Main Sequence co-op guide and crew planner

The public material presents co-op as the same industrial sandbox, with more captains able to operate ships and stations — not a separate competitive mode. The developer’s examples split work between logistics, defense and exploration, but the game does not appear to enforce classes or a single shared role.

During the September 2026 playtest, multiplayer was explicitly experimental, with performance and stability called an ongoing focus before Early Access. The October demo update improved multiplayer, but it is still not a finished competitive or dedicated-server product.

What is confirmed

What is not confirmed

These are the questions we cannot answer from official material. They are not gaps in the game; they are gaps in the public information:

• Maximum player count. No public cap has been announced.
• Dedicated servers. They have not been mentioned in the store description or launch announcements.
• Cross-play. No cross-platform details have been published; the confirmed launch platform is Windows/Steam.
• Host migration and save ownership. No official explanation of what happens if the host leaves or how progression is stored.
• Shared versus separate progression. The demo is the current reference, not a final rule set.
• Mods and blueprints in multiplayer. Blueprint sharing is advertised as a general feature, but multiplayer compatibility is not documented.

How to start a co-op session

The exact lobby flow is not documented in the public patch notes, so we will not invent a menu path. The reliable starting point is:

1. Install the current Main Sequence demo.
2. Open the demo’s multiplayer or co-op menu. The October 19 update is the version that added the mode; an older local build may not show it.
3. Decide whether you are using Steam’s online path or a LAN session. Both are listed as features on the store page.
4. Before inviting a group, run a short session with one other captain to confirm chat, ship access and station permissions in your build.

The demo’s exact player cap and host settings are not public. If the interface shows a cap, that is the practical limit for that build, not necessarily the final Early Access limit.

A sensible first-session goal

Do not start a mega-project on the first co-op night. Complete one shared objective: a powered station, one working belt loop or a safe mining run. That gives everyone a common point of reference and exposes logistics problems early.

Role strategy for two to four captains

Two captains: one base, one frontier

One player owns logistics and production while the other handles defense and exploration. This is the cleanest split because it gives the base a dedicated operator and keeps the fleet from sitting idle. Rotate after the first session so both players learn the other side of the game.

Three captains: protect the middle

A dedicated logistics captain, a production captain who also watches defense, and an exploration captain works well. The production/defense overlap is deliberate: a factory that cannot respond to a threat is a factory that will eventually stop.

Four captains: one primary lane each

With four players, assign one primary lane per captain: logistics, production, defense and exploration. Have each captain write down their first objective and what they need from the others. The clean split reduces duplicated ships and half-built production lines.

What every captain should know

• Where the station’s power comes from.
• Which dock or storage area is receiving shared cargo.
• What the current research goal is.
• How to call for help when a combat alert starts.
• Which personal ship is theirs, and where it is parked.

The planner is an editorial aid. It does not set in-game permissions or enforce classes. Every crew will need to adapt to its own station layout.