Tennis 2K2 - Platform: Dreamcast

Alternate costume color 
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At the player selection screen, select a player 
and press L or R. 

Play as King or Queen 
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Win all matches without using any continues. 
If using a male character, you will face King. 
If using a female character, you will face Queen. 
Defeat them to unlock them as playable characters. 
When you unlock them they will be at Level 1. 
Each time you defeat them after unlocking them 
their level will go up.