This comes straight from Principia’s own GitHub page, and it’s free. Need help installing?
What it looks like
About this app
Principia is a sandbox where you build contraptions and let physics decide what happens. Bolt together beams, wheels, motors and gears, wire up electronics, add robots, and find out whether your machine actually works.
It is the successor to the old Android game Apparatus. You can work through puzzle levels or just tinker freely, script more complicated behaviour with Lua, and upload your creations for other players to try, or play through theirs.
Principia went open source in 2022 and is now looked after by its community rather than the studio that made it. Sharing levels online needs an account on the community site.
From the app’s home page
- See the codeHow it’s made, every line is public
- WebsiteThe app’s own home page
- Questions & commentsTalk with the people who make it
- Report a problemTell the makers something is broken
- All versionsOlder downloads and what changed
- LicenseThe rules for using and sharing it
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