Hammer Bro., also known as Hammer Brothers or Hammer Bros. is a recurring enemy in the Mario series of video games. Created by Japanese video game designer Shigeru Miyamoto, it is a subspecies of Koopa Troopa that walks upright and attacks by throwing hammer projectiles at the player character. Different variations of the Hammer Bro., named after the type of projectile they throw, include Boomerang Bro. Fire Bro, and Sumo Bro. The Hammer Bro. has appeared in nearly every Super Mario game since its first appearance in Super Mario Bros., also appearing in various animated and printed adaptations of the franchise.