Yeah, I didn't use the correct term, really. Most people would associate "multilayered scrolling" with multiple fully independent background layers like the Ge

Yeah, I didn't use the correct term, really. Most people would associate "multilayered scrolling" with multiple fully independent background layers like the Genesis had. What the Master System did have was the necessary bits (interrupts? scan line counters? etc?) to alter the scroll registers during hblank intervals to do scroll various bits of a single background layer at different speeds. Commercial example, "TransBot" a tiny budget card based game - https://youtu.be/k2U-SnDCJ4M?t=878 https://youtu.be/k2U-SnDCJ4M?t=878 Amazing modern homebrew demo example - https://www.youtube.com/watch?v=SMjduDpUeaI https://www.youtube.com/watch?v=SMjduDpUeaI NES games that did this typically needed one of the mapper chips that provided the necessary counters/interrupts/idunnowhat. But the SMS can handle this with ease, no extra hardware required.