Starseeker: Astroneer Expeditions Launches Early Access June 11, 2026 — Cross-Play Co-op Exploration

Starseeker: Astroneer Expeditions launched into Early Access on June 11, 2026 on PC (Steam), Xbox Series X|S, PS5, and Nintendo Switch 2. The game was a day-one addition to Xbox Game Pass Ultimate and PC Game Pass.

Developed by System Era Softworks and published by Devolver Digital, Starseeker is a standalone co-op multiplayer experience set in the Astroneer universe — but with a focus on structured expeditions rather than pure sandbox building.

What Is Starseeker?

Unlike the original Astroneer (which is an open-ended sandbox), Starseeker is a cooperative expedition game where players work together on the ESS Starseeker station to visit different planets, complete objectives, and unlock new technology.

Key features:

• Cross-play and cross-progression across all platforms
• Up to 4-player co-op
• Planet-wide objectives — complete goals before the station moves to the next destination
• Tech tree progression — collect and unlock tools and upgrades
• Steam Deck verified — playable on Valve’s handheld

Early Access Roadmap

System Era has promised monthly updates through at least the end of 2026. The roadmap includes:

• New planets and biomes
• Additional expedition types
• More tech and unlockable items
• Community-requested features and polish

Game Pass Availability

Starseeker is included in Xbox Game Pass Ultimate and PC Game Pass from day one. This makes it easy to try without committing to a purchase.

How It Differs From Astroneer

Feature	Astroneer	Starseeker
Primary focus	Sandbox creation	Guided expeditions
Structure	Open-ended	Mission-based with objectives
Progression	Player-driven	Tech tree unlocks
Sessions	Persistent world	Station moves to new planets

If you enjoyed Astroneer’s terrain deformation and exploration but wanted more structure and co-op objectives, Starseeker is designed specifically for you.

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Sources: Thurrott — Game Pass June 2026, MMO.net, GameWatcher Patch Notes