The Hard Boiled Heavies[1][2] are a group that appears in Sonic Mania. They are a line consisting of different Egg Robo models created by Dr. Eggman.[3] They work in private, but appear in front of Sonic many times over the course of his adventure. However, this evil group eventually evolves into something even Eggman could not predict.[1]

Concept and creation

Christian Whitehead came up with the Hard Boiled Heavies after imagining Eggman entering a state of depression after Sonic the Hedgehog 3 & Knuckles; instead of going after Sonic, he would merely lounge at home in his pajamas and that the abandoned Egg Robos would go "a little mad." After thinking about this concept, the term came into being. [4]


In the gameplay of Sonic Mania, the Hard Boiled Heavies fill the roles of bosses in each Zone's Act 1,[5] each one of them having their own unique set of abilities.[3]

Theme song

Name Artist(s) Length Music Track
"Hi Spec Robo Go!" - Theme of the Hard-Boiled Heavies Tee Lopes, Falk Au Yeong 1:47
Sonic Mania OST - Theme of the Hard-Boiled Heavies



  1. 1.0 1.1 Sonic Mania official website (Japanese). Characters. Sega. Retrieved on 31 May 2017.
  2. Sonic the Hedgehog on Twitter. Twitter (27 June 2014). Retrieved on 10 March 2017. “Say hello to Eggman’s strong arms specialist, Hard Boiled Heavy member Heavy Gunner!”
  3. 3.0 3.1 Sonic SXSW Panel 2017! (Sonic Forces & Sonic Mania!). YouTube. Tails' Channel (16 March 2017). Retrieved on 17 March 2017.
  4. Servebot42 on Twitter (22 July 2017). Retrieved on 23 July 2017.
  5. Game Informer. Game Informer (10 March 2017). Retrieved on 10 March 2017. “Manon Hume: These new foes are customized versions of the notorious Eggrobos from Sonic 3 & Knuckles, and they serve as the bosses for each act.”