I'm not sure what you mean by levels but here are some info about the game:
-4 type of Grand Prix: 50cc, 100cc, 150cc, 150cc Mirror.
-8 Cups: (In order from left to right, nitro first) Mushroom, Flower, Star, Special, Shell, Banana, Leaf, Lightning.
-32 different stages.
-7 missions (You have to unlock the 7th one)
You get one part per 50 coins
If you want to use Wi-Fi on either Mario Karts (Mario Kart Wii, Mario Kart DS) you must make sure you have a strong WEP connection.
You can if you play on 50cc. You need to play on either 100cc or 150cc in order to play the Special Cup.
Get at least third in the levels you got.
Go-Karts Plus's motto is 'Action Park of Williamsburg'.
Mario can have 8 karts and 8 bikes.
32
Nintendo
To get 36 karts on "Mario Kart DS", you have to come in first on every race and cup.
Yeah
bees
Get gold trophy in grand prixs to unlock karts and characters.
Loads!
By Beating cups
super Mario bros. has 32 levels.
When you hack the game.
COOL ones!