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Sonic News Network
Sonic News Network

Super Mecha Sonic[1] is a transformation that appears in the Sonic the Hedgehog series. It is the Super State of Mecha Sonic, achived by harnessing the power of the Master Emerald. Mecha Sonic assumed this form in attempt to defeat Knuckles the Echidna during an attempt to steal the Master Emerald, only to be defeated for good.


Super Mecha Sonic has an identical appearance to its base form with the only difference that its usual blue color now pulses into a golden-orange color.


Sonic the Hedgehog 3 & Knuckles

In Sonic & Knuckles and the lock-on game, Sonic the Hedgehog 3 & Knuckles, Mecha Sonic transformed into Super Mecha Sonic using the Master Emerald while fighting Knuckles in Sky Sanctuary Zone. However, it was eventually defeated when Knuckles exploited its vulnerability during its recharge phases. After the fight, Super Mecha Sonic returned to its original form and shut down, leaving it to fall down with the collapsing ruins of the Sky Sanctuary Zone.

Powers and abilities

As Super Mecha Sonic, Mecha Sonic's innate abilities are greatly increased. It can fly thanks to the reinforced jet engine on its back, and it can also hover in mid-air without it. In addition, it is invulnerable to all manners of harm.

Mecha Sonic's core offensive move is a Spin Attack-derived technique where it curls into a concussive ball or cutting disk and directs itself at its targets. Additionally, Mecha Sonic can channel energies that can be fired in the form of a round energy blast, and is able to form Rings around itself that deal damage to enemies.


Super Mecha Sonic is unable to sustain its Super State for very long, causing it to revert back to normal rather quickly. As such, it requires the Master Emerald's power to regularly recharge itself and power back up again.


Super Mecha Sonic is the second and final boss of Sky Sanctuary Zone when playing as Knuckles. It is the tenth and final overall boss of Sonic & Knuckles, and the twenty-second and final boss of Sonic the Hedgehog 3 & Knuckles in Knuckles' stories of said games. The battle is encountered directly after the previous Mecha Sonic battle is completed.

While it can only be fought by Knuckles under normal circumstances in both games, it can also be fought by Sonic or Tails (together or individually) in Sonic the Hedgehog 3 & Knuckles if Level Select and Debug Mode are both enabled.

Boss guide

Like the previous Mecha Sonic battle, the battle still takes place on a flat stage with Angel Island appearing in the background. The battle commences with Mecha Sonic assuming its Super State just as the player's character appears on-screen. The player is unable to harm Mecha Sonic while it is in its Super State.

Mecha Sonic can use any of the following attacks:

  • Spinning into the player character's current position
  • Ramming into the player character's current position at full speed
  • Firing three charged balls of energy at the player's position.

After using the energy ball attack, Mecha Sonic will power down and drop down before spinning into the Master Emerald in order to recharge. The player is presented with two opportunities to attack Mecha Sonic; the first being when Mecha Sonic drops down before spinning and the second being Mecha Sonic jumping onto the Master Emerald. The player cannot damage Mecha Sonic while it is drawing power from the Master Emerald and touching Mecha Sonic while this is occurring will damage the player.

Between each attack, Super Mecha Sonic will constantly hover at the top of the screen while moving horizontally. Halfway through the battle when Mecha Sonic receives enough hits however, the attack pattern completely changes; Mecha Sonic hovers at the top of the screen while slowly following the player's character, stopping to either fire a series of thick damaging rings in different trajectories, or drop down while powering off for a few seconds, giving the player a small window of opportunity to hit Mecha Sonic before it powers up again.

The player must land a total of eight hits on Mecha Sonic to defeat it. If Knuckles has collected all of the Chaos Emeralds, then Super Mecha Sonic is completely destroyed at the end of the boss battle. However, if the Emeralds have not all been collected, Mecha Sonic reappears at the end of the credits, sparking with glowing red eyes while standing on top of the Master Emerald.


Name Artist(s) Version Length Music track
"The Doomsday Zone" Sega Sonic & Knuckles/Sonic the Hedgehog 3 & Knuckles 2:01
Sonic & Knuckles Collection "FM Synthesizer" 1:54
"General MIDI" 1:51

In other media

Books and comics

IDW Publishing

In the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing, Super Mecha Sonic is a transformation Mecha Sonic can attain using the Master Emerald.


  • Mecha Sonic is the first villain to manage to achieve a Super State, the first inorganic character to ever use a Super State, and the first character to trigger a transformation by use of the Master Emerald (the next would be Imperator Ix, over a decade later). Classic Metal Sonic would also attempt to trigger a transformation via the Master Emerald in Sonic Mania Adventures, although Knuckles knocked him away before he could succeed.
  • Because this boss was only ever intended to be fought by Knuckles, if the player enables Debug Mode and uses Sonic to fight him, the ending cutscene will have a glitch where a blue Knuckles will appear riding on the Tornado. However in Sonic the Hedgehog 3 & Knuckles, if the last accessed save file had all seven Super Emeralds collected before playing the act as Sonic, the ending cutscene will play out as normal.
    • If the player finishes this fight as Tails via Debug Mode, the same glitch occurs in the ending cutscene though Tails' tails will also be present throughout most of the cutscene.


  1. Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 55. ISBN 978-1506719276. "Once defeated, his battered form falls away with the crumbling ruins, only to return in Knuckles' scenario. Knuckles' battle goes very differently. After a one-on-one brawl, Mecha Sonic retreats to the stolen Master Emerald, and tries to absorb its power. From there, Knuckles must endure Super Mecha Sonic's assault until its power wanes, then strike during the brief moment of weakness."

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