How Astrumis Co-Op Works for Two Players

Astrumis co-op support at a glance

Astrumis is not a game in which two players perform the same job in parallel. Its puzzles and survival systems depend on information being divided between the two roles.

What each player does

The co-op structure separates physical movement from surveillance. Neither player receives everything needed to survive alone.

The survivor

The first player controls John Kowalski aboard the abandoned spacecraft. This role uses a first-person perspective and handles direct interaction with the ship.

The survivor must:

• Move through corridors and rooms
• Repair damaged systems
• Interact with machinery
• Complete the physical side of co-op puzzles
• Follow directions from Mission Control
• Avoid the creature moving through the ship

The creature is invisible to the survivor. Sound, environmental changes and instructions from the second player become the main warning systems.

Mission Control

The second player controls Yang Sungbin from a remote station. Mission Control cannot walk alongside the survivor, but can access information unavailable to the person inside the ship.

Mission Control uses:

• Security-camera feeds
• Surveillance controls
• Motion information
• Ship systems
• Puzzle interfaces
• Communication with the survivor

The invisible creature can appear through the camera system even when the survivor cannot see it directly. Mission Control must therefore identify the danger, describe its location and help plan a route through the ship.

Why communication matters

Astrumis creates tension by giving each player incomplete information. The survivor understands the immediate physical space, while Mission Control has a wider but indirect view.

A useful callout needs to be specific. Saying that the creature is nearby may not help enough. Mission Control should describe the relevant corridor, camera, direction of travel and whether the safest route is still open.

The survivor must also report details that cameras cannot explain clearly. An interactable panel, blocked passage or puzzle state may require a description before Mission Control can identify the next step.

The design resembles the strict role separation of A Way Out, but applies it to surveillance and horror rather than a shared escape adventure.

How the invisible creature works

The creature is the central threat aboard the spacecraft. It is invisible to the survivor’s naked eye, preventing the player inside the ship from relying on direct visual confirmation.

Mission Control can reveal the creature through security cameras. That creates a repeating survival loop:

1. The survivor reaches a new area.
2. Mission Control checks nearby camera feeds.
3. The players establish the creature’s likely position.
4. Mission Control recommends a route or timing window.
5. The survivor moves, repairs a system or completes a task.
6. Both players update each other when conditions change.

The setup shares some of the pressure of Alien: Isolation, but the second player replaces part of the information normally provided by a single-player interface. The threat becomes a communication problem as well as a stealth problem.

Co-op puzzles and minigames

The official description states that the cooperative challenges cannot be completed alone. Each puzzle gives the two roles separate inputs or information.

One player may need to manipulate equipment aboard the ship while the other reads a remote interface. A solution can depend on timing, order, symbol matching or instructions that only one participant can see.

Before starting a puzzle, both players should establish:

• Which controls belong to each role
• Whether an action has a time limit
• What information is visible on each screen
• Which player will call the sequence
• How to reset after a mistake
• Whether the creature can interrupt the process

The horror does not pause simply because a puzzle has begun. Efficient communication reduces the time the survivor remains exposed.

Does Astrumis support solo play?

No solo mode is listed. Astrumis is described as exclusively cooperative and designed around exactly two people.

The Mission Control role is not presented as an optional companion or automated assistant. Removing either role would also remove information required by the other player.

Players wanting a horror game that supports solo investigation can consider Phasmophobia, which allows solo play as well as online co-op. Astrumis is the better choice when two-player role separation is the specific appeal.

How the Friend’s Pass works

Astrumis has a separate Friend’s Pass download on Steam. One participant owns the full game, while the invited partner installs the Friend’s Pass and joins the session.

Use this basic setup:

1. The owner installs and launches Astrumis - Survive Together.
2. The second player installs Astrumis - Survive Together Friend’s Pass.
3. Both players sign in to Steam and add each other as friends.
4. The owner creates or starts the online session.
5. The Friend’s Pass player joins through the invitation.
6. The pair chooses the survivor and Mission Control roles.

The Friend’s Pass is not a standalone single-player version. It exists to join a player who owns the full game.

