The Iron Ball (鉄球) is a trap that appears in Super Bomberman 4. It is an invincible ball that can be moved around the stage. When the Iron Ball is hit with an explosion, it will begin to move in the opposite direction of the explosion, blocking the blast as if it were a Hard Block. When it collides with an obstacle, it will turn left or right respective to its current direction, and will reverse its direction if it cannot turn. It destroys Soft Blocks upon collision.
Players who are hit by the Iron Ball will be stunned briefly and will have some of their items scattered. The Iron Ball's direction is not changed when it collides with a player. Due to its explosion-blocking property, players may use the Iron Ball as a last resort to guard themselves from explosions.