Papirus

Ya, I played through it years ago. Having trouble finding a metroid or just just don't know where to go to advance after having cleared out an area?

True TCP trivia fact: Metroid 2 was the first game I ever beat, at 8 years old. Unfortunately, I'm 26 now and my memory isn't that good, so I probably can't help.

It may prove to be more of a spoiler than you want, but there are some very thorough maps for that game that you could find with a quick image search.