Sonic Adventure DX Cheats

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Hidden Emblem:
At the Egg Carrier in Egg Man's bedroom flip down the bed on the wall and there is an emblem.
User Cheat by robinson_shae

Unlock Super Sonic:
After finishing the game using all six starting characters you will unlock Super Sonic. Sonic will transform into Super Sonic after some time into the next game.

Jump over the train in Station Square as Sonic or Tails. You will find him on the other side.

Unlock Metal Sonic:
Collect every one of the 130 Emblems and you will unlock Metal Sonic in trail mode.
User Cheat by rickypastor

Mission mode:
After finishing the game in adventure mode with every character you will unlock the MISSION MODE option in the main menu.
User Cheat by Mickey2002

Unlock Tails:
You can use the second controller for Tails after he is obtained while playing the game in story mode. Shields, invincibility and extra life boxes have no effect on Tails if collected. REMEMBER: If Tails goes too far away from Sonic, he will appear next to Sonic.

Power-up locations:  

Sonic
Light Speed Shoes: Sewer in Station Square.
Crystal Ring: Elevator on second floor of hotel.
Ancient Light: On rock near bridge to Angel Island. 

Tails
Rhythm Badge: Follow Tikal to past (it is on a pyramid)
Jet Anklet:In the sewer behind Twinkle Park. 

Knuckles
Fighting Glove: In the cave near Angel Island.
Shovel Claw: On a cliff behind Big The Cat's house. Go to the Mystic Ruins and go to the ledge where you entered the level. Turn to your right. The Shovel Claw can be found right above Big The Cat's house. They allow Knucles to do an attack similar to Sonic's Homing attack. 

Amy
Warrior Feather: Defeat Hedgehog Hammer for the first time.
Long Hammer: Defeat First Place score again. 

Big The Cat
Life Belt: In the lake in the cave leading to Angel Island.
Power Rod: In Forest under Big's bed.
Lure 1: In Sewer Behind Twinkle Park.
Lure 2: In a cave in the Forest.
Lure 3: In the Icecap level.
Lure 4: In a prison cell on the Egg Carrier. 

E-102 Gamma
Jet Booster: In the Ammunition Room of the Egg Carrier.
Gun Upgrade: In the room opposite the Ammunition Room.

Getting every Emblem:  

Sonic: 30 emblems to collect in Sonic's Action Stages.
Tails: 15 emblems to collect in Tail's Action Stages.
Knuckles: 15 emblems to collect in Knuckles Action Stages.
Amy: 9 emblems to collect in Amy's Action Stages.
Big the Cat: 12 emblems to collect in Big's Action Stages.
E-102 Gamma: 15 emblems to collect in E-102's Action Stages.
Adventure Field: 12 emblems to find in Adventure Field.
Mini Games: 10 emblems to collect in Mini Games.
Chao Races: 5 emblems to collect in Chao Races.
Finish the game with all six characters to get 6 emblems.
This brings the total number of emblems that are collectible in the game to 130.

Ruby-Red chao:
All you need is two natural chaos (adult). One Swimming type and a running type. Let them dance and it make a chao egg, inside is a Ruby-Red chao.
User Cheat by masmorjet

Sonic Chaos: Level select:
Push Up(2), Down(2), Right, Left, Right, Left when "Press Start" appears at the Sonic Chaos title screen.

Sonic Chaos: Instant Chaos Emeralds:
Push Up, Down, Up, Down, B, A, B, A, B, A at the Sonic Chaos character selection screen.

Sonic Chaos: Sound Test:
Push Down(2), Up(2), Left, Right, Left, Right, B, A at the Sonic Chaos title screen.

Sonic Labyrinth: Level select:
Push Up(2), Right(3), Down(6), Left(9) when "Press Start Button" appears at the Sonic Labyrinth title screen.

Sonic Spinball: Level select:
Go into the "Sound Test" option for Sonic Spinball. Now play the following songs in order: 0, 2, 1, 5, 6, 6.

Sonic Triple Trouble: Level select:
Hold Up when the Sega logo becomes visible. Wait until Knuckles touches the red emerald then rapidly push Start.

Misplaced death 2:
Play as Sonic & go to the theater in the casino area. Move into a corner & charge up but not fully for a light dash. Release B and you\'ll fall through the ground & lose a life.
User Cheat by Phonepatch  

Misplaced death:
Play as Knuckles & go to the theater in the casino area. Move into a corner and press B(3). You will fall through the ground & lose a life.
User Cheat by Phonepatch

Emblem Hideouts:
   Here's where you can find extra emblems.
 1. Go to the place where you get the ice key as Tails and fly up.
 2. Go to that hut in the jungle as Tails and fly into the log.
 3. Stand on the top of Tails work shop as Tails and fly to the ledge in front of it.
 4. Go to the train station as Knuckles or Tails an d fly up on to the ledge in front of the train.
User Cheat by ayogamanda

Gold Chao:
to get a gold chao go to the garden outside the town hall in station square and the big rock then take it in the shop and remove what seems to be a green egg from the switch you will notice that the doors and windows will lock up so you put the rock the switch and every thing will open then then take the egg back and hatch it.
User Cheat by paddypwr

Getting a Silver Chao Egg:
Go to the Mystic Ruins with any character to the lake. On the right there should be a ledge sticking out of the rock wall. Push it and a Silver Chao Egg comes cascading down the waterfall. Take it to the Chao Garden and hatch it.
User Cheat by krylon1010