Is Subnautica 2 Cross Platform? Crossplay and Co-op Guide

01

Subnautica 2 crossplay and co-op at a glance

02

Which platforms can play together

You can buy Subnautica 2 on Steam, the Epic Games Store and Xbox. On Xbox it is a Game Preview for Xbox Series X|S and Windows PC, and the Xbox store also lists Xbox Cloud Gaming and handheld play, with Xbox Wire singling out the ROG Xbox Ally. The Steam version is Windows only.

The crossplay evidence comes from several official places. In the Xbox Wire post, Unknown Worlds programmer Sam Dark says you can invite Xbox friends and friends on other platforms straight from the in-game menu. Steam's feature list includes Cross-Platform Multiplayer, the Xbox store's capability list includes cross-platform multiplayer and cross-platform co-op, and the Buddy System update added cross-platform proximity voice chat.

So is Subnautica 2 crossplay on every store? The official sources don't publish a full pairing chart. None of the crossplay statements this guide found names the Epic Games Store version, so Epic-to-Steam and Epic-to-Xbox sessions are treated as unconfirmed here. The Xbox store lists Xbox Play Anywhere and Xbox cloud saves, and its install terms cover your home Xbox console and a Windows PC. Moving a save between a Steam copy and an Xbox copy is not documented.

03

Subnautica 2: how many players, and is there a dedicated server?

Subnautica 2 multiplayer supports up to four players in one world. The Steam description calls it 4-player co-op, the Xbox store lists online co-op for 2 to 4 players, and the official launch post invites you to explore alone or with up to three friends. The studio describes the game as a single-player experience with optional online co-op, so solo play works everywhere.

If you were hoping for a Subnautica 2 dedicated server, there isn't one yet. The official wiki says only peer-to-peer hosting is available and that hosting a dedicated server is not yet possible. The host creates or loads the world from their own save list, and no official source describes a way for friends to keep that world running while the host is offline. Neither the roadmap nor the patch notes through Hotfix 2 announce dedicated servers.

Two more rules come from the wiki. The game mode, Survival or Creative, is picked when a save is created, can't be changed afterwards and applies to everyone in that world. The wiki also notes that a world can be converted between multiplayer and single-player, but says the side effects on the save are unknown.

04

How to host or join a co-op game

The official wiki's Main Menu page, the Xbox Wire post and the patch notes describe this flow:

1. Pick Host Multiplayer on the main menu to create a new multiplayer world or load an existing one.
2. Invite your friends from the in-game menu. On Xbox, the developers say multiplayer was built to work with the Xbox friends list.
3. Friends can instead use Join Friends, which lists friends playing on multiplayer worlds and lets you join them or add new friends.
4. Each player picks a character. Update 1.2 added Jegna and Grace to the original four pre-designed characters.

On an Xbox console, the Xbox store says online multiplayer requires Game Pass Essential, Premium or Ultimate, sold separately. Since update 1.1 the game shows a notice screen on Xbox when someone without Game Pass opens the multiplayer menu or tries to join an online session. If you use the opt-in Experimental branch, the wiki notes that multiplayer only works when everyone is on Experimental, and saves don't carry over between branches.

05

What co-op players share and what stays personal

According to the wiki, databank entries, blueprints and progression are shared by everyone in the world, so a blueprint one player unlocks is there for the whole group. Bases are part of that shared world, and non-host players can build and rearrange them; update 1.2 and its first hotfix fixed several problems with clients moving furniture and Growbed items.

Some things stay personal. Your inventory is your own, and items change hands through trading. Each player respawns at their own assigned Biobed. Patch notes also treat the Pressure Tolerance Adaptation as something every player has to earn, because updates 1.1 and 1.2 closed ways to skip it by following someone who already had it. Since 1.1, audiologs no longer auto-play, so one player can't set them off for everyone: you get a notification, and a replay from the PDA plays only for you.

06

Buddy System features: voice chat, revives, emotes and trading

Update 1.2, Buddy System (August 19, 2026), delivered the co-op improvements the roadmap promised for the second update:

• Proximity voice chat: works across platforms and gets quieter as players move apart. The wiki's Settings page lists Always On (the default), Push To Talk and Always Off, plus a volume slider, and the game uses your system's default microphone. Hotfix 1 fixed a push-to-talk input issue and Hotfix 2 improved voice activity detection.
• Revives: when a player's health hits zero in a world with other players, a "Print loss imminent" notice and timer appear, per the wiki, and a teammate who reaches them before the timer runs out can revive them by interacting with them. Revived players keep their equipment and get a little oxygen back, or the downed player can reprint at their Biobed straight away.
• Emotes: Wave, Clap, Thumbs Up, Thumbs Down and Frustrated, chosen from a radial menu that the wiki says opens with the G key, in water or on land.
• Trading: interact with another player to swap inventory items directly. Since Buddy System Hotfix 1, inventory sharing is blocked while you ride in a Tadpole.

A profanity filter for multiplayer is on by default in Settings, and update 1.1 added an option on Xbox to report other users in multiplayer.

07

Troubleshooting co-op with the official patch notes

The official patch notes, including Buddy System Hotfix 2, don't publish a version-matching rule for co-op; the only branch rule comes from the wiki's Experimental branch page, so this guide doesn't claim one. What they do say adds up to a sensible checklist:

• Get everyone updated. Hotfixes can take time to roll out worldwide, and earlier notes say Xbox builds arrive once they clear certification. If Steam doesn't show an update, the 1.2 notes suggest restarting Steam.
• Check the branch. Experimental is opt-in on Steam and Xbox, and its saves are stored separately from main-branch saves.
• Turn off mods after a patch. Recent hotfix posts ask you to disable or remove mods until their creators update them; the mods guide has more.
• Check Xbox accounts. Console players need a qualifying Game Pass tier. Update 1.2 fixed a broken Friends List screen for Microsoft child accounts whose cross-network permission is set to Blocked, so that family setting is worth checking for younger players.
• Retry invites on the latest build. Update 1.2 fixed a bug where rejecting an invite stopped new invites arriving, and Hotfix 4 fixed an Xbox crash when joining a session invite.

Steam lists a broadband internet connection in both its minimum and recommended specs; the rest of the hardware list is in the system requirements guide. If something still breaks, report it through the in-game feedback tool, which can attach a save file since update 1.2.

08

What's not confirmed yet

Dedicated servers, a PS5 or Switch version, a crossplay chart that includes Epic and save transfers between stores are all unannounced or undocumented as of October 17, 2026. The roadmap's next big drop lists world, biome, creature, resource, tool, vehicle and story additions and doesn't mention servers. Follow new patches in the updates and roadmap guide, check release status in the Early Access guide, and if you're starting a fresh co-op world, the beginner's guide is a good first stop.