Thus far, Hyper Sonic's only appearance is in Sonic the Hedgehog 3 & Knuckles. In the game, Hyper Sonic looks very similar to Super Sonic, sharing the same body proportions and upturned head spikes. However, Hyper Sonic flashes in all seven colors of the Chaos/Super Emeralds and has large flashing sparks (similar to the Invincibility item) floating around him. Also, when moving, he leaves several after-images.
Powers and abilities
Hyper Sonic has unlimited speed. His strength is unknown and incalculable. He also has all of Super Sonic's abilities, such as invincibility to all attacks, improved speed and strength, and greater jumping abilities. Since Hyper Sonic is generally an upgraded version of Super Sonic, it can be assumed that all of Hyper Sonic's physical abilities surpass that of Super Sonic's. Hyper Sonic also has some new and improved abilities: while Super Sonic is near invulnerable, Hyper Sonic is completely invulnerable towards physical harm from attacks and the environment, however, he can still die by being crushed, falling into a pit, or running out of time. He also can breathe underwater and has the added ability of a devastating lightning attack. This can be used to launch him in any direction and, when performed, destroys all enemies on-screen (except bosses) with a bright flash.
As with all Chaos Emerald/Super Emerald-caused transformations, once Hyper Sonic runs out of Rings, his transformation will end and will revert back to normal.
Hyper Sonic's name comes from the term hypersonic, which is a speed above supersonic (which is defined as any speed Mach 5 or greater than it).
Hyper Sonic's new ability can somehow force him to enter a Bonus Stage without jumping into the ring of stars.
A similar problem can occur when in Carnival Night Zone whenever a Bumper is on screen. If it's on screen and Hyper Sonic isn't near it and performs Hyper Flash, instead of dashing to the direction the player inputted, he will instead act like he hit a bumper.
Due to palette sharing, when Sonic is Hyper Sonic, certain objects glow multiple colors like him, such as Flickies, and some Monitors. This also includes the small picture of Sonic in the bottom left hand corner.
In Launch Base Zone Act 2, if Sonic transforms into either Super or Hyper Sonic underwater, then he will have a color scheme similar to Shadow the Hedgehog's for one of the frames of his transformation.
Like Tails and Knuckles, if the player turns into Hyper Sonic with S in Debug Mode when the level ends, and quickly turn back into a box, the name "Sonic" in "Sonic Got Through Act 1/2" turns into Hyper Sonic's colors.
Like Super Sonic, Hyper Sonic is not completely animated.
In the files of Sonic Mania concerning Special Stages, the word "Hyper" can be found. This could mean Hyper versions of characters were planned but were scrapped ideas in later development.