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...
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!
Featured levels
Latest news More
- 6 Jul 2025Follow Principia on YouTube
- 14 Apr 2025New contest: Puzzling Puzzles
- 5 Apr 2025Principia 2025.04.05
- 22 Mar 2025Please help to test Principia
- 1 Aug 2024New contest: Destruction Frenzy
Galaxium commented on Just messing around: 6 hours ago
LolROllerozxa commented on Simple pinball beta: 6 days ago
I do quite like a nice new pinball level.owhame commented on dominos (Updated): 6 days ago
👍👍👍Galaxium commented on Tensy: 7 days ago
YAYowhame commented on CUSTOM BIKE: 9 days ago
Cool👍kacperTMPL commented on CUSTOM BIKE: 9 days ago
NoiceBobMonkeypimp2 commented on Just a Steam Train.: 10 days ago
Ha ha! Yes.Galaxium commented on Just a Steam Train.: 12 days ago
makes ASDF reference