Diddy Kong Racing Cheats (Nintendo 64)

Right before the announcer says GO! press A to go faster.
  There are 2 free ballons. One on the island where the Taj is and the other is when you
come on the river, veer right and it should be there.

BLABBERMOUTH - In stead of normal horn you hear your character
  JOINTVENTURE - Two players can play the adventure mode
  BODYARMOR - All balloons turn yellow
  OPPOSITESATTRACT - All balloons wil get a rainbow color
  TOXICOFFENDER - All balloons turn green
  BOMBSAWAY - All balloons turn red
  ROCKETFUEL - All balloons turn blue
  BYEBYEBALLOONS - The computer can't use weapons against you
  VITAMINB - You can grab unlimited bananas
  BOGUSBANANAS - Bananas slow you down
  NOYELLOWSTUFF - There are no more bananas
  ZAPTHEZIPPERS - There are no more zippers
  TIMETOLOSE - The AI of the computer is enhanced, the game gets harder
  FREEFORALL - Each balloon gives you a level 3 powerup of the balloon you grab
  FREEFRUIT - You start with 10 bananas
  JUKEBOX - There is a music test in the audio options screen
  ARNOLD - The racers get 4 times as big
  TEENYWEENIES - The racers get times as little
  DOUBLEVISION - Two players can play with the same character
  WHODIDTHIS - You see the credits
  OFFROAD - You don't lose speed if you hit off the road

2X-Boost-Right Before you hit a boost, let go of the accellorator. If done right you will
get a green fire and rainbow smoke.

DINO DOMAIN
  You will find the key on the Ancient Lake track. After the first set of balloons, go
off the track on the right, here you will encounter a little ski jump. De key is on top
off the jump.

  SNOWFLAKE MOUNTAIN
  You will find the key on the Snowflake valley track. From the start of the race, go
left off the track. Follow the track a short while and you the see the key at the right.

  SHERBERT ISLAND
  The key is on the Crescent Island track. Use the hovercraft for more speed. At the
start of the race you can go either left or right. Go left and straight ahead until you
encounter water. The key is in a gap of a stone at the right side.

  DRAGON FOREST
  The key is on the Boulder Canyon track. Go to the wooden bridge that leads towards the
castle. Behind the bridge there is a bell with a blue balloon. Grab the balloon and wait
until it returns and grab it two times more until you have a level 3 boost. Drive below
the bell facing the bridge and if it's ok, the bell will sound and the bridge will raise.
Drive onto the bridge and use the boost. You will land at the keycodes. Go to the options
menu, go to the magic codes and enter them here.

When wiz-pigs mouth is open look for a two fetherd frog - run over him and play as a
rooster . ( he will appear when you do )

You can play like TT the Clock by defeating him in each course. TT has the best average
properties.
  After the speaker shouted 'Get Ready' and the words disappear, you have to hold A for a
boost.
  To go to Space World, you must have all the trophies and amulets. Then, go to the
lighthouse. This will change to a rocket and bring you into space.
  To play with the chicken you have to get all amulets and go to the center and splash a
frog on the red spot.
  To make more sharper turns, hold R and press B.
  Before you go through a Zipper, let go off A until your boost is empty. The boost will
take 2 times as long.
  When you finished the game in Adventure mode, you can play it in Adventure mode 2. All
golden balloons are now silver, all tracks are inverted and all opponents are twice as
difficult.