Play Luigi’s Shooting Star mini-game and win both levels. When you get to the third level, beat the high score of 60 to unlock the Castle Court in linked play and exhibition modes.
Play Baby Mario’s Target Shot mini-game and win both levels. When you get to the third level, beat the high score of 60 to unlock the Tropics Court in linked play and exhibition modes.
Play Donkey Kong’s Banana Bunch mini-game and win both levels. When you get to the third level, beat the high score of 60 to unlock the Jungle Court in linked play and exhibition modes.
Play Mario’s Boo Blast mini-game, complete levels 1 and 2, and beat the high score to unlock the Star Court.
Play as Students
Defeat the students you face in the Junior, Senior, Varsity, and Traveling Leagues to unlock them at the character selection screen.
Play as Mario
Successfully complete the game in Singles.
Play as Peach
Successfully complete the game in Doubles.
Nintendo 64 characters
Use the Transfer Pak with the Nintendo 64 version of Mario Tennis . Select “Transfer” at the main menu, then select “Game Pak Check”. After it checks, an icon that says “Transfer N64 Characters” will appear. This will allow you to play as Bowser, Waluigi, Wario, and Yoshi.
Silver and Gold Rackets
Make sure you have the Iron Racket equipped, then go to the training courts. Go up to the lake and follow it until you see a boy practicing his swing. Tell him you do not like it and you will show him your swing. He will laugh, and you will get angry. Next, get ready to swing. In ten seconds, press A as many times as possible. If you press it 100 times, you will get the Silver Racket. If you swing it 150 times you will get the Gold Racket. Note: Try wrapping your hand in your shirt and rub it over A until it ends. You should be able to get either racket this way.
Unlock the Nintendo 64 characters, then check the mini-game screen. More entries should be available. To unlock even more mini-games, win the Junior, Senior, Varsity, and Traveling Leagues in Singles and Doubles.
If you lose a game in RPG mode, pause the game immediately before the score appears. Save the game, quit, then resume the game you were just playing. The game (not match or set) will be reset.