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In the first cutscene of Sonic's story, Eggman is seen standing on top of building with a guard rail in front of him. This guard rail was removed, and the roof texture was changed in the DX version of the game.
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In the Dreamcast version of Sonic Adventure, you can explore under the deep water in the Egg Carrier Chao Garden. Under the water lies a secret ring far out of reach. This was removed in the DX update, because the depth of the water was reduced, probably to prevent Chao from swimming out of reach and getting stuck in the terrain.
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