Hyper Knuckles

Hyper Knuckles (ハイパーナックルズ) is Knuckles the Echidna's super transformation that is gained when he taps into the power of seven Super Emeralds and 50 power rings or the Master Emerald. His only game appearance was in Sonic 3 & Knuckles, but he has made a couple of appearances in the Archie Comics fighting several enemies like Super Sonic, Robotnik, and Mammoth Mogul. However, it should be noted that in the Archie Comics, Hyper Knuckles is the given name of Knuckles's Chaos Emerald powered Super State.

Appearance
Like Super Knuckles, Knuckles does not receive any physical transformation, but his fur pulses from red to pink. Unlike his Super form, however, any movement he makes, leaves after-images.

Powers and abilities
While in Hyper form, Knuckles's natural abilities are multiplied many times over: His already impressive strength, speed and accuracy increase vastly, and he is virtually invulnerable as long as the transformation lasts. Since Hyper Knuckles is an enhanced version of Super Knuckles, all of his physical abilities surpass that of Super Knuckles and he gains additional abilities as well. When gliding into a wall, Hyper Knuckles can cause an earthquake that destroys all enemies on the screen and he can breathe underwater as well. In the comics, Knuckles's natural bond with the Chaos Force is also more open to him while in this state, granting him abilities he would not otherwise be able to control.

Like most other super transformations, caused by the Chaos Emeralds/Super Emeralds, once he runs out of rings, he returns to his normal form.

Archie Comics
In the Sonic the Hedgehog series from Archie Comics, Knuckles first achieved his Hyper form when a confrontation with Sonic the Hedgehog pulled them both into another Zone from that of Mobius Prime. Having collected seven Chaos Emeralds and fifty Power Rings each, both fighters transformed into their advanced forms. After a brief battle, the two were expelled from the Zone and powered down, though Knuckles got a backup Chaos Emerald for Angel Island out of the struggle. (SvK)

Some time later, he would use this form in a battle with Master Mogul alongside Super Sonic and Turbo Tails, using Mogul's Emeralds and Power Rings provided by the Ancient Walkers to power up. In the resulting battle, Mogul became imprisoned in the recently created Master Emerald. (StH: #56)

A year later, after losing his Chaos powers due to returning from the afterlife, Knuckles would use the Master Emerald to take this form again without the aid of Chaos Emeralds, this time calling it Super Knuckles, as he did battle with the villainous Hunter, eventually throwing him off Angel Island and killing him. (StH: #125, #141)