How to Play Co-op in Subnautica 2

Subnautica 2 has native online co-op — no third-party patch, mod, or crack is needed. This is the first game in the series to feature official multiplayer. You can play through the entire game in co-op right from Early Access launch.

Player Count

Up to 4 players: you plus up to 3 friends.

Does It Need a “Multiplayer Patch”?

No. Subnautica 2 supports co-op out of the box.

Unlike some games that release without multiplayer and later rely on community-made patches, Subnautica 2 has built-in co-op as a core feature. If you see a third-party site offering a “Subnautica 2 co-op patch” or “联机补丁,” it is either outdated information carried over from the original Subnautica (which did not have official co-op) or a scam. The feature is already in the game.

To start, just open the in-game multiplayer menu — no external tools needed.

Supported Platforms

Crossplay works between all supported PC and Xbox platforms. Save files and progression are shared within a session but are not transferable between platforms.

Host a Co-op Session

1. Make sure your game is updated to the current version.
2. Open the multiplayer menu from the main screen.
3. Choose the host option.
4. Start or load the world you want to play in.
5. Invite friends from your platform friend list, or share the in-game Friend Code if the friend does not appear in your list.

The host’s connection quality affects all players — a stable internet connection with UPnP enabled is recommended.

Join a Friend

1. Make sure your game is on the same version as the host.
2. Open the multiplayer menu.
3. Use the join option if the host appears in your friend list.
4. If the host does not appear, use the Friend Code option and enter the code shown on the host’s screen.
5. Join while the host session is still open.

Session Checklist

Before inviting friends, confirm these:

• Same build — all players must be on the same current version. Version mismatches are the most common cause of connection failures.
• Friend list or Friend Code — try the platform friend list first, then use the in-game Friend Code fallback.
• Host first — the host starts the session, then sends invites.
• Network — the host should have a stable upload connection. NAT issues can prevent friends from connecting; enabling UPnP on the router or using a game VPN/accelerator may help.

Architecture Notes

Subnautica 2 uses peer-to-peer (P2P) hosting rather than dedicated servers. This means:

• The host’s internet connection carries all gameplay traffic.
• If the host disconnects, the session ends for all players.
• NAT type on the host’s network can affect whether friends can connect.

For the best experience, the host should have a wired internet connection with UPnP enabled on their router. If UPnP is not an option, manually forwarding ports may help (consult your router documentation).

Upcoming Co-op Features (Roadmap)

The next major Early Access update, EA 1.2, focuses on co-op enhancements. Planned features include:

These features are on the development roadmap and may change before release.

Solo vs Co-op

Troubleshooting

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