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From Sonic Retro

Hyper Sonic as seen in Sonic 3 & Knuckles ending

However, in addition to requiring the seven Chaos Emeralds it requires the seven Super Emeralds from Sonic 3 & Knuckles which are obtained by entering a large ring with all seven Chaos Emeralds. Sonic is then warped to the Hidden Palace, where he is required to complete one of the Special Stages, which are the same Special Stages that you would get the regular Chaos Emeralds from in Sonic & Knuckles alone. Sonic glows the colors of the Chaos Emeralds in this state, can perform a "double jump" of sorts that can be aimed, and destroys any Badniks on screen. He also cannot drown.

This character was only available in Sonic 3 & Knuckles and has not been in any game since. In the Archie comics, Sonic has a form called "Ultra Sonic"; since this is a common misnomer for Hyper Sonic, and since it appears at the same time as Hyper Tails, it may have been based on Hyper Sonic.