I’d completely forgotten all about Hill Top Zone and Oil Ocean. I don’t know how, but I had. And isn’t Sonic 2 so much bigger than the original? I remember being slightly disappointed when I first got it, since most zones only had two levels, rather than the three the first game did, but there are so many more zones it doesn’t really matter.
I was really pleased with myself for making it as far as Death Egg without dying, but then Metal Sonic pranged me several times, and since I’d forgotten exactly how to damage Eggman, he killed be a few times too. Bah.
But then I killed him and the world was saved!