Gravity3D

Play the full game in your browser

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You don't control the universe. Only the initial conditions.

One launch can turn into an orbit, a slingshot or a collision. Guide a civilisation from a stone and a moon to stars, black holes and the seed of a new universe.

Play the two-mission demo

Play First Contact and The Moon's Orbit directly in your browser, free. This demo contains only these two missions.

Full Windows edition — $9.99

• All 10 story chapters and 29 selectable scenes: 26 playable objectives and three observation scenes.
• The complete current story, including the black-hole finale and epilogue.
• Every chapter and scenario accessible from the start; completion earned by play.
• A rotatable 3D view, gravity-field visualisation, adjustable speed and verified-launch hints.
• Original music and local browser progress saves. English only.

Purchase the full Windows ZIP below, extract it completely and double-click Play.bat. It opens the game in your browser. No Python installation, account inside the game, Patreon subscription or administrator rights required. Windows 10/11 with PowerShell and a modern WebGL browser required. Use Stop.bat when finished. macOS/Linux are not included in this download.

How to play

Drag to set your launch direction and speed, then release. Right-drag or Shift + left-drag to rotate; use the mouse wheel to zoom. On touchscreens, rotate with two fingers and pinch to zoom. Use Missions/Campaign or Scenario to choose a board.

R: reset. H: hint (twice quickly: demo). F: gravity field. M: music. Use the speed selector to pause or accelerate.

In development

The last three full-game story chapters are marked Experimental. Screenshots show the full edition. Browser site data stores your progress; clearing it may erase saves. The relativistic finale is science-fiction storytelling within a simplified simulation.

Gameplay and guides on YouTube
Support development on Patreon

Earth imagery: NASA Goddard Space Flight Center; Reto Stöckli and Robert Simmon.