When Tails deciphers the pictograms in the Siberian temple, he explains that the Master Emerald is forged from the seven Chaos Emeralds, which no-one in-Universe had heard about until then. When the Master Emerald breaks apart after Knuckles punches it out of Robotnik, the Chaos Emeralds are revealed, which Sonic unintentionally uses to transform into Super Sonic.

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