|First Appearance||Sonic R|
Metal Knuckles is a metal version of Knuckles The Echidna designed by Dr. Robotnik in a similar vein to Metal Sonic. The character appears only as an unlockable playable character in Sonic R. To unlock Metal Knuckles 5 tokens must be collected in the Reactive Factory which will activate a race against Metal Knuckles, winning this race unlocks the character.
As Metal Knuckles was designed to take on Knuckles, he retains speeds and strength as well as the ability to glide.
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