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Sonic News Network
Sonic News Network

The Egg-Robo[1] is a character that appears in the Sonic the Hedgehog series. It is a mass-produced Badnik model based on their creator, Dr. Eggman, and the counterpart of the Eggrobo from an alternate dimension set in the recent past.


Egg-Robos are egg-shaped robots based on Dr. Eggman's likeness. Their middle torso is red with yellow downward-pointing triangles on the front while their lower torso is black with two silver buttons on the front. Their gray head area is clean with two small red eyes and a flat jaw fastened by yellow bolts. On their back they have two yellow and gray rockets for flight. They also have thin robotic arms and legs with round shoulders, white gloves and black shoes with white straps.


An Egg-Robo on a high-speed transportation vehicle in Titanic Monarch Zone Act 1, from Sonic Mania.

In Sonic Mania, and its expansion Sonic Mania Plus, the Egg-Robos make a few appearances, although not as enemies. The games also introduce a group of elite Egg-Robos known as the "Hard Boiled Heavies" who are essentially Egg-Robos modified by the Phantom Ruby.

Four Egg-Robos appear during the boss battle with the Heavy Gunner in Studiopolis Zone Act 1. During the battle, they chase after the Auto Running player. One of them will hand the Heavy Gunner his bazooka, while another one pilots the Heavy Gunner's helicopter and rest of them fly around wielding batons. These Egg-Robos cannot harm the player and vise-versa. Instead, the player has to knock blue missiles back at each of them one at the time. These Egg-Robos do not release Animals after defeating them.

In Titanic Monarch Zone, Egg-Robos appear as drivers of high-speed transportation vehicles that move along rails. Hopping into these vehicles on one end of these rails will transport the playable character to the other end of the rail. However, the vehicle and the Egg-Robo will get smashed into a wall upon reaching the end, while the player gets tossed out of the vehicle without taking damage (if they have not jumped off earlier).

Powers and abilities

Thanks to the jetpacks in their backs, the Egg-Robos are capable of flight at speeds that rival Sonic's, who can run at supersonic speeds[2] (which ranges from 915-3,840 mph). They are also capable of driving vehicles such as helicopters.


Hard Boiled Heavies

Main article: Hard Boiled Heavies

The Hard Boiled Heavies, from Sonic Mania.

The Hard Boiled Heavies are a line of five elite Egg-Robos that handled Dr. Eggman's most dangerous missions. This group consists of the Heavy Gunner, the Heavy Shinobi, the Heavy Magician, the Heavy Rider, and the Heavy King.

Originally normal Egg-Robos, all members of the Hard Boiled Heavies got transformed into customized and distinct versions of themselves after coming into contact with the Phantom Ruby. While this transformation made them more powerful, it also granted them free will, making it harder for Eggman to control them.

See also


  1. Sega. "Story So Far". Sonic Mania Introduction Manual. Sega. p. 1. "Some time after saving Angel Island, Sonic the Hedgehog and his best friend, Miles "Tails" Prower, are relaxing when Tails picks up a strange energy reading far away. Though different from the Chaos Emeralds, the reading is remarkably powerful, and Tails convinces Sonic to join him to check it out. Sonic and Tails take off on the Tornado towards the source, but sure enough, the evil Dr. Eggman has detected it too! Now it's a race between Sonic and Eggman to get there first and figure out what mysteries it holds. However, Eggman has been busy: he's just unleashed a new team of elite Egg-Robos to handle his most important tasks. They're called the "Hard-Boiled Heavies," and they're about to reach the source of the signal first! It's up to Sonic, Tails, & their newest ally, Knuckles the Echidna, to defeat the Hard-Boiled Heavies, unlock the secrets of the energy source, and stop Dr. Eggman!"
  2. Sonic Generations (PlayStation 3) European instruction booklet, pg. 5.

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