"What is this thing?"
This disambiguation page lists articles associated with the same title. If a link led you here, you may wish to change that link to point directly to the intended article.
Green Door, or Green Hatch, may refer to the following:
Green Hatch, which can be opened with Super Missiles
Green Hatch, which can be opened with BSL Security Level 2
Any opened door on the map in Metroid Prime
Green Blast Shield, which can be opened with the Battlehammer
Green Door, which can be opened with the Nova Beam
Gryncore, which is marked as a green door on the Metroid: Samus Returns map