Sonic Adventure 2: Battle Unlockables

Finish either side story to see all the scenes from the side of the story that you chose or you can play the Bosses that you fought in a time attack mode. To get both the Hero and the Dark modes you have to finish both sides of the game.

Finish both Hero and Dark side story modes. Begin the story mode to access the Last Stage option.

To get an extra Island level, you must get all the Emblems, including Kart, Timed Boss, and the emblems for all A rating. Once you have them all, which should total 180, the island next to the Green Forest level will have the face of Sonic on it. The new level is a 3D version of the Green Hills Zone, from Sonic The Hedgehog. This level has no missions, is very simple, and has many varying routes.

Get A ranks on every mission with the character you wish to get the costume for.

You either have to Finish Hard mode, or all three original modes (Beginner, Intermediate, and Hard). Doing this will unlock the fourth difficulty mode, Super. The Super mode is very hard if your Chao is not strong enough.

Finish all of Tails' missions with A ranks.

Finish all Eggman's missions with A ranks.

Finish all of Rouge's missions with A ranks.

Finish all of Shadow's missions with A ranks.

Finish all of Shadow's mission with A ranks.