Mario Tennis is the GBC tie-in to the Nintendo 64 game of the same name. This one has a story mode thrown into the mix, along with a slew of human characters, most of whom haven't shown up since.
Set RAM address $FF9E to 02 or use GameShark code 01029EFF. This will enable a debug display function. The double speed switch function is called which is required to render the game and output the information of the previous frame simultaneously.
GameShark code 01019EFF enables a debug menu, accessed by pressing A once the player can move around in story mode.
Map Select. Choose a map with the D-Pad, then press A, B to go to the chosen map. The debug rooms below can also be accessed from here.
Figure out what "- ENTER NO -" does.
Does exactly what it says on the tin, allowing both the player and their doubles partner's stats to be leveled up.
Edits the palette of the current room. Use the D-Pad to choose a color, A to display the chosen color's RGB values, and the D-Pad to edit them.
Flag editor. Use the D-Pad to select a flag and A to enable/disable it.
Find out what each flag enables.
There are three debug rooms and one menu in this game. They can be accessed via the scene select in the debug menu, or by editing ROM address $40A9, or by using the Game Genie code ??0-A9B-E6A where ?? is one of the following IDs, then resetting the game.
An empty room featuring with a star background. What it may have been used for is unknown.
Small Char. Test
As its name implies, this room tests the sprites for the story overworld. There are 12 characters strewn across the field. Talking to Alex causes the player's sprite to be cycled through the four main players. Talking to Waluigi (top) makes the player's sprite cycle through every character's sprites, starting with Mario. Yoshi makes your character nod their head. And Bowser makes your character shake their heads. Talking to any of the other characters seems to do nothing.
Another room with lots of characters, each with functions. Any matches won with this has sepia-toned screens with the text "You did it!", and then you're brought back here. Also, any time you lose a Mini-Game with this, the same screen shows up, saying "You failed... Error Code 0".
- Green Girl - Choose from the Story Mode Singles matches.
- Green Boy - Choose from the Story Mode Doubles matches.
- Green Shadow-Server - Choose from the Training matches.
- Green Cat - Says "You two are good. I'll admit that... But remember this." Possibly a text test.
- Leg-Lifter (Left) - Choose from Mario Mini-Games.
- Leg-Lifter (Right, Top) - Plays Credits with game clips.
- Leg-Lifter (Right, Bottom) - Plays Credits without game clips.
- Emily - Goes to the Story Mode character select screen. Whichever character you choose, you'll change into.
- Great Fairy of Victory - Shows the tournament charts. After seeing both Singles and Doubles, the game stops.
A sepia-toned menu that seems to not really function. It's likely that most of its features were removed before the game's release. The only thing it does besides crash the game is transport you to the Training Court, facing one of the three coaches. Given this function, this was probably an area select for the Story Mode areas.
(Source: nensondubois for accessing the test rooms and menu.)
Where these tracks may have been used is a mystery. Tracks 23 and 24 are located among the minigame themes in the game's music file.
In addition to the background, the Japanese version has different subtler animation.
The dictionary cover has quite a few differences between regions. The logo was (obviously) changed, the large "T" on the cover was replaced with a tennis ball, and the girl is in a different pose.
Virtual Console Changes
Because there is no support or emulation for the Nintendo 64 Transfer Pak, data cannot be shared with the Nintendo 64 Mario Tennis. This makes characters Yoshi, Wario, Waluigi, and Bowser, their minigames, and the Warehouse Court inaccessible. Additionally, like most Game Boy Color games for Virtual Console, the Game Link Cable is not supported or emulated, so 2 player mode is inaccessible.
|NES/FDS||Super Mario Bros. • Super Mario Bros 2. (FDS) • Super Mario Bros. 2 (NES) (Prototype, Doki Doki Panic) • Super Mario Bros. 3|
|SNES||Super Mario World • Super Mario All-Stars • Super Mario World 2: Yoshi's Island (Prototypes)|
|Satellaview||BS Super Mario USA • BS Super Mario Collection|
|Nintendo 64||Super Mario 64 (64DD Version)|
|GameCube||Super Mario Sunshine (Demo)|
|Wii||Super Mario Galaxy • Super Mario Galaxy 2 • New Super Mario Bros. Wii|
|Wii U||New Super Mario Bros. U • New Super Luigi U • Super Mario 3D World|
