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

G-flow commented on Tensegrity in 2D: 1 day ago


G-flow commented on Bat Cycle "The Batman": 1 day ago

the other one is faster than batman xd

G-flow commented on Batman, The Dark Night Bat pod: 1 day ago

it is pretty good

Hellohi commented on Wireless Data Transfer: 5 days ago

It's greatttttttt


voxel commented on Centipede with robot arm: 9 days ago

There's literally an object called "sincos"

G-flow commented on Interesting car game with leaderboard: 9 days ago


G-flow commented on ROller's Pinball: 10 days ago

bro, ive got 12k and the ball got stuck nooooo

G-flow commented on airplane boxer engine 2: 10 days ago

this is incredible