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

G-flow commented on Large Dummy: 10 hours ago

it looks good

Glados commented on Need lua help for spinning this wheel: 7 days ago

Just apply torque to the entity and done

Galaxium commented on Big Robot Prototype: 17 days ago

More full featured than what I made ;)

Galaxium commented on Large Dummy: 17 days ago

:)

Miner34 commented on Just a normal laser setup: 19 days ago

Ouch this is laggy

voxel commented on Roll!: 22 days ago

Finally got past the last part :3

RI7 commented on Digital Counter Lab- needs your help![help] (here ya go i fixed it): 22 days ago

oh that spinning thing is to test it faster