Phantasy Star Online Costumes: For Sonic, successfully complete all of his missions (not including Cannon's Core).

Green Hill: To unlock a 3D version of Green Hill Zone, you must collect all 180 emblems in the game.

Then the Last Side option will be available in Story Mode.

Final Stage: To unlock the Final Stage, Cannon's Core, first beat the Hero and Dark Sides in 1-Player Story Mode.

Play as Tikal in VS Mode: Beat all of Knuckles' levels with an A rank.

Play as Mecha Sonic in VS Mode: Beat all of Shadow's levels with an A rank.

Play as Chaos 0 in VS Mode: Beat all of Rouge's levels with an A rank.

Play as Big in VS Mode: Get A ranks on all of Eggman's Stage.

Play as Amy in VS Mode: Beat all of Sonic's levels with an A rank.

Play as a Chao in VS Mode: Beat all of Tails' levels with an A rank.

Finally, go to Sound Test and select 'Character'. After the Credits, go to Stage Select mode, choose any stage and mission and finish it. Select 1P mode, Last story, and fight the Final Hazard again.

Main Theme in Sound Test:Complete all three stories (Hero, Dark and Last).

Sonic will get a board under his shoes and will be able to street board the level with it! However, you can't complete the stage with this board. In Sonic's second stage (Metal Harbor), press in the second controller at any time. Have board in Metal Harbor: First, have two controllers plugged in.These are cheat codes which can be accessed by inputting button sequences or by various other methods.

Sonic adventure 2 chao guide xbox 360