White Door

White Doors are doors that can be only be opened by a weapon using Sub-Zero temperatures, The Ice Beam. It is likley that they could also be opened by the Ice Missile. They are only found in Metroid Prime, although a White Blast Shield appears in Metroid Prime 3: Corruption. The white color is actually the color of a force field covering the door. After shooting a white colored door, the energy covering it will disrupt and dissipate, allowing Samus to enter the next room.

White doors are scarce, although they are used in almost all areas to guard secret rooms. They are most abundant in the Phazon Mines and the deeper parts of the Chozo Ruins.