A blue link is simply a link to an existing trope or work. "Blue Linked" simply means that one valid trope or work is linked to another. Stringing these together can make you see blue
. In this wiki, links to pages that don't exist but share their title with existing pages also display as blue.
Not to be confused with the blue Link from The Legend of Zelda: Four Swords
, The Legend of Zelda: Four Swords Adventures
, and Super Smash Bros.
. Contrast with a Red Link