King Boo is unlocked by completing the Leaf Cup. The King of Boos may float above his kart, but he's a fairly heavy racer who can knock aside lesser racers with his extreme top speed. The many outfits ...

A Free Play match between Rosalina and Boo from the charming and challenging Mario Tennis Aces. Unleash an arsenal of shots and strategies in all-out tennis battles with friends, family, and ...