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Source SDK 2013

Source code for Source SDK 2013.

Contains the game code for Half-Life 2, HL2: DM and TF2.

Now including Team Fortress 2! ✨

Build instructions

Clone the repository using the following command:

git clone https://github.com/ValveSoftware/source-sdk-2013

Windows

Requirements:

  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:
    • Visual Studio 2022 with the following workload and components:
      • Desktop development with C++:
        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:
      • Desktop development with C++:
        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later

Inside the cloned directory, navigate to src, run:

createallprojects.bat

This will generate the Visual Studio project everything.sln which will be used to build your mod.

Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.

You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.

The default launch options should be already filled in for the Release configuration.

Linux

Requirements:

  • Source SDK 2013 Multiplayer installed via Steam
  • podman

Inside the cloned directory, navigate to src, run:

./buildallprojects

This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.

You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:

./mod_tf

Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.

Distributing your Mod

There is guidance on distributing your mod both on and off Steam available at the following link:

https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine

Additional Resources

License

The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.

For more information, see Distributing your Mod.

About

The 2013 edition of the Source SDK

developer.valvesoftware.com/wiki/SDK2013_GettingStarted

Resources

Readme
License

Contributing

Contributing
Activity

Stars

0 stars

Watchers

0 watching

Forks

0 forks
Report repository

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" + '

Skip to content
BranchesTags
Repository files navigation
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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
BranchesTags
Repository files navigation
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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
Repository files navigation
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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
BranchesTags
Repository files navigation
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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
Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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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Source SDK 2013
Source code for Source SDK 2013.
Contains the game code for Half-Life 2, HL2: DM and TF2.
Now including Team Fortress 2! ✨
Build instructions
Clone the repository using the following command:
git clone https://github.com/ValveSoftware/source-sdk-2013
Windows
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • One of the following:

    • Visual Studio 2022 with the following workload and components:

      • Desktop development with C++:

        • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)
        • Windows 11 SDK (10.0.22621.0) or Windows 10 SDK (10.0.19041.1)
    • Visual Studio 2026 with the following workload and components:

      • Desktop development with C++:

        • MSVC Build Tools for x64/x86 (Latest)
        • Windows 11 SDK (10.0.22621.0)
  • Python 3.13 or later
Inside the cloned directory, navigate to src, run:
createallprojects.bat
This will generate the Visual Studio project everything.sln which will be used to build your mod.
Then, on the menu bar, go to Build > Build Solution, and wait for everything to build.
You can then select the Client (Mod Name) project you wish to run, right click and select Set as Startup Project and hit the big green > Local Windows Debugger button on the tool bar in order to launch your mod.
The default launch options should be already filled in for the Release configuration.
Linux
Requirements:
  • Source SDK 2013 Multiplayer installed via Steam
  • podman
Inside the cloned directory, navigate to src, run:
./buildallprojects
This will build all the projects related to the SDK and your mods automatically against the Steam Runtime.
You can then, in the root of the cloned directory, you can navigate to game and run your mod by launching the build launcher for your mod project, eg:
./mod_tf
Mods that are distributed on Steam MUST be built against the Steam Runtime, which the above steps will automatically do for you.
Distributing your Mod
There is guidance on distributing your mod both on and off Steam available at the following link:
https://partner.steamgames.com/doc/sdk/uploading/distributing_source_engine
Additional Resources
License
The SDK is licensed to users on a non-commercial basis under the SOURCE 1 SDK LICENSE, which is contained in the LICENSE file in the root of the repository.
For more information, see Distributing your Mod.
About
The 2013 edition of the Source SDK
developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Resources
Readme
License
Contributing
Contributing
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