Cheat Codes
Most of the Magic Codes you enter do not work in Adventure mode, but they will work in the tracks mode. Also, after you enter the codes, they will stay there until you turn your N64 off. Once you do that, all the codes you entered will go away, and you'll have to enter them again.
Rare removed the High Speed Racing code just before release. There is no code, even if you see it in magazines and Player's Guides.
WHODIDTHIS - Enter this code and you can see who's responsible for this masterpiece.
FREEFRUIT - Begin each race with ten bananas.
DOUBLEVISION - Players can be the same racer in multiplayer mode.
TOXICOFFENDER - All of the weapon balloons are green.
OPPOSITESATTRACT - All weapon balloons are rainbow.
BODYARMOR - All of the weapon balloons are yellow.
BOMBSAWAY - All balloons are red.
ROCKETFUEL - Weapon balloons become blue.
NOYELLOWSTUFF - All bananas are gone in multiplayer mode.
BYEBYEBALLOONS - You and the computer cannot use weapons.
JOINTVENTURE - More than one player can play in Adventure Mode.
TIMETOLOSE - Computer racers become more expert. (They race similar to T.T. but it is easier because of balloons.)
BLABBERMOUTH - Instead of honking your horn, your character will make a sound.
BOGUSBANANAS - Bananas actually make you slower.
VITAMINB - Even after you get ten bananas, bananas will still make you faster.
ZAPTHEZIPPERS - No more zippers can be found around the tracks.
FREEFORALL - Balloons become fully powered-up or level 3, when you get one.
ARNOLD - Racers become larger. (Somewhat easier to collect silver coins.)
TEENIEWEENIES - Racers become smaller than normal. (Makes it easier to wind through turns on plane races.)
OFFROAD - Four-wheel-drive. Makes your car go just as fast on rough terrain (grass, snow, etc.) as they do on the road.
JUKEBOX - Music test. Go to the AUDIO OPTIONS on the OPTIONS menu to use it.
I've done it! I've looked everywhere, asked everyone, and done everything! I've found some DKR Game Shark Codes. Game Shark is a thing like Game Genie, but for the N64. I think it goes into the controller, or the N64 base. If it goes in the N64, then the game is stuck in the Game Shark. There is also a SharkPad, a different kind of controller. You can buy the Game Shark separately. Here they are. Note: You need a newer version of Game Shark for these codes.
Master Code (must be on) DE004000 0000
99 balloons 801FCBED 0063
Enable all characters 810DFD9A FFFF
Always have 50 bananas at Ancient Lake 801E342D 0032
Always have 50 bananas at Fossil Canyon 801E68CD 0032
Always have 50 bananas at Jungle Falls 801E45CD 0032
Play as Drumstick 810DFD9E 0002
Horn cheat 810DFD9E 0100
Mirrored tracks 810DFD9E 0004
Display credits 810DFD9E 0400
High Speed Racing 810DFD9E 0008
Disable weapons 810DFD9E 0800
Big characters 810DFD9E 0010
Disable bananas 810DFD9E 1000
Small characters 810DFD9E 0020
Bananas reduce your speed 810DFD9E 2000
Music Menu 810DFD9E 0040
Unlimited bananas 810DFD9E 4000
Start with 10 bananas 810DFD9E 0080
All balloons are Red 810DFD9E 8000
Activate all cheats 810DFD9E FFFF
Play as T.T. 810DFD9E 0001