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Knuckles the Echidna is a character from the Sonic universe. He was a stage cameo in the Green Hill Zone stage in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS, and he is an Assist Trophy in Super Smash Bros. Ultimate.
Knuckles appears as an assist trophy. When summoned, he attacks characters with a Homing Attack, similar to Sonic's Neutral Special. He can also dig into the ground, attack opponents with an uppercut, or he simply punches opponents with his fists.