Mario Kart cheats and cheat codes for Nintendo DS

Unlock Leaf Cup: Be a 1st on Shell Cup and Banana Cup
Unlock Lightning Cup: Be a 1st on Leaf Cup
Unlock Star Cup: Be a 1st in the Mushroom Cup and Flower Cup
Unlock Special Cup: Be a 1st a Gold trophy in the Star Cup
Unlock Mirror Mode: Be a 1st Gold trophies in all cups
Unlock mission 7: Reach minimum 1 Star rank on every level of missions 1 - 6
Unlock Rainbow Cup: Defeat all the Staff Ghost Data on Retro tracks

Unlock 3 extra karts: Reach a 1st place in every cups in the Nitro GP 100cc class
Unlock Daisy: Reach a 1st place in every cups in the Nitro GP 50cc class
Play as Dry Bones: Reach a 1st place in every cups in the Retro GP 50cc class
Unlock Play as R.O.B: Reach a 1st place in every cups in Retro Mirror mode 150cc class
Unlock Shy Guy: Play a Download Play game against your friend
Unlock Waluigi: Reach a 1st place in every cups in the Retro GP 100cc class
Unlock alternate title screen: Finish all classes with gold trophies on all cups  
Unlock changed ending screen: Reach a 1st place in every cups and classes
Mark yur name with with star: Get all the cups in every classes with minimum a 1 Star rank
Submitted by: dancermeg8393

Choose any kart for each character:
Reach a 1st place in every cup in the Grand Prix on 150cc mirror that you didn't 
use to unlock R.O.B.  

Select from 7 Karts for each character:
Reach a 1st place in every cup in Nitro Grand Prix on 150cc