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Walk faster
Hold B while walking.

Castle Court
Play Luigi's Shooting Star mini-game and win both levels. When you get to the third level, beat the high score of 60. You can now play on the Castle Court in linked play and exhibition modes.

Wario Warehouse court
Defeat all the Mario characters in exhibition mode, including the Nintendo 64 characters.

Tropics Court
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. You can now play on the Tropics Court in linked play and exhibition modes.

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.

Always win
Select adventure mode. If the score is 40-0 for your opponents, save and quit. When you restart the game, it will be 0-0 again. The game only counts games and sets.

Star Court
Get every Medal and Gold Trophy in single player mode. After that, you must win Mario's Mini Game, Boo Blast's High Score. The Star Court will now appear at the course selection screen.

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
Complete the game in Singles

Playing in any of the training rooms, competitions, matches, etc.
When you are on the court, position yourself in the center (or just slightly behind center ) when playing. This allows you to be able to move quickly to any position on the court, because you are the same distance from any point. After a return or serve, go back to that position to prepare for a return ball. This will help you greatly in your advancement and allow you to win and return more balls, giving you more experience points, and allowing you to dominate the court more.

When playing against an opponent or in the training, read where the ball will be going. If the opponent or the machine goes to one of the upper or lower corners, position yourself between the center of the court and the sideline closest to where the your opponent is positioned. This will allow you to return the ball easily if it goes to the sideline or to the center of the court. The same thing works if the opponent goes to the upper center or lower center. If upper, stand in the center because you will have enough time to react because of the distance. If the opponent comes close, go back slightly to get more time to react.

When playing on the Wall trainer, if you stand close and can react quickly, you will be able to return the ball rapidly to the wall, allowing you to get the 50 returns goal quicker: Note: This will not always work; it depends on how quickly you can move and hit the ball without hitting the rotating pads and alternating high and low returns. This is most difficult when you reach the higher levels where there are faster and more pads to avoid. When you get to the higher levels, stand about center back and alternate high and low hits. This will work most, but not all of the time. Just remember your ball return power. The speed will also be a determining factor in how you can control and receive the ball

When you finish all four levels in both training rooms, your next goal will to beat your previous record. When you get to your highest number of returns, beat it by one and then miss the ball. This should give you good experience points, but allow you to keep playing it for awhile since your goal each time will be just one higher.
Game: Mario Tennis. Platform: GameBoy Color. Type: Cheat / Cheat Code / Hints / Tips. Cheat ID: 7187. This cheat was added on Oct 1, 2002

Jungle Court
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. You can now play on the Jungle Court in linked play and exhibition modes.

Game reset
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.

Always the Island Open Tournament
Get to the Island Open Tournament. Immediately press A + B + Start + Select when the match starts to win that round. Repeat this four times to instantly win the tournament.

More mini-games
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.

Play as Peach
Complete the game in Doubles

More experience
After you have completed all of the wall mini-game levels, talk to the girl in front of the door that is preventing you from walking in. She will ask you if you are ready for the master level of practice. Press B and she will ask if want to try for an even easier level of practice. Answer "Yes". Then, walk on any of the level numbers and press A. You will get more experience.

When you enter the traveling team in singles mode, you will have new equipment. Go to the training center and equip the Iron Shoes or the Iron Racket. They both give you 150% more experience when you win a match.