Deepfield is a 4X space strategy game played in the browser. Every star system in it is a real one: all 6,338 confirmed exoplanets in NASA's Exoplanet Archive, in the 4,747 systems around them, placed where astronomers have measured them. Explore, colonise, trade and fight four AI empires, in one continuous 3D view that zooms from the whole map down to a planet's surface.
deepfield.mcp-g.com · Free, in your browser · Nothing to install
The game
A grand strategy game in the style of the classic 4X: explore, expand, exploit, exterminate. Except the map is real.
Every system is a real star with confirmed exoplanets, at its measured position and distance. 119,626 background stars from the HYG catalogue fill the sky.
One continuous 3D scene, zoomed with the mouse wheel from the whole map down to a procedurally rendered planet surface. No loading screens between views.
Four AI empires expand, ally, fall out and fight. The balance is tuned so nobody wins outright, and the galaxy keeps going while you're away.
Colonies, 46 technologies, starbases, edicts, admirals, a market, anomalies to investigate, and a ship designer.
Every design gets its own symmetrical silhouette built from rectangles, circles and triangles, seeded so it looks the same everywhere.
A generative soundtrack and sound effects made in the browser with Web Audio, so it changes with what's happening on the map.
How it was made
The map isn't invented. It's built from published astronomical catalogues, and the game is honest about which numbers are measured and which are made up.
All 6,338 confirmed exoplanets in 4,747 systems, from the Planetary Systems Composite Parameters table (DOI 10.26133/NEA13), pulled 19/09/2026. Masses, radii, orbits, temperatures and star types come straight from it.
119,626 background stars from the HYG v4.1 database (CC BY-SA 4.0), so the sky you see behind the map is the real one.
Dust clouds from Zucker et al. (2020) and open star clusters from Hunt & Reffert (2023), both built on ESA's Gaia survey.
Every number in the game is tagged: NASA (measured), CALC (worked out from measured values, such as habitability from temperature, radius and density) or GAME (made up for play). Invented data never pretends to be an observation.
5,778 hyperlanes join every system into one connected map, generated from the real 3D positions rather than drawn by hand.
Designed by Green & Home and built with Anthropic's Claude Code: TypeScript, Three.js and Vite in the browser, Cloudflare Workers, Durable Objects and D1 behind it.
FAQ
If you don't see your question, email hello@mcp-g.com.
Yes. It's free to play in your browser, with nothing to install. In-game credits can't be bought or sold for real money.
Yes. Every star system on the map is a real system with at least one confirmed exoplanet, taken from the NASA Exoplanet Archive, at its measured position. Where the game needs a value NASA hasn't measured, it says so: each figure is labelled NASA, CALC or GAME.
No. One game day passes for every real minute, and the AI empires carry on. When you come back you get a report of what happened while you were away.
A modern desktop browser with WebGL, such as Chrome, Edge, Firefox or Safari. A mouse with a scroll wheel makes zooming easiest.
Green & Home designed it and built it with Claude Code, Anthropic's AI coding agent, on TypeScript, Three.js and Cloudflare Workers. The star data comes from NASA, the HYG catalogue and ESA's Gaia survey.