Welcome to Principia
Principia is a physics-based sandbox game. Build and play advanced contraptions, circuiting, minigames, 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.
Also check out...
And the Official community site archive, an archive of old levels spanning from 2013 to 2018.
Featured levels
Latest news More
- Aug 1, 2024 – New contest: Destruction Frenzy
- Jul 12, 2024 – Principia 2024.07.12
- Jun 28, 2024 – Principia 2024.06.28
- May 18, 2024 – Principia is now on F-Droid!
- Feb 29, 2024 – Principia 2024.02.29
MDJappas commented on Plank: 3 days ago
Wowjacobsladder55 commented on He never got over it..: 4 days ago
This is just as infuriating as the real deal. Damn.jacobsladder55 commented on Air Plane: 5 days ago
Funsd95 commented on Air Plane: 7 days ago
Plane crashed like 9/11sd95 commented on MAZ 537G: 7 days ago
Throttle not working. It falls down by itself.Galaxium commented on Rocket Thingy (Warning: Very Technical): 8 days ago
All the easy and mediocre ideas are already taken, leaving only the harder and more obscure ideas :( so ig it makes senseMEMORY_LOST commented on Tank Suspension Track (Prototype): 8 days ago
that main gear to drive the tracks is brilliant!, it graps the chains very well, delivering a smooth force/ride not slippy or skipping like other designs.i honestly don't know why i haven't thought about that design.
Ropster commented on Interesting car game with leaderboard: 12 days ago
Interesting