An unofficial urban life simulator where your choices shape your story
A hard sci-fi idle game evolving from the Big Bang to an interstellar civilization
Stage
Not given
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Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free with no ads; optional Supporter: $2.99/mo, $19.99/yr, or $29.99 lifetime; time crystal packs: $1.99 (Skip a night), $4.99 (Skip a wall), $9.99 (Skip a week)
Key features
Six neighborhood systems with different starting conditions
Five tracked attributes: health, sanity, resources, connections, reputation
Multiple career paths to explore
Adjustable game speed from pause to 32x
Local browser-based saves with export and import
Offline play after initial load
Seeded replay system for reproducible lives
Multiple language support: English, Chinese, Japanese, Korean
Share cards that record life achievements and attributes
Life archives tracking every decision and season
13.8 billion year cosmic timeline from Big Bang to interstellar civilization
118 sourced research cards with scientific citations
12 game eras spanning Cosmos, Life and Civilization
16 different endings
12 civilization channels inspired by science fiction and real concepts
Playable on phone, desktop and iPad with cloud save sync
Installable on phone home screen for offline play
No ads and completely free to play
1,400+ nodes each grounded in real science with sources
Physics-accurate simulation where 1 light-year equals 1 real hour
What makes it different
Completely free with unlimited replays and no sign-up required
Deterministic seeded simulation allows perfect replay and comparison
Plays offline after loading and saves locally without cloud requirement
Original artwork and event writing inspired by fan-loved worlds
Interconnected choice system where every decision leaves a lasting trace
Every scientific claim cites real sources with year, researcher and publication
Hard sci-fi design where physics and signal times follow real scientific laws
Completely free with no ads, payment optional and never pay-to-win
Invented game lore clearly separated and labeled apart from real science basis
Curated collection of 24+ open-source astronomy, physics and biology projects
Project Moon Life
Cosmos Era