Boo Steals an merchandise from a randomly selected racer in front of the player, even though granting momentary invisibility, creating the player invulnerable and capable of pass through hazards. Karts, bikes, and ATVs all return in Mario Kart World, the latter two subsequent their absence in Mario Kart Tour. https://mysterybookmarks.com/story19838757/mario-kart-world-no-further-a-mystery