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Chaos 0 (boss)

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Chaos 0 is the first boss in Sonic Adventure and Sonic Adventure DX: Director's Cut. It is fought outside of the City Hall in Station Square when the game begins.


The player controls Sonic/Metal Sonic during the boss battle. To defeat Chaos, all the player has to do is jump onto its brain to deal out damage. The player must dodge Chaos' attacks, while are mainly extending or spinning its arms in an attempt to hit the player. After each hit, Chaos will turn into a puddle and move to a different location in the battlefield. 

After two hits to the brain, Chaos will jump onto many street lights surrounding the player and attempt to hit the player by extending its arms. After dodging these hits, it will eventually jump back to the surface, leaving him vulnerable for an attack. Once the player hits Chaos for the third time, it is defeated and the battle has been won. 


Sonic Adventure Fight Against Chaos-004:03

Sonic Adventure Fight Against Chaos-0


  • Sonic is the only one who fought Chaos 0 in Sonic Adventure.
  • Despite appearing before Emerald Coast, this boss cannot be fought in the demo version on the Xbox 360.
  • Sonic Adventure DX 2016-09-15 22-45-06-205

    The falling animation of Chaos.

    If the player fight this boss again after gaining the Ancient Light, it is possible to use the Light Speed Attack on Chaos while it is on the pole and finish it there. This can trigger an unused animation of Chaos where it will fall from the pole until it puddles on the ground.
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