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The sun is dying. One billion minds sleep below. You are HALCYON, the caretaker AI — dismantle a solar system, planet by planet, to build them an Ark. An incremental that ENDS: 4-6 hours, two endings, no infinite grind. Every world you consume stays gone. Even the Earth. Especially the Earth.
PC (Microsoft Windows) · Jul 30, 2026
Worldwide · Exact date · Full release · IGDB
Catalog sources
20 achievements available.

Every sleeper aboard the Ark.
LockedSteam

Build the first Ark segment.
LockedSteam

All 300 Ark segments built.
LockedSteam

Reach 150 Ark segments.
LockedSteam

Hear the Choir for the first time.
LockedSteam

Consume CINNABAR entirely.
LockedSteam

Field ten hauler drones at once.
LockedSteam

Field one hundred hauler drones.
LockedSteam

Hidden until unlockedSteam

Hidden until unlockedSteam

Consume FERROS entirely.
LockedSteam

Catch a passing comet.
LockedSteam

Catch your first fissure eruption.
LockedSteam

Retool for the first time.
LockedSteam

Catch a solar flare bare-handed.
LockedSteam

Hand-melt Regolith at the refinery.
LockedSteam

Consume MERIDIAN entirely.
LockedSteam

Begin again, remembering.
LockedSteam

Retool five times.
LockedSteam

Consume THALASSA entirely.
LockedSteam
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