The Doomsday Zone (Beta) - Sonic the Hedgehog 3 & Knuckles Music Extended - YouTube
Doomsday Zone - YouTube
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Bosses - Sonic Generations Wiki Guide - IGN
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Sonic & Knuckles/Beta elements | Sonic News Network | Fandom
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Doomsday Zone - Sonic 3 HD (Extended) - YouTube
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Game Jolt - Share your creations
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Zone: 0 > Sonic & Knuckles > Stages and Story
