The preview period recently closed in preparation for the public launch.
The official public release on Steam is scheduled for April 28, 2026 . Key Features: S&Box.Build.10376186.zip
Facepunch recently transitioned the platform to an open-source (MIT license) model, allowing users to modify the engine code via GitHub . The preview period recently closed in preparation for
Unlike Garry's Mod (Lua), s&box uses C# for all high-level systems, including the editor, networking, and UI. including the editor
The file appears to be a specific development or community-distributed build of s&box (pronounced "sandbox"), the spiritual successor to Garry's Mod developed by Facepunch Studios . Project Overview