|Game Boy (Color)||Super Mario Land • Super Mario Land 2: 6 Golden Coins • Wario Land: Super Mario Land 3 • Super Mario Bros. Deluxe|
|Game Boy Advance||Super Mario Advance • Super Mario Advance 2 • Super Mario Advance 3 • Super Mario Advance 4|
|Nintendo DS||New Super Mario Bros. • Super Mario 64 DS|
|Nintendo 3DS||Super Mario 3D Land (Demo) • New Super Mario Bros. 2|
|Nintendo Switch||Super Mario Odyssey • New Super Mario Bros. U Deluxe • Super Mario 3D All-Stars • Super Mario Bros. 35 • Super Mario 3D World + Bowser's Fury|
|iOS/Android||Super Mario Run|
|Console Games||Super Mario Kart (Prototypes) • Mario Kart 64 (iQue Prototype) • Mario Kart: Double Dash!! (Demos) • Mario Kart Wii (Mario Kart Channel) • Mario Kart 8 (Deluxe)|
|Handheld Games||Mario Kart: Super Circuit • Mario Kart DS (Demos) • Mario Kart 7 • Mario Kart Tour|
|Arcade Games||Mario Kart Arcade GP • Mario Kart Arcade GP 2 • Mario Kart Arcade GP DX|
|Super Mario RPG||Legend of the Seven Stars|
|Paper Mario||Paper Mario • The Thousand-Year Door (Paper Mario 2 Demo) • Super Paper Mario • Sticker Star • Color Splash • The Origami King|
|Mario & Luigi||Superstar Saga (+ Bowser's Minions) • Partners in Time • Bowser's Inside Story (+ Bowser Jr.'s Journey) • Dream Team • Paper Jam|
|Console Games||Mario Party • Mario Party 2 • Mario Party 3 • Mario Party 4 (Demo) • Mario Party 5 (Demo) • Mario Party 6 (Demo) • Mario Party 7 • Mario Party 8 • Mario Party 9 • Mario Party 10 • Super Mario Party • Mario Party Superstars|
|Handheld Games||Mario Party Advance • Mario Party DS|
|Web Games||Mario Party 7: Bowser's Lair Hockey|
|Golf||NES Open Tournament Golf • Mario Golf (Nintendo 64, GBC) • Mario Golf: Toadstool Tour • Mario Golf: Advance Tour • Mobile Golf|
|Tennis||Mario Tennis (Nintendo 64, GBC, Virtual Boy) • Mario Power Tennis • Mario Tennis: Power Tour - Bicep Pump • Mario Tennis Aces • Mario Tennis: Power Tour|
|Strikers||Super Mario Strikers (Demo) • Mario Strikers Charged|
|Mario & Sonic at the Olympic Games||Beijing 2008 (DS, Wii) • Vancouver 2010 (Wii) • London 2012 • Rio 2016 (Wii U)|
|Other||BS Excitebike Bunbun Mario Battle Stadium • Super Mario Bros. + Duck Hunt + World Class Track Meet • Dance Dance Revolution Mario Mix • Mario Superstar Baseball (Mario Baseball Demo) • Mario Sports Mix • Mario Pinball Land|
|Console Games||Dr. Mario (Prototypes) • Tetris & Dr. Mario • Dr. Mario 64 • Dr. Luigi|
|Handheld Games||Dr. Mario • Dr. Mario & Puzzle League • Dr. Mario World|
|Web Games||Dr. Mario: Vitamin Toss|
|Super Mario Maker|
|Console Games||Super Mario Maker • Super Mario Maker 2|
|Handheld Games||Super Mario Maker for Nintendo 3DS|
|Mario vs. Donkey Kong|
|Handheld Games||Mario vs. Donkey Kong (Demo) • Mario vs. Donkey Kong 2: March of the Minis (Demo) • Mario vs. Donkey Kong: Minis March Again! • Mario vs. Donkey Kong: Mini Land Mayhem!
|Console Games||Mini Mario & Friends: amiibo Challenge|
|Console Games||Mario Paint (Prototype) • Mario no Photopi • Mario Artist Paint Studio (Prototype) • Mario Artist Talent Studio • Mario Artist Communication Kit • Mario Artist Polygon Studio|
|Arcade Games||Mario Bros. • Donkey Kong, Donkey Kong Jr., Mario Bros.|
|Console Games||Mario Bros. • Kaettekita Mario Bros.|
|Handheld Games||Mario Bros. Classic • Mario Clash|
|Console Games||Luigi's Mansion • Luigi's Mansion 3|
|Handheld Games||Luigi's Mansion • Luigi's Mansion: Dark Moon|
|Arcade Games||Luigi's Mansion Arcade|
|Console Games||Mario's Super Picross|
|Handheld Games||Mario's Picross • Picross 2|
|Computer Games||Mario is Missing! (DOS) • Mario's Early Years (DOS)|
|Console Games||Mario is Missing! (NES, SNES) • Mario's Time Machine (NES, SNES) • Mario's Early Years (Fun With Letters)|
|Arcade Games||Donkey Kong • Donkey Kong Jr. • Donkey Kong, Donkey Kong Jr., Mario Bros.|
|Computer Games||Donkey Kong (Atari 8-bit family) (Prototype)|
|Console Games||Donkey Kong (NES) • Donkey Kong Jr. (NES)|
|Handheld Games||Donkey Kong (Game Boy)|
|Console Games||Wrecking Crew • Wrecking Crew '98|
|Arcade Games||Mario Roulette|
|Computer Games||Mario's Game Gallery|
|Console Games||I am a Teacher: Super Mario no Sweater • Nintendo World Championships 1990 • Mario & Wario • Undake 30: Same Game Mario Version • Yoshi's Safari • Hotel Mario • Super Mario's Wacky Worlds • Fortune Street • Captain Toad: Treasure Tracker (Wii U, Switch) • Mario + Rabbids Kingdom Battle|
|Handheld Games||Jaguar Mishin Sashi Senyou Soft: Mario Family • Super Princess Peach • Captain Toad: Treasure Tracker (Nintendo 3DS) • Photos with Mario|
|Yoshi • Donkey Kong • Wario|