The versions of Unreal Engine that have existed throughout history are the following:
- Unreal Engine 1: created in 1998, it integrated rendering, collision detection, AI, networking options, and file system manipulation into a fairly comprehensive engine.
- Unreal Engine 2: created in 2002, its rendering engine was completely rewritten, in addition to integrating the new Unreal Ed 3.
- Unreal Engine 3: created in 2006, designed for PC with DirectX 9/10 support, Xbox 360 and PlayStation 3: Its rewritten engine supported advanced techniques such as HDRR, normal mapping and dynamic shadows.
- Unreal Engine 4: created in 2008, this version of Unreal Engine has been available for free since 2015.
- Unreal Engine 5: created in 2020, this edition is compatible with all existing systems as well as the next generation of PlayStation 5 and Xbox Series X / S consoles. It is expected that in early 2022 it will be liberalized and free.