Nintendo 64, N64 Game Cheats
Mario Tennis
Also known as: Mario Tennis 64
Alt. name(s): MarioTennis, Mariotennis64

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Courtesy of: gamefaqs.com

HOW TO UNLOCK ALL CHARACTERS AND COURTS
Important note: This does not unlock the Mario's Star court, and will DELETE all your saved accomplishments.
On the Title Screen where you see 'Press Start', press:
Down, Down, Left, Left, Left, Right, Right, Right, C-Down, C-Down, C-Left, C-Left, C-Left, C-Right, C-Right, C-Right.
You will hear a sound to confirm and all of the goals will be marked as completed, including a gold star on all of the Ring Shot challenges.
Note: This cheat may not work on all versions of this game.. give it a try. 

UNLOCKING HINTS
How to unlock Shy Guy: Win the Star Cup/Singles Tournament. This character can already use the handicap cheat after being unlocked. You do not have to win the Star Cup as this character.
How to unlock Donkey Kong Jr.: Win the Star Cup/Doubles Tournament as any character. This character can already use the handicap cheat after being unlocked. You do not have to win the Star Cup as this character.
How to unlock the Donkey Kong court: Win the Mushroom Cup/Singles Tournament as Donkey Kong.
How to unlock the Yoshi and Baby Mario court: Win the Mushroom Cup/Singles Tournament as Yoshi.
How to unlock the Mario and Luigi court: Win Mushroom Cup/Singles Tournament as Mario.
How to unlock the Mario Brothers court 2: Win all the Doubles Tournament Cups as Mario. Note: This is another Mario Brothers Court, but not the alternate way to get the previous one.
How to unlock the Mario/Luigi Castle court: Win the Star Cup Doubles and Singles Tournament as Mario.
How to unlock the Super Mario and Wario Courts: Win the Mario mini-games for Mario and Wario in the Game Boy Color version of the game. Then, refresh data and send it to the Nintendo 64 through a Transfer Pak.
How to unlock the Wario Brothers court: Go through all the cups for Double Tournament with Wario.
How to unlock the Waluigi Court: Win the Medallion Match and set a new high score in challenge mode in the Game Boy Color version of the game. Then, refresh data and send it to the Nintendo 64 through a Transfer Pak.
How to unlock the Piranha Plant court: This court only works in Piranha Plant Challenge. Complete any court (perfect, all 50 balls) in the Piranha Plant Challenge with any character.
How to unlock the Birdo/Yoshi court: Complete the Star Cup Doubles as Birdo to unlock the Birdo/Yoshi court.
How to unlock the Max Difficulty: Win the Planet Cup with all sixteen players to enable Max Difficulty in exhibition matches.
The Special Cups: Go through all the Tournament Cups with all the characters (including Shy Guy and Donkey Kong Jr.) to unlock the Special Cups, which are much harder than the previous one. Press R while selecting a character to access the Special Tournament in the menu.
- The three Special Cups in order are Rainbow Cup, Moonlight Cup, and Planet Cup. Once you win a cup, you will move onto the next one.
Star player/handicaps: Note: Win the Star Cup with a character (get three cups in a tournament). Hold R while selecting that same character to make him have handicaps and make him more powerful. A yellow star will appear in the bottom right of the screen (for player one) or bottom left of the screen (for player two). Press L + R to have a left-handed player that is also a star character. Being a star player will enable you to serve stronger and play better. If you make Bowser a star player he will be able to serve up to 136 mph. Note: Donkey Kong Jr. and Shy Guy are already star players when they are unlocked.

NINTENDO RING TOURNAMENT PASSWORDS
Follow the steps below..
1. First of all, press Start at the title screen.
2. Highlight the letter S (Special Games) in the center of the bottom row and press A.
3. Highlight the trophy (Ring Tournament) icon, which is the third from the left and press A.
4. Enter the password below to play a tournament for the Mario Cup:
A3W5KQA3C
Another password will be displayed after completing the tournament.
The new password is not actually a password for the game, but is for ranking you with other players at Nintendo's Mario Tennis web site.
Below are other passwords.

