The Egg Guardian is able to attack by launching its fists at its foes. After doing so, it will rotate its upper torso using machine guns hidden behind its lower arms. The arms will regenerate after a certain period of time. The Egg Guardians cannot be paralyzed by Silver's Psychokinesis while their two fists or spheres are still attached to their bodies.
When hit while its arms are detached, the Egg Guardian will fall over and eject its energy core. Repeated strikes to the core or the use of Silver's Psychokinesis will destroy the robot. To deal damage without being hurt in Sonic and Shadow's case, the player has to attack the Egg Guardian before it launches its fists, as it will either hurt the player from its explosion or hurt the player when it falls.
Egg Keepers are the advanced versions of the Egg Guardians. They are similar in appearance, but have a red and grey color scheme as well as increased speed and armor. Their attacks are similar to the Egg Guardians but the only difference is that after their fists or spheres are destroyed, they will launch volcanic lasers instead of firing a machine gun.