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Unlike in Sonic Adventure, it does not matter what speed Sonic enters Perfect Chaos' body with.
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In the first and third phases, Sonic must boost into Perfect Chaos to move up his watery body to attack his core.
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Sonic must travel through the flooded ruins of Station Square towards Perfect Chaos in both 2-D and 3-D perspectives whilst avoiding Perfect Chaos' attacks, which include energy missiles, giant whirlpools and water tentacles. In this boss battle, there are several Star Posts that allow the player to return to specific points of the battle should they die.įor the most part, the battle is a reprise from the final battle of Sonic Adventure. However, without access to all seven Chaos Emeralds, Sonic must Boost to avoid falling into the water and to inflict damage on Chaos. The battle with Perfect Chaos is mostly similar to the original battle in Sonic Adventure.