Hello! My monitor (no 4K) is connected to the PC via HDMI cable, and Windows 10 sound is ok. When playing 0 A.D. 0.0.24b-alpha in fullscreen mode, there is no sound. When playing in windowed mode, there is sound. I found a possible explanation for this, but I am unsure whether this is the root cause here as well. See what Intel says about it: When I alternatively connect the monitor via Thunderbolt 3/USB-C - HDMI - Adapter to the PC, there is 0 A.D. game play sound also in fullscreen