Bulls-Eye Bill, (or Missile Bill, Heat-Seeking Bullet Bills in the New Super Mario Bros. Wii Prima Guide), is a variation of Bullet Bills and they have first appeared in Super Mario Bros. 3. The Bulls'-Eye Bill shoots straight unless Mario gets within its sight range, he then locks onto Mario and follows him. Like Bullet Bills, Bulls'-Eye Bills are explosive. They reappear in Super Mario Sunshine after a thirteen year absence, they change from black to purple and appear in Pinna Park.