SmartlyDressedGames/U3-SDKPublic

What is U3-SDK?

The official source code and Unity-based SDK for the Unturned zombie survival sandbox game.

What does U3-SDK do?

The U3 SDK provides the complete C# source code and development environment for Unturned, a popular free-to-play open-world zombie survival game. It allows developers and modders to deeply explore the game's architecture, make extensive code changes, and create custom content natively within the Unity editor. The SDK requires the Unity 2022.3.62f3 editor and a legal, installed copy of the game via Steam, as it dynamically loads the game's large binary assets and mods directly from that installation. This environment serves as the primary resource for creating advanced, code-driven modifications and understanding the complex internal mechanics of a successful multiplayer sandbox game.

Who is U3-SDK for?

This SDK is designed for game developers and Unturned modders who want to create advanced custom content, write C# modifications, or study the architecture of a successful Unity-based sandbox game.

How do I get started with U3-SDK?

Open the `Assets/GameStartup.unity` scene in the Unity editor after ensuring Unturned is installed via Steam.

How popular is U3-SDK on GitHub?

SmartlyDressedGames/U3-SDK has 3,898 stars and 560 forks on GitHub, and gained 23 stars in the last 7 days.

What license does U3-SDK use?

SmartlyDressedGames/U3-SDK is released under the Other license.

• Battle-tested

  8 years of history

The U3 SDK provides the complete C# source code and development environment for Unturned, a popular free-to-play open-world zombie survival game. It allows developers and modders to deeply explore the game's architecture, make extensive code changes, and create custom content natively within the Unity editor. The SDK requires the Unity 2022.3.62f3 editor and a legal, installed copy of the game via Steam, as it dynamically loads the game's large binary assets and mods directly from that installation. This environment serves as the primary resource for creating advanced, code-driven modifications and understanding the complex internal mechanics of a successful multiplayer sandbox game.

This SDK is designed for game developers and Unturned modders who want to create advanced custom content, write C# modifications, or study the architecture of a successful Unity-based sandbox game.

• Full source access: Provides the complete C# source code for the Unturned game logic, enabling deep architectural understanding.
• Native Unity integration: Designed to be opened, edited, and run directly within the standard Unity 2022 editor environment.
• Dynamic Steam dependency: Efficiently loads large binary assets and mods from the local Steam installation to minimize repository size.
• Visual Studio support: Supports full C# code editing and debugging via standard .NET desktop development tools and IDEs.
• Advanced modding foundation: Serves as the base framework for creating complex, code-driven game modifications beyond simple asset replacements.

Getting started: Open the `Assets/GameStartup.unity` scene in the Unity editor after ensuring Unturned is installed via Steam.

1. 3.26.3.12 Patchv3.26.3.12Sep 21, 2026
2. 3.26.3.10 Patchv3.26.3.10Aug 31, 2026

   Released 2026-08-31

3. 3.26.3.9 Patchv3.26.3.9Aug 28, 2026

   Released 2026-08-28.

4. 3.26.3.8 Patchv3.26.3.8Aug 10, 2026
5. 3.26.3.7 Patchv3.26.3.7Aug 3, 2026

   https://blog.smartlydressedgames.com/posts/2026-08-03-3.26.3.7-patch-notes/

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