The new game engine is even more different from Great Battles than Great Battles was from Rise of Flight. DirectX 12, Physically Based Rendering (PBR) technologies, new visualization systems for atmosphere, vegetation, graphical effects, integration of a new version of the sound API, a new GUI engine and design, an evolution of the aircraft simulation physics engine, including a new aerodynamics, systems operation and damage model, a new damage model for ground objects and ships, a new system of decision making and giving orders to AI pilots, a new radio communication system, and, of course, a new qualitative evolution of the main game mode — all this together makes a qualitative leap, not just an evolutionary step. It required a huge investment of effort and resources from us, because for the new technologies all models, effects, sounds, graphical interface — all this had to be created from scratch. In other words — this is not just "a new version of IL-2," no. "Korea. IL-2 Series" is a completely new version of the engine and has completely new content.