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From Sonic Retro

Hyper Knuckles is a super transformation similar to Super Knuckles in that it makes Knuckles the Echidna faster, invincible, requires fifty rings and makes him glow. It also saps away rings at the same rate of one per second.

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 Giant Ring with the Chaos Emeralds. You are then warped to Hidden Palace Zone, where you are 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.

Hyper Knuckles looks exactly like Super Knuckles, but with the addition of after images in place of twinkling stars. If he should touch a wall while gliding fast enough, it creates a wave that destroys all on screen badniks.

This character was only available in Sonic 3 & Knuckles and has not been in any game since.

In the American Sonic the Hedgehog comic, where characters' "Super" forms have different names, Hyper Knuckles is the name of Knuckles' Super State.