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, 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

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

Galaxium commented on Space pinball #2 FR / EN / RU: 2 days ago

D:< it keeps getting stuck in launch or in either of the flippers

ROllerozxa commented on All Sound of SFX Emitter for Android ( 53 sound): 3 days ago

The SFX emitter has been fixed on Android now, what purpose does this level serve?

Moanteq commented on Rope movement: 4 days ago

I thought the title read "rape movement" and I was like wtf lmao

Galaxium commented on Tricky ball!: 5 days ago

fanfare plays

Galaxium commented on Functional Crane: 6 days ago


Galaxium commented on music #3: 6 days ago


Galaxium commented on Unusual Circular Vehicle: 8 days ago

Lemme just steal this real quick :D

Galaxium commented on Dumbest tank ever V2: 8 days ago

Iimmm dddeeeeaaaaddddddd 💀💀💀💀