A hard sci-fi idle game evolving from the Big Bang to an interstellar civilization
Free online games, no downloads, no sign-up
Stage
Not given
Startup
Founded
Not given
2026
Based in
Not given
IN
Pricing model
Freemium
Free
Pricing
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)
Not given
Key features
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
Ten game categories including action, puzzle, racing and two-player games
Games run directly in browser with no downloads required
No sign-up or registration needed
Play on desktop, tablet and mobile with same functionality
Original in-house games built with AI coding tools
Open-source games under original licences
What makes it different
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
No sign-up walls or lengthy loading times like competitor sites
Hand-picked game library with quality over quantity
Cosmos Era
360 PlayZone