Starting off
Start off like the original Metroid, Go left and grab the Morph Ball. There'll be some changes, but that just adds to the gameplay. Now go right, you'll see a statue with a curve on it's hand, morph into a ball and go on the hand. You'll find yourself in a vertical shaft, go up and go to the first door you can go through. This is the area where you get the long beam. No missiles needed here, now go back and go to the upper area, seeing that you can't enter the lower area. Go right and you'll find a gray door and a sidehopper will come crashing down, crouch down and kill him. go through the gray door. You'll find another chozo statue, enter it with your Morph Ball and continue. Go down to where you couldn't go without the long beam. Cross it and you'll be in East Brinstar.