- Not to be confused with Mecha Knuckles of Sonic Advance.
Metal Knuckles, as seen in Sonic R.
Metal Knuckles appeared in Sonic R as a hidden opponent for Reactive Factory. It can be unlocked by getting the five Sonic Tokens of the course, and finish the race on first, second or third place. Once beaten, Metal Knuckles is added to the selection of playable characters. It is Knuckles' robotic counterpart, as Metal Sonic is the robotic counterpart of Sonic. It has an improved gliding ability, compared to Knuckles, and could rivalize with Super Sonic on a race.
Characters in the Sonic the Hedgehog game series
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Recurring characters
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Heroes
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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
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Anti-heroes/Neutrals
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Shadow (Super) | Rouge | E-102 Gamma | E-123 Omega | Jet | Wave | Storm
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Villains
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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)
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Teams
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Sonic/Heroes | Rose | Dark | Chaotix | Babylon
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Other
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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
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