With the Morph Ball and some Missiles, your next major goal in Brinstar is to find the entrance to Norfair. This entrance is typically guarded by a red door, requiring 5 missiles to open. Explore the lower-right sections of Brinstar. You'll need to navigate through several rooms, often involving dropping down shafts and using the Morph Ball to access hidden paths. The entrance to Norfair is characterized by a long, downward shaft that leads into a fiery, lava-filled environment. Be prepared for increased difficulty once you enter this new region.
