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This template will automatically add superscript, as well as using the formatting that creates the correctly numbered link. Please note that the 1 has nothing to do with what number the link gets, that is determined by how many footnotes are on the page.

URL with no = in it: Usage: {{fn|http://www.blah.blah}}

Puzzle Pirates main Page [1]

If your URL has = in it, add 1= before the URL: Usage: {{fn|1=http://www.blah.blah}}

Game Design Forum [2]