Version 4.21 was rated as an enhanced mobile platform optimization. As a result, new features have been added to improve multiplayer support, and the convenience of developing virtual reality (VR), expanded reality (AR) and mixed reality (MR) has improved. The game is added to general industry users. The easy development of many player support has also been improved. The Recently Added Replication Graphics Plug-in feature reduces CPU costs for computing network data for large-scale multiplayer gaming. Added ability to detect and reduce DDoS (Distributed Denial of Service) attacks using Spoof UDP packets.
"We would like to thank the developers of the Unreal Engine community who submitted their comments on this update, including 121 improvements," said Park Sung-chul, President of Epic Games Korea.