Although it uses the same body model as Metal Sonic, the only thing different about the two are the colors.
Metal Sonic 3.0 is colored black where Metal Sonic is colored blue, it also has black feet with a yellow stripe as opposed to Metal Sonic's Red with white stripe. 3.0 also has a yellow outline around its eyes and three parallel vertical yellow stripes starting from its muzzle to the top of 3.0's spine.
Interestingly, the outside of 3.0's ears are colored a silver gray, as opposed to black.
It was made to awaken the Ifrit and raced Shadow, Metal Sonic, Silver or Espio (depending on the story mode).
When either one reaches the Ifrit, Metal Sonic 3.0 tries to stop them from destroying the Ifrit and attacks them.
Once the Ifrit is defeated, Metal Sonic 3.0 was either destroyed or trapped in the Ifrit's dimension. It is unknown whether or not 3.0 is a copy of Metal Sonic or Metal Sonic from the future.
- A Metal Sonic 3.0 action figure was proposed by Jazwares as a simple repaint of the already existing 3.75 inch Metal Sonic toy, similar to the Silver Sonic proposal. This idea was rejected by SEGA.
- Despite being another inspiration from the image and DNA of the original Sonic, the two never actually fought or met, making this one of the only Metal Sonics that was never faced by Sonic.
- Metal Sonic 3.0's colors, black with yellow stripes, are the same as Gemerl, Shadow Android (in multiplayer), and Eggman Nega's jacket, all three of whom are doppelgangers of other characters.
- Metal Sonic 3.0's colors are actually just Metal Sonic's "Leather" costume from the first Sonic Rivals, with a painted head.
- The original "Leather" costume can even be used for Metal Sonic in Sonic Rivals 2, under the name of 2.0, by winning his trophy in Multiplayer.
- Despite supposedly being an updated version of Metal Sonic, he seems to be just as strong as him.
- In Sonic Rivals 2, Metal Sonic 3.0's name and picture are displayed the same as Metal Sonic's, since he is just a palette swap of Metal Sonic.
- A Mach outfit for Metal Sonic in Sonic Rivals 2 can be obtained to make him look like Metal Sonic 3.0 by successfully copying every other rival's signature move.
- In both Sonic the Hedgehog and Sonic Universe comics, the original Metal Sonic, Shard, was rebuilt and given a new paint job that greatly resembles that of Metal Sonic 3.0.