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s&box is a modern game engine built on Valve’s Source 2 and the latest .NET technology. Write gameplay code in C#, build scenes visually in the editor, and deploy multiplayer games with built-in networking.

Installation

Get the editor from Steam or build from source

Your first project

Create a scene, add components, and run your first game

Core concepts

Scenes, GameObjects, and the component model

API reference

Full engine API surface

Build docs developers (and LLMs) love

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