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Ah, unlocking the Perfect Chaos battle in Sonic Adventure DX is like painting a happy little tree. To access this epic showdown, you'll need to first complete Sonic's story mode. Once you've done that, you'll be able to face off against Perfect Chaos in the final battle and experience the excitement and joy of saving the day in the game. Just remember, there are no mistakes, only happy accidents in gaming!
Burp in your moms face
When cadence is asking you what difficulty you want to play on, click on her face to unlock expert mode.
after you beat that subspace emissionary you'll unlock boss battle.beat it with fox and you'll face him.he his very fast and strong. GOOD LUCK!!!!!
2-player mode is in a special area called the Sonic Simulator. It has a metal Sonic face when you choose it.