Original Metroid.

[Syrus195112]

I need someone to point in the right direction,and I'm not sure there are any guides.After I get that thing so I can turn into a ball,and go to the towering thing with a whole bunch of rooms,which door do I go through,or do I go troiugh them all one at a time?

[lPhela]

I completed this game and I hope you are up for a challenge.

Nintendo designed the rooms in such fashion, that for you to advance there is always a room somewhere where you find an item to help you progress throught the game.
This is the famous Metroid gameplay.

I don't know if you played a Metroid game or Metroid Zero Mission(a remake of the 1st Metroid)specifically before, but if you have then it would certainly help.

You need to learn and master an advanced morph ball technique called the bomb jump to move on a bit later in the game.