The Blue Spiny Koopa Shell also known as Spiny's Shell, Koopa Shell, or simply Blue Shell is a usable item from the Mario Kart series that made its first appearance in Mario Kart 64. In Mario Kart games The Blue Spiny Koopa Shell appears as an item from the item box, with the general purpose being to target the player in the first place, a leader in the race, and it inflicts more damage to that racer. Aside from the Mario Kart games The Blue Spiny Koopa Shell also appears in some Mario Sports games, where it serves as a power-up. As in Mario Kart The Blue Spiny Koopa Shell, it is easily one of the most powerful items due to its random nature and being hard to avoid. A fanart Mario Kart game progress bar for YouTube with The Blue Spiny Koopa Shell.