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 and Android, download it today.
This site, principia-web, 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
- Sep 10, 2023 – Follow Principia on Mastodon!
- Jul 10, 2023 – The new Principia Official Community Site Archive
- Mar 10, 2023 – Principia 1.5.2 Beta build 2023-03-10
- Dec 31, 2022 – Principia 1.5.2 Beta builds are here!
- Dec 26, 2022 – principia-web turns 2!
MEMORY_LOST commented on clutch: 1 day ago
forgor to mention:z for rpm
x for the clutch engagement
c for reverse
MEMORY_LOST commented on Wireless Data Transfer: 4 days ago
bro actually used magnet sockets for what it's used for xdMEMORY_LOST commented on 4 piston rotary engine: 7 days ago
actually its radial not rotary lol.ROllerozxa commented on Ford f150: 12 days ago
Please stop ripping off others levels.KINNO commented on SKAY[1.0] : 15 days ago
Ke ke keGamer127 commented on 32-bit Controllable Binary Counter: 19 days ago
IncredibleMEMORY_LOST commented on Monster truck: 24 days ago
i suggest using the "chest opening" sfx rather than a wood for the engine sound i suppose?, it's just a suggestion.Gamer127 commented on Roll!: 1 month ago
Thanks for the fun game.