Place a Chao in the VMU and change its name to the following:
Password Effect 1234567 Infinite Health
Contributed By: DagothUrReturns.
Play Emerald Course in chao race
Beat the rest of the four courses. Note: Don't delete your your chao data or else you will have to do them again.
Contributed By: Tanno.
Unlockable How to Unlock Amy Talk to her in the Casino as Sonic after finishing Sky Chase. Big Defeat Chaos 6 as Sonic. E-102 Gamma Defeat Gamma after finishing Sky Deck as Sonic or Tails. An alternate way to unlock him is to finish Twinkle Park as Amy and watch the FMAs after it. Knuckles Defeat him after finishing Ice cap as Sonic or Tails. Miles Tails Prower Finish the C mission of Emerald Coast action stage as Sonic. Super Sonic Finish the game as Sonic, Tails, Knuckles, Amy, Big and E-102 Gamma. Super Sonic will be avaliable only in Adventure Mode.
Contributed By: Ryusuke Sakazaki.
Unlockable How to Unlock Super Sonic Complete the game with every character
Contributed By: JPeeples.
Unlockable How to Unlock Ancient Light (Sonic) On top of a rock on Angel Island Booster (E-102) In the Weapon's Armory on the Egg Carrier Crystal Ring (Sonic) Walk up the steps in the hotel, press the two buttons and use light speed dash Fighting Gloves (Knuckles) On a ledge over Big's house Jet Anklet (Tails) In a hole in the ceiling in the sewer behind Twinkle Park Laser Blaster (E-102) In the Restricted room on the Egg Carrier after it crashes Life Belt (Big) In the entrance to Icecap Light Speed Shoes (Sonic) Find it in the sewer (not the onebehind Twinkle Park) Long Hammer (Amy) Beat your own high score on Hedgehog Hammer after the Egg Carrier crashes Long Rod (Big) Under the bed at Big's hut Lure Upgrade 1 (Big) In the sewer behind Twinkle Park Lure Upgrade 2 (Big) Under an sheet of ice in IceCap Lure Upgrade 3 (Big) In a cave in the forest Lure Upgrade 4 (Big) In one of the jail cells on the Egg Carrier Rhythm Badge (Tails) In the flashback with Tikal Shovel Claw (Knuckles) In the tunnel inside the tunnel where you find the cart to the Mystic Ruins Chao Garden Warrior Feather (Amy) Beat Eggman's high-score on Hedgehog Hammer
Contributed By: Chaos_Control7.
Press X immediately before entering the snowboarding portion of the game to get a blue snowboard or B for a yellow snowboard.
Contributed By: freakunique.
Experience a short NiGHTS homage.
While playing with Sonic in Casinopolis, go to the pinball game with the NiGHTS motif. Hit the three little purple point givers in order to open up an entrance at the top of the board. Then make your way through the secret entrance. You'll now be in another NiGHTS motif pinball game. Whenever you fail to catch Sonic with the bumpers, don't worry about losing a ball. Instead, Sonic will be transported through a world very familiar to the NiGHTS level Splash Garden. You can even see NiGHT and pians!
Contributed By: Felix Arabia.
You must have 3 controllers and the 3rd one must have a memory card for this to work. Start up the game with all 3 controllers plugged in and get into Adventure mode as any character. Now press START on the 3rd controller. Something on the memory card's screen will come up saying "CHAO PUZZLE". Press START again to begin. It is a 3x3 slider puzzle with a random animated Chao doing something for a picture. Use the D-Pad to select the piece you want to move and press A to move it into the open area. You can also move two pieces at once. Press B for a different puzzle. Press START again to quit. There are 15 levels and every 5 you complete there is a congratulatory message from a Chao. After you beat the 15th it will start you at level 1 again.
Contributed By: GameFreakMania.
Clean Pause (any mode)
Pause the game and hold X + Y to clear the game of the pause screen.
Contributed By: NTsui.
Hidden Sonic Adventure Art
You can find some cool hidden Sonic Adventure arts made by SonicTeam themselves by putting the GD-ROM inside the computer's CD-ROM drive. Access the folder inside it and view the .bmp pictures there!
Contributed By: CChan.
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