Research summary
Subnautica 2 is officially positioned as a single-player-first survival adventure with optional online co-op for up to four players total. Official store and platform pages confirm online co-op, cross-platform multiplayer, Xbox cross-platform co-op, PC/Xbox play support, and no local/split-screen feature listing. The strongest content angle is a clear player setup guide: who can play together, how many players can join, how invites work, whether couch co-op exists, and what is still unconfirmed during Early Access.
- Max players: 4 total, meaning one host plus up to three friends.
- Mode: optional online co-op; solo play is fully supported.
- Crossplay: official sources confirm cross-platform multiplayer/co-op across supported PC/Xbox ecosystems, but every exact storefront pair should be labeled with confidence.
- Split-screen: no official split-screen/local co-op listing was found [uncertain].
- Friend Pass: no free Friend Pass or guest pass has been announced [uncertain].
- Copy requirement: plan for every player to have their own game entitlement or Game Pass access on a separate device/account [uncertain].
Confirmed facts
Facts below are drawn from official or high-confidence sources and should be prioritized above community reports.
- Subnautica 2 supports solo play and optional online co-operative multiplayer with up to three friends, for four players total.
- Steam lists the game with Single-player, Online Co-op, Cross-Platform Multiplayer, Steam Cloud, and Family Sharing features.
- Xbox lists Online co-op (2-4), Online multiplayer (2-4), Xbox cross-platform multiplayer, Single player, Xbox cross-platform co-op, Xbox cloud saves, and Xbox Play Anywhere.
- Xbox lists playable platforms as PC, Xbox Series X|S, and handheld devices.
- Xbox Wire states that players can invite Xbox friends and friends on other platforms from the menu.
- Unknown Worlds' multiplayer dev vlog announcement says the team discusses co-operative multiplayer and cross-play functionality, including Steam Deck and ROG Xbox Ally series support.
- The game is explicitly described as a single-player experience that can optionally be played online in co-op.
- Early Access launched on May 14, 2026 at $29.99 USD, and official news says one Early Access purchase includes additions, updates, and hotfixes up to 1.0 and beyond.
Content modules to include
These modules translate the keyword research into page sections, tables, tools, and update surfaces.
- Quick answer: multiplayer model, max players, and online-only framing.
- Co-op basics: solo-first design, optional online co-op, four-player cap.
- Platform compatibility matrix: Steam, Epic, Microsoft Store PC/Game Pass PC, Xbox Series X|S, handhelds, Steam Deck, and ROG Xbox Ally.
- Crossplay explanation: official confirmation and platform-pair confidence levels.
- Split-screen/local co-op answer: no official local co-op listing, online co-op only based on store capabilities.
- Friend Pass and copy requirements: what is announced, what is not, and practical buying advice.
- Invite flow: host multiplayer, join friends, in-game friends/friend code, and platform friends flow.
- Save and ownership notes: host-owned world, solo-to-co-op conversion, and drop-in/drop-out behavior [uncertain].
Unconfirmed or changing details
Use [uncertain] for any claim not directly stated by Unknown Worlds, Steam, Xbox, Epic, or an in-game screen captured after launch. For spending-related advice, separate confirmed facts from practical recommendations. Do not state unsupported platform pairs, Friend Pass absence, split-screen absence, dedicated server absence, or copy requirements as absolute unless an official source explicitly confirms them.
- [uncertain] No official page found that explicitly says 'no split-screen'; the conclusion is based on official feature lists showing online co-op but not local co-op, couch co-op, split-screen, or shared/split-screen multiplayer.
- [uncertain] No official Friend Pass, free guest pass, or trial-for-friends feature was found; treat Friend Pass as not announced rather than definitively impossible.
- [uncertain] Each online co-op participant likely needs their own entitlement or Game Pass access on their own account/device, but no official FAQ wording was found that states 'each player needs a copy.'
- [uncertain] PC storefront pairing details are partly inferred: Steam confirms cross-platform multiplayer and Xbox confirms cross-platform multiplayer/co-op, but official copy does not enumerate every pair such as Steam-to-Epic, Steam-to-Xbox, Epic-to-Xbox, or Microsoft Store PC-to-Steam.
- [uncertain] Dedicated servers, public matchmaking, LAN-only play, in-game voice chat, private storage, friendly fire, resource scaling, and host migration were not clearly confirmed by official sources.
What this page answers
Cross-platform multiplayer support between Steam, Epic, Xbox, and Game Pass ecosystems.
- Short answer first
- Confirmed facts separated from community reports
- Links to related launch, guide, and wiki pages
How to use it
Use this page as a quick decision point, then follow related pages for deeper walkthroughs, troubleshooting, or wiki entries.
