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Some names can't be used in the "Rename player" function; the game simply responds with "Not cool enough" if you try to enter one. Most are swears, slang terms (some rather dirty), or occult-related items Nintendo would rather not be associated with; some of these words are only considered "dirty" in Europe.
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Entering Sonic or Sega as your name will make the game respond with "Not Cool Enough".
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