Just beat all the grand prix cups and youll unlock all the karts and for all 36 karts beat ALL the mirror mode cups
there's a new game coming in 2010 called, "sonic and sega all-stars racing", but no sonic karts.
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
Karts are legal on racetracks
Atari Karts happened in 1995.
Mario can have 8 karts and 8 bikes.
Atari Karts was created in 1995-12.
Get them at station cash shop but i dont think they have karts to buy.
ebay or search used Karts
King Boo, Bowser, Dry Bowser, Rosalina, and Funky Kong all use large karts on Mario Kart Wii.
No
Go-karts began afar World War II