Blue Iron Knuckles are a color variant of Iron Knuckle and enemies in The Adventure of Link. They throw knives and try to hit at Link but also are skilled in blocking attacks. Link fights a Blue Iron Knuckle in different palaces, including the Island Palace, the Maze Island Palace, the Palace on the Sea, and the Three-Eye Rock Palace. Blue Iron Knuckles are usually guarding entrances or other types of things such as doors and keys.