Cheat Codes:Sonic Adventure 2: Battle

Cheat Codes

These are cheat codes which can be accessed by inputting button sequences or by various other methods.

Green Hill Zone: Get all 180 Emblems and unlock the 3D version of Green Hill Zone from Sonic The Hedgehog 1.
Hidden Secretary Theme: When you are on the Theme Select screen, rotate the Control Stick Clockwise for a while until you hear a chime-like sound. You should be able to select the Secretary Theme.
Last Stage: In order to play the actual last and final stage of this game, then finish both Hero and Dark side story games. Once this is done, go into story mode and a Last Stage? menu selection should appear between the Hero and the Dark Side selections.
More Karts: Complete every mission for each story character (ranking does not matter) and you'll unlock the new kart for them. Simply highlight their picture on the select screen and press Up.
Scene Select.: Beat the story mode.
Alternate Costumes: Complete every mission for each story character with an "A" rank, and you'll unlock the new costume for them. Simply highlight their picture on the select screen and press Up.

2P Kart Race: Simply complete both Route 101 (Hero) and Route 280 (Dark) and Kart Race in 2P Battle with become available.
Dark Boss Attack: Beat the game with the Dark Side to unlock Boss Attack in 1P Play. Boss Attack is basically a Time Attack to see how quickly you can beat all bosses on the Dark Side.
Hero Boss Attack: Beat the game with the Hero Side to unlock Boss Attack in 1P Play.
All Boss Attack: Beat all three main stories to unlock Boss Attack in 1P Play. This mode combines the Hero, Dark, and Last bosses.
Level 4 2-player games: Beat Final Rush or Final Chase in the Hero or dark side and a level 4 game should appear in 2-player mode.
Kart Racing Game: In the Hero Side story complete the Tails driving quest and then in Dark Side story successfully finish the Rouge chase mission. You will now have a playable kart racing game to play.

Hero Chao Garden: 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.
Dark Chao Garden: Raise a Dark Chao with one of the three Dark characters. Continually feed and train your Dark Chao and soon it will evolve (creates a tear-shaped cocoon). Once it evolves, the descending stairs should appear at the main Chao lobby.
Diamond & Onyx Chao Races: Win at least one race from Aquamarine, Garnet, Peridot, and Topaz Chao Races to unlock them.
Jewel races: Complete all 4 of the original races and get the emblem. The Jewel races will be unlocked.
Super Level on Chao Karate: Complete all three of the original difficulties in Chao Karate using the same Chao and that Chao (and that Chao only) will now have access to a Super level.