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Sonic News Network
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Navigate the flooded floor and mines that respond to Eggman's giant trombone.

— Factoid, Sonic the Hedgehog Encyclo-speed-ia

Brass Eggman[1] is an object that appears in the Sonic the Hedgehog series. It is a modification of Robotnik's Mobile created by Dr. Robotnik, who used it during the West Side Island incident.



As its name implies, Brass Eggman consists of Robotnik's Mobile meshed with parts of a golden-colored brass instrument; the mobile bears a tuning slide protruding on its front, two piston valve-like thrusters on the side and a bell attached on its top. The mobile itself also has an engine exhaust at the bottom.

Features and abilities

Brass Eggman is capable of flight. It is able to emit sound waves, which are capable of causing small cavern rocks of the Hidden Palace Zone as well as red spiked balls. These sound waves can be amplified even further to allow larger red balls to drop.


Brass Eggman appears to be vulnerable against huge amounts of water pressure inflicted on the mobile, causing it to drop from its flight although it can quickly recover from this.


Sonic the Hedgehog 2

In a possible scenario in the 2013 remaster of Sonic the Hedgehog 2, Brass Eggman was used by Dr. Robotnik to fight Sonic and Tails in Hidden Palace Zone. However, Brass Eggman was destroyed by the duo, forcing Robotnik to flee.


Brass Eggman is the boss of Hidden Palace Zone in the 2013 remaster of Sonic the Hedgehog 2, and one of the two sixth bosses overall in both games. It is fought with Sonic, Tails or Knuckles.

Boss fight

Brass Eggman flies in front of a giant archaic organ. He will hover just out of normal jump height and will follow the player's movements (elevating slightly if they attempt to jump at him). The massive bell on his Egg Mobile will activate every few seconds. He begins with four descending notes, causing four hazardous spiked balls to fall from the ceiling and land in the water at random points below the arena (they will never land on the far right side of the room, however). The water will then rise over the platform, taking the floating balls with them for a second or two. After being lowered to the original water level, the balls will detonate and emit a vertical splash that must be avoided. After a few more seconds, a long and loud bellow will emit from Robotnik's bell, causing the screen to shake until one larger spike ball descends. This variant homes on the player's character until it also explodes, thrusting a large jet stream into the air. After this, Dr. Robotnik will encore indefinitely.

Per usual, eight hits will mute the machine. During the first phase of attack, the player can take advantage of the buoyancy of the water to reach the Egg Mobile, although the small flame exhausted at the bottom of the Egg Mobile will damage the player, unlike other bosses from this game. The main method of attack comes in the second phase, where the player can lure the Egg Mobile above the large homing bomb as it erupts. If hit by the plume of water, the Egg Mobile's engines will cut briefly and Robotnik will fall, giving the player enough time to land multiple hits before Robotnik returns to the air and repeats the process.

Brass Eggman takes eight hits to defeat, after which the player can open up the Capsule and finish the Zone.


  • The musical construct seen in the background of this boss fight appears to be based on the famous organ of Alexandra Palace.
  • There is a glitch with inflicting the final hit while the Egg Mobile shakes just after being paralyzed, causing the damage counter to roll over and become indestructible, much like the Egg Crusher boss fight from the original Sonic the Hedgehog.
  • This is the only boss in the 2013 remaster of Sonic the Hedgehog 2 not to be battled in Boss Attack Zone.


Name Artist(s) Length Music track
"STH2 Boss 〜Mega Drive version〜" Masato Nakamura 2:14


  • Brass Eggman appears to be an entirely new vehicle design created by Christian Whitehead, as no concepts for a boss machine were finalized or even intended for Hidden Palace Zone for the original release of Sonic the Hedgehog 2 as mentioned by Craig Stitt, the level designer for Hidden Palace Zone.[2]




  1. Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. ISBN 978-1506719276. "Cut Content: A whole new boss - Brass Eggman - was added to the restored Hidden Palace Zone."
  2. Interview with Craig Stitt, the mind behind Sonic 2's Hidden Palac (3 June 2014). Retrieved on 24 September 2017. "Craig Stitt: The [Hidden Palace Zone] background I really can't say what did and did not change, except the addition of the 'Boss/Organ room' at the end. As I said, that was not on the map given me, so I never created any art for it. And 'why and organ' I have no idea. They may have moved a few things around (but I don't know), but as I said, the only thing I KNOW is new (as far as the background) is the Boss Room."

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