Corridors of Darkness are pathways of darkness that link the worlds of the Kingdom Hearts universe together. The Heartless use these extensively to reach other worlds, as do many other characters. Organization XIII and its subordinate Nobodies utilize these pathways, because they can use the darkness without fear of its corrupting effects on the heart. Other characters who have used these corridors include Sora, Donald, Goofy, Riku, Kairi, Naminé, DiZ, Pluto and King Mickey. Of these, only Riku, Naminé and DiZ have been responsible for summoning the portals, and it has been suggested that one must have a strong heart to resist the overwhelming darkness which threatens the user of dark powers.