Part 4: Mushroom Hill Zone! I find it strange that just like in the first zone of Sonic 3, I was able to collect 4 Emeralds in the first zone of Sonic & Knuckles and I also find it strange that it also took the whole video, very close in length to Part 1, to record just one zone...
Anyway, I would've obtained 5 Super Emeralds in this video if I didn't get nervous and mess up at the end of that stage. I was so close to being finished, too! Hopefully, I'll have at least the 5th one by the end of the 5th or 6th video. I really don't know the relative location of any of the emeralds in the Flying Battery Zone, so I'm not expecting to get any in that part of the game...