The Boo is an item who appears in every game from Super Dry Bones Kart to Dry Bones Kart DS (the first five Dry Bones Kart games). When activated, the Boo selects a racer with the best item in reach, and steals the item and gives it to the player who released him. At the same time, the player obtains total invisibility and invincibility for a short period of time. While invisible, the player can pass the items, the course obstacles and the other racers more easily by simply going through them. If no other players have any items, the Boo will return empty handed.