keep playing
Loads!
Get gold trophy in grand prixs to unlock karts and characters.
COOL ones!
You do an amount of races or you can finish cc's.
you have to unlock the different karts by racing the world cups.
Just beat all the grand prix cups and youll unlock all the karts and for all 36 karts beat ALL the mirror mode cups
You beat all the mirror mode cups.
As you progress through the game, completing cups, you will unlock the different characters and karts.
You get one part per 50 coins
To unlock karts and characters, you can get them by doing Grand Prixs or Time Trials, or winning lots of wifi races. Or, you can simply play the game alot.
To get 36 karts on "Mario Kart DS", you have to come in first on every race and cup.
you have to complete certain things to unlock stuff. this website shows you how to unlock everything, including karts. http://www.videogamesblogger.com/2008/04/18/how-to-unlock-all-mario-kart-wii-secret-characters-bikes-karts-and-more-guide.htm