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Principia

Principia is a free, open-source game for Android. Physics-based sandbox building game. It has 428 GitHub stars and is released under the BSD-3-Clause license, and you can install it from F-Droid.

github.com/Bithack/principia (opens in a new tab)

Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error

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About Principia

Principia is a physics-based sandbox building game. Build and play advanced contraptions, circuiting, minigames, robot adventures and more. The sandbox contains 200+ different objects ranging from basic wooden building blocks to circuitry, electrical and mechanical components, small robots you can control and fight against, and a LuaScript object featuring Lua scripting that can interact with the world. Build a controllable car, a calculator or make your own game with circuitry or in Lua. The Principia community site contains tens of thousands of creative levels made by players like you, from impressive contraptions to amusing games all for you to browse through and play.

Privacy and F-Droid

F-Droid builds Principia from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.

No anti-features flagged on the latest F-Droid build.

Screenshots

  • Principia screenshot 1
  • Principia screenshot 2
  • Principia screenshot 3

Screenshots from the app's F-Droid listing.

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FAQ

Principia FAQ

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Is Principia free and open source?

Yes. Principia's source code is public on GitHub under the BSD-3-Clause license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.

How do I install Principia?

You can install Principia from F-Droid (package com.bithack.principia); the links are on this page. Its GitHub repository also publishes releases (latest: 2026.10.22).

Is Principia still maintained?

The repository's most recent commit was on Oct 22, 2026. Its F-Droid listing was last updated on Oct 8, 2026. appsgit only lists apps whose repository had a commit in the last six months.