Knuckles (or "Knux", for friends) is a fictional character in the SonicTheHedgehog universe. He's the guardian of the Master Emerald, a very powerful jewel. In one of the videogames, he was fooled by EggMan, who made him believe SonicTheHedgehog and MilesTailsPrower were going to steal the Emerald.
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*http://info.sonicretro.org/Knuckles - his page in the Sonic Retro wiki.

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WalledGarden