Missile Bills are enemies in New Super Mario Bros. Wii. They are a sub-species of Bullet Bills who home in on the player. They only appear in World 9-3 of World 9. In this game's Prima guide, Missile Bills are known as Heat-Seeking Bullet Bills. They flash from black to burgundy constantly while homing in on the player. Missile Bills are fired from Bill Blasters. They can change the angle they are flying at and will not stop pursuing the player unless they are defeated or the player is too far. Missile Bills will hurt the player if he touches them. To defeat a Missile Bill, the player can either jump on it, freeze it with an ice ball from an Ice Flower and Ground Pounding the ice block it is trapped in. Missile Bills are the only Bullet Bills that appear in World 9-3, along with their new sub-species, Missile Banzai Bills.