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Mario Tennis 64

Unlock Baby Mario and Yoshi Court

Unlock the Baby Mario and Yoshi Court by beating the Mushroom Cup/Singles Tournament using Yoshi.

Unlock Donkey Kong Court

Unlock the DK court by beating the Mushroom Cup/Singles Tournament with Donkey Kong.

Unlock Donkey Kong Jr.

To unlock DK Jr, you simply have to complete the Star Cup/Doubles Tournament.

Unlock Shy Guy

To Unlock Shy Guy, beat the Star Cup/Singles Tournament.

Unlock Super Mario Bros. Court

Unlock the Super Mario Bros. Court by beating the Mushroom Cup/Singles Tournament using Mario.

Left-handed character

At the character selection screen, hold L while selecting a character to make them left-handed.

Handicap

At the character selection screen, hold R while selecting a character to make them have handicaps and be more powerful.

Mario Brothers court 2

Win all the Doubles Tournament Cups with Mario. Note: This is another Mario Brothers Court, but not the alternate way to get the previous one.

Mario/Luigi Castle court

Win the Star Cup Doubles and Singles Tournament with Mario.

Wario Brothers court

Win all the Doubles Tournament Cups with Wario.

Piranha Plant court

Note: This court only works in Piranha Plant Challenge. Complete any court (perfect, all 50 balls) in the Piranha Plant Challenge with any character.

Special Cups

Win 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 at the character selection

screen to access the Special Tournament in the menu.

Nintendo Ring tournaments

Select the "Special Games" option at the main menu, then choose the "Ring Tournament" selection. Enter "A3W5KQA3C" as a code at the code entry screen to play a tournament for the Mario Cup. Another code will be displayed after completing the tournament. The new code is not actually a code for the game, but is for ranking you with other players at Nintendo's Mario Tennis web site.

Enter "J6M9PQJ6U" as a code to play as Donkey Kong Jr. vs. Bowser in another contest.

Bonus difficulty level

To get a bonus difficulty level in exhibition mode win the planet cup with all sixteen characters.

Get the Cyriel court

Play with any character on the grass court then hold the ball 1 hour in the game with out make a point (this most be play in one player) if you do this correctly then you will get the cyriel court in this court you can make your own settings.

Secret of the Smash

You probably know that pressing A+B together on a star, you can create a powerful "Smash Technique". But, there is yet an even more powerful way to smash this nearly unblockable technique. Like before, go directly under an available star. You may also go up to the net. When the ball comes, hold up, and press A+B twice. If you want, CHARGE UP (holding up while pressing A+B repeatedly) the shot before hitting.

Birdo-Yoshi Court

This is really simple. Just win the star cup doubles tournament with Birdo. (Yoshi will be your doubles partner)

Trick Shots

This cheat works only if your opponent is on the baseline. If your opponent is on the base line and he/she just hit it charge up a trick shot by pressing B and A(B 1st then A). Then when he/she is close to the net press A and B(A 1st then B).

Unlock Metal Mario

From the main menu, select Special Games, and then Ring Tournaments. At that screen type in 'MMAR10PCN'. If done correctly you will hear a clanking sound.

Found at www.cheatrocket.com