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...

GitHub Discord Matrix

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

Featured levels

Latest news More

Top rated levels More

Latest custom levels More

Latest adventures More

Want more? Check out the Official community site archive, a complete archive of levels spanning 2013 to 2018

Latest comments

freelikegnu commented on Tiny Rocket Drone - Lua PID: 2 days ago

Very good control!

Aeonixx commented on Falling Notes - Gymnopedie No. 1: 9 days ago

My score is 3810

ROllerozxa commented on comically fast wizard (fixed): 10 days ago

laggay 🏳️‍🌈

MEMORY_LOST commented on comically fast wizard (fixed): 10 days ago

what the hell have you done 😭
it's so laggay it just crashed buh.

freelikegnu commented on Principianball [FreeLikeGNU] WIP: 21 days ago

G-flow, I'll work on score upload once the table is finished... there's a bit more I want to do first.

G-flow commented on Principianball [FreeLikeGNU] WIP: 22 days ago

is good, but u can upload the scores?

voxel commented on TOILET FLUSH: 24 days ago

i clogged the toilet

freelikegnu commented on music: 1 month ago

rad!