--- title: S&box Game Engine Released as Open Source by Facepunch... description: Facepunch Studios released S&box, their game engine built on Source 2, as open source under the MIT License. The engine includes custom systems for editor,... canonical: https://daily.dev/posts/s-box-game-engine-released-as-open-source-by-facepunch-studios-pm8u8ouiv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: S&box Game Engine Released as Open Source by Facepunch Studios | daily.dev og:description: Facepunch Studios released S&box, their game engine built on Source 2, as open source under the MIT License. The engine includes custom systems for editor,... og:url: https://daily.dev/posts/s-box-game-engine-released-as-open-source-by-facepunch-studios-pm8u8ouiv og:image: https://api.daily.dev/og/posts/pm8u8OuIv.png og:image:alt: S&box Game Engine Released as Open Source by Facepunch Studios og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # S&box Game Engine Released as Open Source by Facepunch Studios **[Collections](https://daily.dev/sources/collections)** · 2 min read · 2 upvotes · 0 comments ## Summary Facepunch Studios released S&box, their game engine built on Source 2, as open source under the MIT License. The engine includes custom systems for editor, networking, scene management, and UI written in C#, available on GitHub without royalty requirements. Recent updates improved terrain rendering, networked gib spawning, and memory allocation by switching from jemalloc to mimalloc. Developers can freely modify, fork, and publish standalone games while Facepunch monetizes through cosmetic microtransactions and cloud assets. ## Content # S&box Game Engine Released as Open Source by Facepunch Studios Facepunch Studios, renowned for groundbreaking titles such as Rust and Garry's Mod, has announced the open-source release of their game engine, S&box, under the MIT License. Built atop Valve's proprietary Source 2 engine, S&box doubles as both a game development platform and a comprehensive game engine, offering robust support for C#, component-based architecture, and multiplayer capabilities. ## Open-Source Availability The open-source release of S&box includes a variety of custom systems like the editor, networking, scene management, and user interface. These components, predominantly written in C#, are now accessible on GitHub, welcoming developers to view, modify, and fork the code for pull requests, or to create and publish standalone games. Importantly, this initiative requires no royalties, allowing developers to freely innovate and contribute. ## Contributions to the Game Development Ecosystem By releasing S&box as open source, Facepunch Studios underscores its dedication to bolstering the broader game development community. Developers are encouraged to experiment and extend the engine to suit their needs, providing a fertile ground for both enthusiasts and professionals to push the boundaries of game design. ## Recent Updates S&box has recently undergone significant updates. These include improvements in terrain rendering through anti-tiling techniques and seam fixes, enhanced networked gib spawning for breakable props, and a complete rewrite of native memory allocation, transitioning from jemalloc to mimalloc. Additionally, several bugs have been addressed, improving play mode experiences such as VR rendering, environment maps, and text entry functionality. ## Future Prospects Open-sourcing S&box opens up exciting prospects for collaboration and innovation. While Facepunch Studios retains monetization through cosmetic microtransactions and cloud assets, the freedom afforded to developers could lead to new, inventive game experiences. With the proprietary Source 2 engine laying the groundwork, S&box represents a promising venture with a commitment to community-focused growth and development. --- Tags: [#open-source](https://daily.dev/tags/open-source), [#game-development](https://daily.dev/tags/game-development), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/s-box-game-engine-released-as-open-source-by-facepunch-studios-pm8u8ouiv) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"S&box Game Engine Released as Open Source by Facepunch Studios","url":"https://daily.dev/posts/s-box-game-engine-released-as-open-source-by-facepunch-studios-pm8u8ouiv","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/s-box-game-engine-released-as-open-source-by-facepunch-studios-pm8u8ouiv"},"datePublished":"2025-11-28T08:08:41.119Z","dateModified":"2025-11-28T08:09:00.216Z","description":"Facepunch Studios released S&box, their game engine built on Source 2, as open source under the MIT License. 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