characters, each with unique stats and starting gear. In the June 2026 demo, the roster included Ethan, Wells, Derek and Olivia, with different daily calorie needs, carry weights and starting perks (for example, one started with medical supplies, another with charged batteries, another with stealth takedown experience, another with herbal and mushroom knowledge).

Demo-era detail: those names and numbers come from the June 2026 demo and may change in the Early Access build. What is officially confirmed is the structure — four characters, distinct stats, distinct starting equipment — not the exact values.

In a full squad, complementary picks matter: pairing a stealth-oriented character with a medicine-oriented one covers more of the team's needs than doubling up.

Is Online: 404 an MMO? The "Massively Multiplayer" tag

Steam's genre tags for the game include Massively Multiplayer, sitting right next to a developer-stated four-player cap. Both are on the same store page, and Cornfield Games has never explained the discrepancy — no larger session size, server population or shared-world mode has been described anywhere. The safe reading: confirmed multiplayer is 4-player co-op, and the MMO tag is unreconciled Steam metadata.

Dedicated servers, mods, crossplay

Setting up a squad on day one

  1. Everyone needs the game on Steam — it is the only storefront.
  2. Check the system requirements — 16 GB RAM and a 60 GB install are the floor.
  3. Pick complementary characters instead of four copies of the same build.
  4. Agree on first-session goals: food, a shelter, and learning the phone tools before deep expeditions. The beginner's guide covers the opening loop.
  5. Set up a voice channel of your choice for coordination.

Where these facts come from

Frequently asked questions

How many players can play Online: 404 together?

Up to four. The developer describes playing solo or in a team of up to four players, and the Steam feature list includes single-player, multiplayer, co-op and online co-op.

Is Online: 404 co-op story shared?

Yes. Co-op is built into the core game: a squad can progress the story campaign together or ignore it and roam the district, scavenge, build and defend a shared base.

Does Online: 404 have crossplay?

There is nothing to cross-play with: the game launches on PC (Steam) only, so every player in a session is on PC. No console versions have been announced.

Does Online: 404 have dedicated servers or mod support?

Neither is confirmed. No server browser, hosting guide or modding documentation has been published; third-party server hosts list both as not confirmed.

Is Online: 404 an MMO?

No. Steam carries a Massively Multiplayer genre tag alongside the four-player co-op cap, but the developer has never described large-scale sessions — treat the confirmed design as 4-player co-op.