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SOURCE 2 · C#
Build and play games with s&box.

Facepunch's game engine and creation platform — make games in C#, or jump straight into community games.

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s&box Wiki

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NOT AFFILIATED WITH FACEPUNCH STUDIOS · © 2026 s&box Wiki (community)
Docs/Code
Code

Code

S&box games are written in C#. The engine features a hotload system that compiles and applies your code changes within milliseconds, so you can iterate without restarting.

Code Basics

Cheat sheets, math types, console variables, and API whitelist information to get you productive quickly.

Advanced Topics

Code generation, hotloading internals, and unit testing.

Libraries

How to use and create reusable code libraries for your projects.

Source: Facepunch/sbox-docs (CC-BY-4.0) · updated 2026-04-10. Read it rendered on the official docs.

More in Code

Advanced Topics
Api Whitelist
Cheat Sheet
Code Basics
Code Generation
Console Variables
Hotloading
IsValid
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Community wiki — not affiliated with Facepunch Studios. For the latest and most authoritative information, see the official developer wiki.