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Legacy Unreal Engine Documentation

This site provides the official documentation for the award-winning UE3 Unreal Development Kit (UDK), and its predecessor the Unreal Engine 2.

UE3 was the leading engine of the previous generation, but has been improved upon by the Unreal Engine 4 technology. Teams who are already developing with UE3 are welcome to continue development and utilize the information provided here; however for new projects, we recommend UE4.

International developers may experience better speeds by visiting our East Asian mirror sites for China, Japan, and Korea.

Learn all the skills you need to master the previous generation of Unreal Engine technology to create engaging experiences, exciting gameplay and beautiful environments.

Learn the skills needed to use this powerful and flexible game engine and its toolset to create games that run on previous generation hardware configurations and platforms.

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Information to get started licensing Unreal Engine technology and other legal and business information.

By contributing information to Epic's Unreal Engine support outlets, including but not limited to Unreal Developer Network websites and mailing lists, you agree that any information you, your employees, assignees, sub-licensees, or representatives post shall become the sole property of Epic.