If invitations fail, confirm that both downloads are updated, both Steam clients are online and the joining player installed the Friend’s Pass rather than looking for a second full-game license.

Does Astrumis support local co-op?

Steam lists online co-op, but not local co-op or shared-screen play. Plan for two PCs and two Steam accounts rather than one computer with two controllers.

The roles also use different interfaces simultaneously. Mission Control needs camera and system information while the survivor needs a first-person view of the spacecraft, making separate screens a natural fit for the design.

A voice connection is strongly recommended. Text chat would slow down urgent warnings, and the survivor may need instructions while moving or interacting with machinery.

Which player should choose each role?

The survivor role suits a player who prefers movement, first-person navigation and reacting under pressure. The role carries the immediate physical risk and depends on clear directions from the other screen.

Mission Control suits a player who prefers observation, communication and interpreting information. This player needs to monitor multiple feeds, identify the creature and give concise instructions.

For the first session:

• Give the survivor role to the more comfortable first-person player
• Give Mission Control to the person who communicates clearly
• Avoid talking over each other during a warning
• Agree on simple direction wording before danger escalates
• Swap roles later if both players want the other perspective

The two experiences are different enough that replaying with reversed roles can reveal information one player did not see previously.

How Astrumis differs from other co-op horror games

Astrumis is narrower than a repeatable investigation game or a squad survival game. It is built around a two-player campaign and a fixed division of perspectives.

Compared with Phasmophobia, Astrumis does not ask a group to identify a ghost across repeatable contracts. Compared with GTFO, it does not focus on a four-player combat squad. Compared with A Way Out or Split Fiction, it places more emphasis on an invisible threat and surveillance.

The result is closer to a cooperative communication test inside a linear sci-fi horror story. That focused structure is useful for pairs who want a complete campaign rather than a live-service progression loop.

System and account features

The Steam listing includes:

• Online co-op
• Steam achievements
• Steam Cloud
• Steam Family Sharing
• Xbox controller support

Family Sharing does not replace the Friend’s Pass setup for simultaneous cooperative play. A shared library copy normally remains one copy, while Astrumis requires two players in the same session. The Friend’s Pass is the supported route for the second participant.

Controller support is listed specifically for Xbox controllers. Players using another controller type should check Steam Input behavior before relying on it for the complete campaign.

What changed after the original announcement

Astrumis was announced for May 26, 2025 and released on that date. The earlier playtest and prerelease demo phase are no longer the current way to access the game.

The finalized Steam version includes the two-player campaign, the survivor and Mission Control roles, the invisible creature, cooperative minigames and the separate Friend’s Pass.

On May 26, 2026, the developer marked the first anniversary and announced a sequel. That sequel is separate from the released Astrumis - Survive Together campaign, so players should not treat sequel information as a replacement for the current game.

Tips before starting

A few preparations make the first session smoother:

1. Install the full game on the owner’s PC.
2. Install the Friend’s Pass on the second PC.
3. Test voice communication before entering the campaign.
4. Decide who will play the survivor first.
5. Use consistent names for corridors and directions.
6. Let Mission Control finish urgent warnings before the survivor moves.
7. Describe puzzle symbols exactly rather than guessing their meaning.
8. Update both versions before troubleshooting invitations.

Communication quality matters more than mechanical speed. A calm, precise description can be more useful than a fast reaction based on incomplete information.

Who should play Astrumis?

Astrumis is a strong fit for:

• Two regular co-op partners
• Players who enjoy asymmetric roles
• Fans of sci-fi horror and surveillance systems
• Pairs who communicate through voice chat
• Players looking for a focused campaign rather than endless progression
• Friends who want to share one purchased copy through a supported pass

It is a weaker fit for solo players, couch co-op users or groups larger than two. Players seeking replayable four-person horror should choose a different structure.

Astrumis co-op summary

Astrumis - Survive Together is a released two-player online co-op horror game. John Kowalski explores the spacecraft in first person, while Yang Sungbin controls Mission Control and uses cameras to track the invisible creature.

The game requires communication because neither role has complete information. One player needs the full game, while the second can join through the free Friend’s Pass. Local co-op and solo play are not listed, so two online PCs are the intended setup.