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HIDDEN CUPS
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Enter the following codes at the "Ring Tournament".

Mario Cup                  A3W5KQA3C
Luigi Cup                  M1C2YQM1W
Wario Cup                  UOUFMPUOM
Waluigi Cup                LA98JRLAR
Bowser Cup                 N24K8QN2P
Donkey Kong Cup            MM55MQMMJ
Peach Cup                  OF9XFQOFR
IGN64 Cup                  V2UFMPUZM
MarioTennis.com Cup        48HWOR482
Nintendo Power Cup         J6M9PQJ6U
Blockbuster Cup            ARM6JQARU


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HIDDEN COURTS
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Mario and Luigi Court
  Win the Star Cup with Mario in doubles.
  Ball Speed: Fast
  Bounce: Normal

Baby Mario and Yoshi Court
  Beating the Mushroom Cup/Singles Tournament using Yoshi.

Birdo and Yoshi Court
  Select Birdo, enter the Tournament Mode and select Doubles (your
  partner will be Yoshi). Then play till you beat the Star Cup.

Donkey Kong Court
  Beating the Mushroom Cup/Singles Tournament with Donkey Kong.

Super Mario Bros. Court
  Beating the Mushroom Cup/Singles Tournament using Mario.

Wario and Waluigi Court
  Use Wario and beat the Doubles Star Cup.

Piranha Court
  After beating the Piranha Challenge you can play on the Piranha
  Court, but only in the Piranha Challenge.


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HIDDEN PLAYERS
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Donkey Kong Jr.
  You simply have to complete the Star Cup/Doubles Tournament.

Shy Guy
  Beat the Star Cup/Singles Tournament.

Star Players
  You can earn a star player simply by beating the Star Cup. Hold R
  as you select your character. This will make your character a Star
  Player.