@ADPupper@rubber.social It probably wasn't specifically designed that way, but rather a quirk of how the NES PPU directly generates the composite signal. It doesn't always cause the problem, TVs at the time seemed to mostly tolerate it, and it isn't guaranteed to break on modern stuff, either, but the signal is often just interpreted as black. It's "just black" in emulators as far as I know. Which makes sense because most games use "normal" black and treating it as anything else would make most games look strange. I'm not 100% sure about this since I'm just going off NESdev, but I think The Immortal is the only known game to attempt to use the 0d palette entry as a reference black.