IIRC the NES PPU only supports one background layer. You can just change the scroll position mid-frame to give it the illusion of multiple background layers. S

IIRC the NES PPU only supports one background layer. You can just change the scroll position mid-frame to give it the illusion of multiple background layers. See here for some clever examples of this technique. Everything that's overlapping is done with sprites: https://youtu.be/ZGyFQ9aRp_U?t=579 https://youtu.be/ZGyFQ9aRp_U?t=579