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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 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.

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.

Unlock Last Stage
In order to play the actual last stage of Sonic Adventure 2, finish both Hero
and Dark side story games. Once done, go into story mode and a "Last
Stage?" menu selection should appear between Hero and Dark selections.

Unlock Super Sonic and Hyper Shadow
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. Summited by hypersonic.
To get new costumes in Multiplayer just complete every mission with any
character and access Multiplayer and you will notice an arrow next to the
character with the completed missions and press left or right and press A.

Boss Attack Mode:
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 Kart Racing:
game 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.

Hidden Artwork:
Put the game disc in a PC CD-ROM drive to find additional art images from
the game.

Make Omochao Angry:
Just pick him up and throw him around. If you throw him at a bad guy, he'll
blow up. You can even shoot him with Eggman or Tails while he's flying
around your head.


Big the Cat Appearances
There are several places in SA2 that you can see Big the Cat from Sonic
Adventure. Here are a few of them: 1. City Escape: About 3/4 of the way down when you're running away from
the truck look on the right sidewalk to see him running away. 2. Radical Highway: After going in one of the rockets look at the blimp to the
left and he will be sitting on it. 3. Pumpkin Hill: Go to the area where the train is stuck (it's going back and
forth) and he is behind one of the gates waving to you. 4. Cannon's Core: With Rouge, go to the top of the highest pillar in the main
room and look up. He's jumping up and down. 5. When you're battling against Shadow with Sonic in the Green Forest area
there is a grate. Look down in the grate and you can see Big fishing.