Welcome to Principia

Principia is a physics-based sandbox game. Build and play advanced contraptions, circuiting, minigames, puzzles, robot adventures and more. Open source, free and available for Windows, Linux, Android and more, download it today.

This site is the new community site for Principia. When you have installed Principia, enjoy the levels others have created, and register in order to upload your own levels and interact with the community.

Want to read more about Principia?

Also check out...

GitHub Codeberg Discord Fluxer YouTube Mastodon Lemmy

And the Official community site archive, an archive of old levels spanning from 2013 to 2018.

Apparatus player? Check out Principia for Apparatus Players on the Principia Wiki!