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Reignite a dead sun. Rebuild its worlds. Your only companion is P.O.R.T.I.A., a caretaker AI who has been alone for a very long time, and who remembers more than she should. A story rich idle game about grief, patience, and second chances, told over generations of stars.
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Match strength key:80+65+50+<50Stellar Nursery
SteamAbout Stellar Nursery
The system is dark. You are the spark.
Something ended here. The sun is cold, the planets are empty, and the only voice left is P.O.R.T.I.A., an ancient shepherd intelligence who has kept the watch alone for longer than she can bear to say. Together, you will reignite the star, gather stardust, and coax nine worlds back to life.
She will guide you. She will keep you company. And sometimes, when she thinks you are not listening, she will let something slip.
Nurture a solar system, not a spreadsheet Condense nebulae, harvest falling stars, and grow Earth from barren rock to a world of billions. Found a colony on Mars. Send probes into the dark past Jupiter. Every world has its own character, and every generation of your star carries something forward.
An AI companion with a past She comments on what you build, remembers what you lose, and doles out her story one transmission at a time. Her logs, her puzzles, and her secrets are yours to uncover. Some of them she buried on purpose.
Play it your way Active or idle, it respects your time. Leave it running while you work and come back to a welcome report of everything she watched over while you were gone. No microtransactions, no timers you can pay to skip. Ever.
Also aboard the station A playable piano, a harmonograph that draws your worlds, sealed ciphers, hidden songs, constellations to chart, 57 unlockable visual themes, and a novella that unlocks as you progress to tell you the story of what happened before P.O.R.T.I.A. came back online.
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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