Free AI-made browser games you can play online without downloading or signing up
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
516+ games across multiple genres
Play in browser with no downloads or signup
Mobile-friendly games with touch controls
Multiplayer games you can play with friends
Trending games ranked by recent play activity
Hand-picked collections by mood and genre
Games verified to be made with AI
New games added weekly
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
Every game links to its creator's site, preserving creator traffic and ensuring you get the official version
Games verified with public proof they were made with AI, not generated art covers
Directory maintains game links and regularly checks if games are still working
Free to submit your own AI game
Covers games made with various AI tools including Claude, ChatGPT, Codex and Grok
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
Player1AI
Cosmos Era