Hyper Knuckles

Hyper Knuckles is a form similar to Super Knuckles in that it makes Knuckles faster, invincible, requires fifty rings and makes Knuckles 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 and Knuckles which are obtained by entering a Giant Ring with all seven 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 and Knuckles alone.

Knuckles glows the pink in this state; if he should touch a wall while gliding, it creates a wave that destroys all on screen badniks.

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

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

Characters in the Sonic the Hedgehog game series
Recurring characters Heroes Sonic (Super, Starfall, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy (Super, Hyper) | Mighty (Super) | Ray (Super) | Espio | Charmy | Vector | Cream | Big | Blaze (Burning) | Silver (Super) | Sticks Anti-heroes/Neutrals Shadow (Hero, Dark, Super) | Rouge | E-102 Gamma | E-123 Omega | Jet | Wave | Storm Villains Dr. Eggman | Metal Sonic (Rocket, Neo, 3.0) | Mecha Sonic (8-bit, Mk. II, Mk. III, Super) | Fang | Tails Doll | Metal Knuckles | Chaos (Perfect) | E-Series | ZERO | Biolizard (Finalhazard) | Black Doom (Devil Doom) | Eggman Nega | Orbot | Cubot | Deadly Six (Zavok, Zazz, Zomom, Master Zik, Zeena, Zor) Teams Sonic/Heroes | Rose | Dark | Chaotix | Babylon Other Animals (Flicky) | Froggy | Chao (Hero, Dark) | Tikal | Pachacamac | Omochao | Chaclon | Gerald & Maria Robotnik | President | King Boom Boo | Cheese | Chocola | Vanilla | G.U.N. Commander | Wisps | Mother Wisp
One-off characters Heroes Emerl | Marine | Lumina Flowlight | Chip | Shahra | Knights of the Round Table | Caliburn | Yacker | Avatar | Barry | Trip (Super) Anti-heroes/Neutrals Bean | Bark | Shade | Merlina | Sage Villains Witchcart | Hocke-Wulf | Bearenger | Carrotia | Battle Kukku Army (15th, 16th, Dr. Fukurokov) | E-101 Beta | Void | Chaos Gamma | Gemerl | Shugo-hei | Iblis | Mephiles | Solaris | Erazor Djinn | Captain Whisker | Johnny | Master Core: ABIS | Ix (Super) | Dark Gaia | King Arthur | Hard Boiled Heavies | Infinite | The End | Mirage Express Teams Vector | Eggman Other Birdie | Illumina | Secretary | Elise | Duke of Soleanna | Sonic Man | Coconut Crew | Vikings | Professor Pickle | Wentos | Don Fachio | Dodon Pa | Koco | Ancients | Conductor | Conductor's wife | Ariem | Heavy | Bomb | Tiara Boobowski | Honey