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.
Also check out...
And the Official community site archive, an archive of old levels spanning from 2013 to 2018.
Featured levels
Latest news More
- 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
- 12 Jul 2024Principia 2024.07.12
Top rated levels More
Latest custom levels More
Latest adventures More
Latest puzzles More
Glados commented on Residual Number System: 10 hours ago
@dsilverz using numbers that are prime with each other is the way to encode numbers in this system, so it's always like that. There is a video about it called "Strange counters (residue number systems)"dsilverz commented on Residual Number System: 13 hours ago
Errata: "... current max value (7 × 5 × 3 × 2) ..." (my previous comment uses asterisk which was parsed as markdown)dsilverz commented on Residual Number System: 13 hours ago
Nice. Just a tip: the current max value (7*5*3*2) is okay considering the current set of numbers (7, 5, 3 and 2), but other sets (e.g., 8,9,3,4) would require calculating the Least Common Multiplier (LCM) for max.Glados commented on Simple adder: 17 hours ago
@Cyberpunkwitch unfortunately, building takes a huge amount of time and the attention it gets is non existent, that's why I didn't continue itCyberpunkwitch commented on Simple adder: 1 day ago
This is a cute adder, trying to rekindle an interest in tech lately after much burnout and I was excited to stumble on principia. I saw your abandoned computer project on here too, it looks lije an impressive amount of work, hopefully more users stumble onto pricipiavienna890 commented on V/U-8 Engine: 3 days ago
Thanks dude...dsilverz commented on Planetoid and three robots: 5 days ago
For some reason, my levels are being uploaded without thumbnails, even though I placed a Cam Marker for this one...Galaxium commented on Layered Maze: 7 days ago
Ight it's oke :)