In order to unlock the Kart game, in the Hero Side story, complete Tails
driving quest and in Dark Side story, successfully finish Rouge chase
mission.
To unlock Boss Attack mode, complete either Hero or Dark side story
modes. You'll be able to fight each boss from either Hero or Dark side.
Unlock Dark Garden:
To unlock the Chao Dark Garden, you must raise a Dark Chao with one of
the three Dark characters. Continually feed and train your Dark Chao
and it should evolve (creates a tear-shaped "cocoon"). Once it evolves,
descending stairs should appear at the main Chao lobby leading to the
Dark Garden.
Unlock Hero Garden:
To unlock the Chao Hero Garden, you must raise a Hero Chao with one of
the three Hero characters. Continually feed and train your Hero Chao
and it should evolve (creates a tear-shaped "cocoon"). Once it evolves,
ascending stairs should appear at the main Chao lobby leading to the
Hero Garden.
Everybody
wants to play as Super Sonic, and now you can. All you need to do is
complete "Last Stage?" in story mode, and you'll unlock both Super
Sonic and Hyper Shadow.
To
find the hidden artwork on the Sonic Adventure 2 disc, pop it into your
PC's CD-ROM drive. Look at the CD's directory to find a number of
wallpapers, including an endearing picture of a Chao.
Unlock Green Hill Stage:
To
unlock a 3D version of the classic Green Hill stage (from Sonic the
Hedgehog on Genesis), earn all 180 emblems. The new stage will appear
on the world map.
