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s&box is a spiritual successor to Garry’s Mod and a love letter to Source 2

What's s&box?

S&box is not going to be Garry's Mod 2. It will eclipse what is possible in Garry's Mod rather than simply be a modern version of it.

We are taking Source 2 and using our knowledge of Source 1, Garry's Mod, Unity and Unreal Engine we're trying to create an intuitive, modern feeling game development enviroment where everything is moddable.

Like Rust and Garry's Mod - we see this as a long term thing. We intend to eventually make our own games using it. It is something for us to work on and improve every day for the next couple of decades.

Key Features

A few of our key features of the s&box engine.


Play hundreds of community created games spanning many genres including shooters, platformers, puzzles, racers, and more!

Party up with your friends in the main menu and start playing any game together.

There is no installing or subscribing to games or addons, just click to play.



Create your own games and play test them instantly with our very familiar scene system.

Games are coded with our first-rate C# API, easy to get started for beginners and powerful for advanced users.



Sharing your games is easy, click to publish and everything is uploaded to our backend automatically, ready to play right away.



Multiplayer is built into the engine.

You can test your games or levels straight away with the community.



See your code changes take effect immediately with our blazing fast hotloading, no need to compile and restart your game.


Cloud Assets

Create your games and levels with a huge collection of assets.

No manual downloading or subscribing required, drag them straight from the asset browser into your scenes or levels.



Create levels with Valve's powerful Hammer Editor.

We have also made Hammer moddable, you can add new functionality, UI, primitives and more.


Terrain System

Create huge open worlds with our terrain system.


Visual Scripting

ActionGraph can be used to create interactive experiences in your levels, without having to write a single line of code, or having sprawling chains of entities.


Shader Graph

Create unique looking materials easily with our Shader Graph.


Virtual Reality

Create and play virtual reality games quickly and easily.