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Make games without the bullshit.

From the creators of Garry's Mod — a game creation platform built on Source 2 and the latest C#. Create games with an intuitive editor, millisecond hot reloads, built-in multiplayer and share instantly.

Open source. No royalties. No catches.

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Latest News

Update 26.05.27

A smaller, maintenance focused week - audio system rewrite, physics optimizations, and a load of bug fixes.

3 days ago

Update 26.05.20

This update introduces new tutorials, random drops, a platform chat system, a new welcome screen, rendering and audio API additions, performance improvements, and a wide range of editor and rendering fixes.

10 days ago

Hackweek (May 2026)

Weird and interesting things we got up to during hackweek, voxels, gaussian splats and more

13 days ago

Update 26.05.13

AI thumbnail punishment, more discovery updates, FSR3 upscaling, a big physics update and more.

17 days ago

Key Features

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

Play

Play hundreds of community-made games — from shooters 🔫 and platformers 🧗 to puzzlers 🧩 and racers 🏎️.

Team up with friends 👯‍♂️ right from the main menu and jump into any game — together.

No installs. No subs. No addons. Just click ⚡ and play 🎮.

Create

Create

Create your own games 🛠️ and playtest instantly with our familiar scene system 🎬.

Build with our first-rate C# API — easy for beginners, powerful for pros 💪.

/// <summary>
/// Moves the object forward in the camera direction when pressing forward
/// </summary>
public class ShipControls : Component
{
    /// <summary>
    /// The speed to move the object
    /// </summary>
	[Property, Range( 0, 1000 )] 
    public float Speed { get; set; } = 200.0f;

	protected override void OnUpdate()
	{
		if ( Input.Down( "forward" ) )
		{
			var forward = Scene.Camera.WorldRotation.Forward;
			WorldPosition += forward * Speed * Time.Delta;
		}
	}
}
C#

C#

Write in modern C# 14 with the latest language features — no legacy baggage 🧳.

Powered by .NET 10 and a familiar Component System — intuitive, flexible, and fast ⚡.

Enjoy smooth performance with no GC stutters 💨.

Open Source

Open Source

Our code is on GitHub 🤓 and is MIT licensed 😍 - so you can do whatever you want with it.

We believe that the positives of open source massively outweigh any negatives 🧙🏼.

Share

Share

Sharing your game is effortless — just click to publish 📤. Everything uploads automatically and is ready to play instantly 🚀.

Play Fund

Play Fund

Earn real money 💰 when people play your games — our Play Fund rewards creators based on engagement, not ads or microtransactions.

The Play Fund grows with our success - so the more players the game gets, the bigger the pool will be. So far we've paid $575,680.19 !

Multiplayer

Multiplayer

Multiplayer is built right into the engine 🔧 — no setup needed.

Playtest your games or levels instantly with the community 🧪🌍.

Hotload

Hotload

See code changes take effect instantly with blazing-fast hotloading ⚡ — no compiling, no restarts.

Cloud Assets

Cloud Assets

Create your games and levels with a huge library of assets 🧱.

No downloads, no subs — just drag straight from the asset browser into your scene 🎯.

Hammer

Hammer

Create levels with Valve’s powerful Hammer Editor 🔨.

We’ve made it moddable — add new tools, UI, primitives, and more 🔧.

Action Graph

Action Graph

Use our visual scripter, ActionGraph, to build interactive experiences — no code, no messy chains of entities 🧩⚡.

Shader Graph

Shader Graph

Create unique materials and post-processing effects 🎨⚙️ with ease using our Shader Graph.

Virtual Reality

Virtual Reality

We’re committed to making VR on PC easy to develop and seamless to play 🥽🚀.

Publishing

Publishing

Coming soon: export and release your s&box games as standalone titles on Steam 🚀.

Completely free, no royalties, no strings. Your game, your name, your revenue 💼.

Stop reading. Start playing.

Play. Explore. Make Games.

exploreBrowse games Get it on Steam