Lets you play .... Password
The Nintendo Power Cup .... J6M9PQJ6U
The Blockbuster Cup .... ARM6JQARU
The IGN64 Cup .... V2UFMPUZM
The Pokemon.com Cup .... V5UFMPU5M
The MarioTennis.com Cup .... 48HWOR482
The Luigi Cup .... M1C2YQM1W
The Waluigi Cup .... LA98JRLAR
The Wario Cup .... UOUFMPUOM
The Donkey Kong Cup .... MM55MQMMJ
The Peach Cup .... OF9XFQOFR
The Bowser Cup .... N24K8QN2P
The Mr. Pickle's Cup .... 4YHWOR4Y2
The Yoshi Cup .... ZKZLZKNNR
The WimbleDonkey Kong Cup .... 5G3LTQ5GN

HINTS, TRICKS AND PLAYING TIPS
How to execute a rocket shot: Press A + B for a rocket shot. This also works when serving. If done correctly, a purple streak will appear after you hit the ball.
How to execute a slow shot: To do this press B, then A.
How to execute a lob shot: To do this press A, then B.
How to control the ball: This trick can be done with any player, against any player. Hold Analog-stick Left or Analog-stick Right as you hit the ball. This will send it in whichever direction you pushed the stick.
How to get a Left-handed character: Hold L while selecting a character to make him/her left-handed.
How to get a better chance of winning: When playing against the CPU, if you win a game or a set (in the final of the cup), save the game, then start again. In case you lose, you can continue the game and start with the advantage.
How to get a better chance of winning (2): When playing against the CPU, press B then A for a slow shot close to the net, then run up to the net. After your opponent hits it, quickly hit the ball away from him. The ball will zoom by him, leaving him no time to react, and giving you an extra point.
How to get a better chance of winning (3): Try to get in the front row. Then, go in front of the opponent closest to the net. If the opponents happens to change rows, stay in front of the person closest to the net. Leave a little space between you and the net. Then, when the ball is headed toward you, save up as much power as possible then hit the ball over the opponent that is closest to the net, and right in front of you. If done correctly, the ball will go over one opponent's head and his or her partner will either be too far away to hit it in time or barely hit the ball.
How to switch court sides: If you do not like being on the other side of the court, press Start, choose "Camera Options", then "Player Cam". You will now be on the closest side throughout the game.
How to get a face smash: You can do this trick with any character, but Shyguy is recommended. When your opponent pops the ball up, start charging up and press Away. Just when you are about to hit the ball, press Forward. This will usually hit your opponent in the face.
How to get easy points in Doubles: Whenever your partner is serving, get next to the net. Hopefully, your opponent will send a high ball, allowing you to smash it and score.
Fun hint: Ball Disappears: In Piranha Challenge when a ball hits the net and bounces back on your side. Run into it and it will disappear. Note: This doesn't help you in the game, it's just cool.

SPECIAL GRAPHICS
If you have selected to be a Star Player, you will notice that when you do a charged shot a special graphic will appear around your character briefly. The following is a list of the special graphics that will appear for each of the normal A and B shots, not including the Slice Spin (Purple Shot).
Mario: Yellow stars
Luigi: Nothing
Peach: Hearts
Baby Mario: Small yellow stars
Yoshi: Rainbow appears behind racket
Donkey Kong: Blue stars (Charged Slice) or orange stars (Charged Top Spin)
Paratroopa: Feathers
Donkey Kong Jr: Blue and green stars (Charged Slice) or green stars (Charged Top Spin)
Wario: Blue stars (Charged Slice) or orange stars (Charged Top Spin)
Waluigi: Nothing
Daisy: Unknown
Toad: Unknown
Birdo: Nothing
Bowser: Blue Stars (Charged Slice) or orange stars (Charged Top Spin)
Boo: Unknown
Shy Guy: Will have just a red tennis racket

Submitted by: A.Taylor (AZe), AJ, Big 'H', Milly A, **MarioStarplayer** and CheatBookJon

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