These are cheat codes for Sonic Adventure which can be accessed by inputting button sequences or by various other methods.
- Infinite Health: Place a Chao in the VMU and change its name to 1234567.
- Chao puzzle: Have three controllers plugged in and the third one should have a memory card in it. In adventure mode press Start on the third controller. The 15 level Chao Puzzle minigame will be playable on the VMU on the third controller.
- Clean Pause (any mode): Pause the game and hold + to clear the game of the pause screen.
- Play Emerald Course in chao race: Beat the rest of the four courses. Don't delete your your chao data or else you will have to do them again.
- 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.
- 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 one behind 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.
Game Enhancer Codes
These are cheat codes that can only be used with game enhancer devices.
||Debug Menu 1.0.
||Debug Menu 1.1.