finish the star cup on mirror mode ok ok that's how i pretty sure
win the 50cc star cup
50cc cup is where you unlock king boo
Petey Piranha's (and King Boo's) special item in Mario Kart: Double Dash!! is randomly the special item of any other character.
king boo toad and toadettee and peaty pirahna
Play all the cups on all the different diffucalties
yes there are 4 and they are Toad Toadette King Boo and Petey Piranha
Mario kart 7 it is so awseome i love playing it on my wii-u
You can't unlock him. You can only play as "King Boo" on "Mario Kart Wii".
Nope. But if you use the babies or King Boo or Petey Pirahna, then you can get a Chain chomp as an item.
There are 20 Characters. Mario, Luigi, Peach, Daisy, Yosh, Birdo, Baby Mario and Luigi, Koopa Troopa, Para Troopa, Donkey Kong, Diddy Kong, Toad, Toadette, Petey Piranha, King Boom Bowser, Bowser Jr.
King Boo
Yes, there are 4 unlockable characters: Toad, Toadette, King Boo, and Petey Piranha. To get Toad and Toadette, get a gold trophy on 100cc Special Cup, while to unlock King Boo and Petey Piranha, get a gold trophy on Mirror Mode Star Cup.
50cc star cup
King Boo, Bowser, Dry Bowser, Rosalina, and Funky Kong all use large karts on Mario Kart Wii.