Seafarer supports co-op for up to four players. The developer says teammates can share duties aboard a ship and complete missions together. Cross-play and exact session-joining steps are 待确认 in the official material reviewed here.
Co-op availability
The August 2026 Co-op Crew Update made multiplayer accessible. The official game site describes solo play or a crew of up to four players, with shared onboard duties and coordinated missions. These are current feature statements, not a claim that every single-player activity supports co-op. Check the mission's current UI before assuming it is eligible.
Shared ship work
The game site lists cargo, rescue, firefighting and patrol work as core activities. The full-release log describes fixes to multiplayer cargo, drones, inspections, weather, vessel physics and onboard interactions. It also improved fast travel behavior for multiplayer clients. Those changes suggest why a current-version guide matters, but they do not establish a fixed role for each teammate.
Which missions support co-op
The official pre-release announcement describes selected cargo operations, firefighting and rescue missions among the shared activities. The August update says players can complete curated missions together. These word choices matter: neither source promises co-op for every campaign mission or every Free Trade operation. Confirm mission eligibility in the current game rather than treating the overall four-player feature as universal coverage.
Session issues and current fixes
The full-release changelog lists fixes for docking synchronization, late joining and fast travel for clients. It also improved the replication of cranes, crew, horns, ship physics and weather. Older forum reports about one of these behaviors may describe a pre-release build. A current issue report should identify the host, client, mission and platform before suggesting a workaround.
The same release fixed crashes around the rescue net, drone use and some mission transitions in multiplayer. That does not guarantee a session will be free of bugs, but it makes older crash advice version-dependent. If an interaction fails, compare the build date with the update log first. The exact steps to reproduce or resolve a new failure are 待确认.
What is still unknown
The cited official pages do not specify a complete cross-platform matrix or a universal invite procedure. They also do not document host migration or whether every campaign mission can be completed together. Such claims should be tested with the current PC and console builds before being published as instructions. Until then, these points remain 待确认.
Evidence
The official game site confirms the four-player limit and shared duties. The update log confirms the co-op launch and later fixes. No unsupported cross-play promise is made here.