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

Glados commented on 64 - bit Adder/Subtractor: 9 days ago

@Galaxium don't bet on it, I've got a lot of parts created, including Lua RAM. It takes an insane amount of time to make and it doesn't worth it

Galaxium commented on 64 - bit Adder/Subtractor: 9 days ago

*Bet,

Galaxium commented on 64 - bit Adder/Subtractor: 9 days ago

Bet that be a hell of an achievement
I'm down ^^

Glados commented on 64 - bit Adder/Subtractor: 9 days ago

@Galaxium if we challenge eachother we will end up doing a complete computer. I'll leave that to you

Galaxium commented on 64 - bit Adder/Subtractor: 10 days ago

Seems I have been challenged 😏
Accepted 😉

Glados commented on 64 - bit Adder/Subtractor: 11 days ago

@Galaxium come on, you can do better

Galaxium commented on Geneva Mechanism rev2: 17 days ago

Thanks broski :)

RandomMechEngineer commented on Geneva Mechanism rev2: 17 days ago

Hi, just max out the damper stats and to further decrease vibration, add a second rubber beam in the same position to reduce overlapping caused by contact physics calculation. You can reduce the damper force a bit afterwards if there's too much resistance