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Principia Open Source Project

Principia

Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.

Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.

Useful Links

Binary builds

Release builds builds of Principia for Windows, Android and Linux are available on the download page.

There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.

Getting involved

Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.

For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.

Also be sure to follow @principia on Mastodon for more updates about the project.

Building from source

See Compiling Principia on the wiki for building from source on supported platforms.

(You can also view the plaintext Markdown document here)

License

See LICENSE.md

About

Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.

principia-web.se

Topics

androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows

Resources

Readme
License

Contributing

Contributing

Security policy

Security policy
Activity
Custom properties

Stars

409 stars

Watchers

20 watching

Forks

43 forks
Report repository

Releases

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
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Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Principia Open Source Project
Principia
Principia is a sandbox physics game originally released in November 2013. It is the successor to the 2011 Android hit game "Apparatus". In August of 2022 Principia was released as open source, and is now being developed as an open source project by the Principia community.
Principia runs on anything with a recent enough version of Windows, Linux or Android. Experimental ports to Haiku OS and macOS are also available, and work to port Principia to other platforms are very welcome.
Useful Links
Binary builds
Release builds builds of Principia for Windows, Android and Linux are available on the download page.
There are also nightly build artifacts that get automatically built by GitHub Actions CI on each commit and are available for download, see Nightly Builds on the wiki.
Getting involved
Feel free to fork this project and send in your pull requests. This is a community project and the community decides how the project evolves.
For a brief overview on how to get started with contributing to the game, see the Contributing to the Game page on the wiki.
Also be sure to follow @principia on Mastodon for more updates about the project.
Building from source
See Compiling Principia on the wiki for building from source on supported platforms.
(You can also view the plaintext Markdown document here)
License
See LICENSE.md
About
Open source physics-based sandbox game with electronic circuitry, mechanics, robots, puzzles, Lua scripting and more.
principia-web.se
Topics
androidcppgamehacktoberfestlinuxluaphysics-simulationsandbox-gamesdl3simulationwindows
Resources
Readme
License
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
409 stars
Watchers
20 watching
Forks
43 forks
Report repository
Releases
Used by
Contributors
Languages