This game is also available on GBC.
Retro Game Cheats for Mario Tennis (Nintendo 64)
Effect: Unlocks Donkey Kong Jr.
When:
While playing.
How:
Finish star cup in Doubles mode.
Submitted By:
Freeola
Effect: Unlocks Shy Guy.
When:
While playing.
How:
Finish the star cup in singles mode.
Submitted By:
Freeola
Effect: Unlocks the Birdo court.
When:
During Game.
How:
To unlock the Birdo and Yoshi court, select Birdo as your character and choose Doubles with Yoshi as your partner. The new court will be unlocked when you finish Star Cup.
Submitted By:
Freeola
Effect: Gets Yoshi & Baby Mario court
When:
In mushroom cup singles tournement
How:
Win mushroom cup singles tournement with yoshi
Submitted By:
Freeola
Effect: If you find it easier to play at the bottom of the screen then you will always be there no matter who is serving.
When:
During any tournament match
How:
Pause the game and change the camera to player camera
Submitted By:
Freeola
Effect: Get Mario and Luigi court
When:
During the game, with Mario as your player
How:
Enter And Win The Star Cup Doubles Tournamnet
Submitted By:
Unknown
Effect: Mariotennis.com cup
When:
At ring Tournaments
How:
From the Main Menu, select Special Games, then Ring Tournaments. Enter "48HWOR482" to unlock the Mariotennis.com Cup
Submitted By:
Unknown
Effect: unlocks Luigi cup
When:
at the password screen
How:
type in M1c2yqm1w
Submitted By:
Unknown
Effect: unlocks IGN64 cup
When:
at the password screen
How:
type in v2ufmpuzm
Submitted By:
Unknown
Effect: makes the character be left handed
When:
when selecting a character
How:
hold L at the character you want to be.
Submitted By:
Unknown
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