Unlock King or Queen
     To  unlock  the  King or Queen, win all of your matches in Arcade
mode  without  using  continues.  If you're male, you'll face King. If
you're  female,  you'll face Queen. Beat the opponent to unlock him or
her.

Unlock King's Court
     Beat  the  King  and  Queen  in Mixed Doubles, in World Tour Mode
(level 5).