

The characters have new levels only for those characters in the game (unlike Sonic Adventure).

Eggman, Tails, Knuckles, and Rouge the Bat. There are no hub worlds in Sonic Adventure 2, a level select map is what replaced it. But Tails can no longer be playable without the Tornado (outside of the Chao Garden). It is very similar to Sonic Adventure DX. The original Ultimate Life Form, Biolizard, wakes up and then transforms into FinalHazard, and Sonic and Shadow have to turn Super to defeat FinalHazard. They then find out Professor Gerald Robotnik's plan to ram the A.R.K. Tails and Eggman soon fight each other, after Eggman "killed" Sonic. Sonic soon gets blasted into space, but uses Chaos Control to get back to the A.R.K. sonic and his friends set out to get different things done. Sonic, Tails, and Knuckles set out to beat Dr. The doctor, Shadow, and soon afterwards, Rouge set out to go to the Space Colony A.R.K. When he finds the project he finds Shadow who is the result of that project. In that military base he is trying to find a project called the "Ultimate Life Form". The game opens up with Eggman attacking one of G.U.N.'s military bases.
