Chaos 0 (boss)

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

Battle
The player controls 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 it's 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.