Blockbuster Cup
Select Special Games, then Ring Tournament. Enter: ARM6JQARU.
(Thanks to kdnana@hotmail.com)

Bowser Court
Trade Bowser from the N64 to the GBC. Finish Bowser’s mini-game on Mario Tennis (GBC), then transfer the court back to the N64.
(Thanks to kdnana@hotmail.com)

Bowser Cup
Select Special Games, then Ring Tournament. Enter: N24K8QN2P.
(Thanks to kdnana@hotmail.com)

DK Cup
Select Special Games, then Ring Tournament. Enter: MM55MQMMJ.
(Thanks to kdnana@hotmail.com)

Donkey Kong Court
Beat the Mushroom Cup in singles with Donkey Kong.
(Thanks to kdnana@hotmail.com)

Game Informer Fruit Cup
Select Special Games, then Ring Tournament. Enter: JEP8YQJER for Baby Mario vs. Bowser; and Enter: E8ULJRE8M for Mario vs. Boo.
(Thanks to kdnana@hotmail.com)

IGN64 Tennis Cup
Select Special Games, then Ring Tournament. Enter: V2UFMPUZM.
(Thanks to kdnana@hotmail.com)

Luigi Cup
Select Special Games, then Ring Tournament. Enter : M1C2YQM1W.
(Thanks to kdnana@hotmail.com)

Mario and Luigi Court
Beat the Mushroom Cup Singles with Mario.
(Thanks to kdnana@hotmail.com)

Mario Brothers Castle Court
Beat the Star Cup in singles and doubles with Mario.
(Thanks to kdnana@hotmail.com)

Mario Brothers Court
Beat all Cups in doubles with Mario.
(Thanks to kdnana@hotmail.com)

Mario Cup
Select Special Games, then Ring Tournament. Enter: A3W5KQA3C.
(Thanks to kdnana@hotmail.com)

Mariotennis.com Cup
Select Special Games, then Ring Tournament. Enter: 48HWOR482.
(Thanks to kdnana@hotmail.com)

Maximum Difficulty
Win every cup with all characters (not the GBC characters) in singles and doubles.
(Thanks to kdnana@hotmail.com)

Nintendo Power Cup
Select Special Games, then Ring Tournament. Enter: J6M9PQJ6U.
(Thanks to kdnana@hotmail.com)

Peach Court
Trade Peach from the N64 to the GBC. Finish Peach’s mini-game on Mario Tennis (GBC), then transfer the court to the N64.
(Thanks to kdnana@hotmail.com)

Peach Cup
Select Special Games, then Ring Tournament. Enter: OF9XFQOFR
(Thanks to kdnana@hotmail.com)

Piranha Plant Court
Complete 100% any court with any character in the Piranha Plant Challenge.
(Thanks to kdnana@hotmail.com)

Play as a Leftie
Hold L while selecting a character.
(Thanks to kdnana@hotmail.com)

Star Tournament
Beat the game with one character, then hold R when choosing your character. Choose Tournament, and you now have 3 new Cups for that character, which are similar to the Mushroom, Flower, and Star Cups, but more difficult.
(Thanks to kdnana@hotmail.com)

Super Mario Court
Trade Super Mario from the N64 to the GBC. Finish Super Mario’s mini-game on Mario Tennis (GBC), then transfer the court to the N64.
(Thanks to kdnana@hotmail.com)

Unlock Donkey Kong Jr.
Beat the Star Cup in Doubles.
(Thanks to kdnana@hotmail.com)

Unlock Shy Guy
Beat Star Cup in singles.
(Thanks to kdnana@hotmail.com)

Waluigi Court
Trade Waluigi from the N64 to the GBC. Finish Waluigi’s mini-game on Mario Tennis (GBC), then transfer the court to the N64.
(Thanks to kdnana@hotmail.com)

Waluigi Cup
Select Special Games, then Ring Tournament. Enter: LA98JRLAR.
(Thanks to kdnana@hotmail.com)

Wario Brothers Court
Beat all Cups in doubles with Wario.
(Thanks to kdnana@hotmail.com)

Wario Court
Trade Wario from the N64 to the GBC. Finish Wario’s mini-game on Mario Tennis (GBC), then transfer the court to the N64.
(Thanks to kdnana@hotmail.com)

Wario Cup
Select Special Games, then Ring Tournament. Enter: UOUFMPUOM.
(Thanks to kdnana@hotmail.com)

Yoshi and Baby Mario Court
Beat the Mushroom Cup in singles with Yoshi.
(Thanks to kdnana@hotmail.com)

Yoshi and Birdo Court
Beat the Star Cup in doubles using Birdo.
(Thanks to kdnana@hotmail.com)

Yoshi Court
Trade Yoshi from the N64 to the GBC. Finish Yoshi’s mini-game on Mario Tennis (GBC), then transfer the court to the N64.
(Thanks to kdnana@hotmail.com)

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