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

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

voxel commented on Roll!: 12 hours ago

Finally got past the last part :3

RI7 commented on Digital Counter Lab- needs your help![help] (here ya go i fixed it): 18 hours ago

oh that spinning thing is to test it faster

RandomMechEngineer commented on Large Dummy: 1 day ago

@ROllerozxa Thanks!!

ROllerozxa commented on Large Dummy: 1 day ago

Those look quite accurate and well-done. :) Good job!

Galaxium commented on Unused Objects: 5 days ago

Wait how do you hack a level???

Galaxium commented on THE Smallest Car :): 8 days ago

Hehehe

Galaxium commented on Simple consolе simulator: 9 days ago

cool.