S&box (pronounced Sandbox) is an upcoming open source video game development platform and engine by Facepunch Studios. It is built using a heavily modified Source 2 engine and will be released on April 28, 2026. S&box is intended to be a spiritual successor to ''Garry's Mod'' and is designed to allow users to create a variety of games and experiences.
S&box (pronounced Sandbox) is an upcoming open source video game development platform and engine by Facepunch Studios. It is built using a heavily modified Source 2 engine and will be released on April 28, 2026. S&box is intended to be a spiritual successor to ''Garry's Mod and is designed to allow users to create a variety of games and experiences.
== History == In September 2015, Garry Newman, the creator of Garry's Mod, first mentioned that a sequel was in development. In September 2017, Facepunch Studios officially unveiled S&box as a prototype. This early version was built using Unreal Engine 4 (UE4), incorporating a hotloading C# layer. The developers used UE4 for core features like rendering, networking, and physics. At this point, it was uncertain whether S&box would be released as a moddable platform or used internally by Facepunch.
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