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Sonic Adventure

Faster Sonic spins:
Continuously tap X or B to spin faster.

Play as Super Sonic:
Complete the game using all six starting characters to unlock Super Sonic. 
Sonic will transform into Super Sonic after some time into the next game.

Bonus NiGHTS area:
Drop in the top hole while playing in the pinball section of the casino 
level to reach another pinball machine. Place the ball into the middle hole 
to fly through a warp and reach an area based on NiGHTS.

Play as Tails:
Controller two may be used for Tails after he is obtained during game play. 
Note: Shields, invincibility and extra life boxes have no effect on Tails if 
collected.

Full pause screen:
Pause game play, then press Y + X.

Alternate Twinkle Park Race views:
Press Up during the Twinkle Park Race level to change views.

Alternate snowboards:
Press X immediately before entering the snowboarding portion of the game to 
get a blue snowboard or B for a yellow snowboard.

Hidden artwork:
Put the game disc in a PC compatible CD-ROM drive to find additional images 
from the game in the "extras" directory.

Hint: Defeating the whale:
When on the whale stage(s), run over a speed ramp as soon as it appears. 
Then, do not press anything on the controller; the CPU will do the rest.


Hint: Hurt Perfect Chaos at less than maximum speed:
You can hurt Perfect Chaos without going top speed, although you have to be 
fast. Go onto the road and speed up. Stop moving during that until you are 
not in a Blue Shock ball, then quickly move into Chaos. If done correctly, 
you will hurt him without going at maximum speed.

Hint: Chao moods:


Heart: Happy
Swirl: Angry
Question Mark: Confused
Exclamation Mark: Surprised
XX over eyes: Angry
-- over eyes: Happy
Half Closed eyes: Tired
Waving Arms: Wants Attention
Flailing Arms: Angry
Hint: Silver Chao egg:
Go to the Mystic Ruins. Go to the water fall located in the middle of the 
Adventure Field. Push the stone that is jutting out of the wall to the right 
of the water fall. A silver egg will fall from behind the waterfall and 
float to shore. When it hatches, a silver Chao will be born.


Hint: Golden Chao egg:
Go to the Station Square area. Then, go to the area when you fought Chaos 
for the first time. Look to the side of the City Hall entrance to find egg 
shaped rock. Take the rock to the building to the left from City Hall. Walk 
to the window to see a golden Chao egg. However, if you try to take it the 
front door will lock. Replace the egg with the rock and the door will 
unlock, allowing you to leave with the egg. When the egg hatches you will 
have a golden Chao.


Hint: Black and blue Chao egg:
Go to the egg carrier. Then, go the jail area where Amy was kept. In the 
cell next to where she was held is a black and blue egg. Step on the switch 
to open the door. Take the egg to the garden. When it hatches, it will be a 
dark grey and dark blue Chao.

Hint: Special Chao:
Collect at least 100 emblems to get access to a special section called the 
Black Market on the Dreamcast Network. A Special Chao can be downloaded from 
this area.


Hint: Get all five Chaos Emeralds with the Chao:
To get all five of the Chaos Emeralds that you can get with the Chao, you 
need to log on to the Dreamcast Network and go to the Chao Daycare Section. 
Download one of the Chaos that are 999 in all four categories. Return to 
your Chao Garden and race him in a Chao Race. He will leave easily defeat 
all the other Chao. Repeat this on all five races to get the five possible 
Chaos Emeralds.

Hint: Sonic The Armadillo:
Go to the past when the Master Emerald altar is on fire. Move the camera so 
Sonic is facing the screen head on. In the red light, he looks just like 
Mighty The Armadillo from Knuckles Chaotix game on the Sega 32X.

Hint: Mystical Ruins extra life:
Tail's workshop is located all the way at the top of the mountains in the 
Mystical Ruins. Go to the very top and look around to find an extra life. 
Use the spin attack to zoom over and collect it.

Hint: Easy coins with E102 Gamma in Adventure field:
Go to station square and in the hotel, go up the stairs to the second floor. 
Stand at the very top step. Shoot your laser at the second button on the 
floor. Keep shooting to get coins.

Hint: Easy coins with Tails:
Find a patch of dark green grass. Move over and stand on it, then twirl your 
tail around. A group of coins will appear out of nowhere.


Hint: Easy coins with Knuckles:
Go to almost any spot of dirt or grass, then press A + B to dig down and 
come up with many coins.

Hint: Take a shower:
Go to the Casinopolis zone as Sonic and enter the shower area. Get into one 
of the stalls and push against the wall to give Sonic a shower.

Hint: 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.

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.
Hint: 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.
Complete 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.
Hint: Change Station Square appearance:
Connect to the Dreamcast Network through the Sonic Adventure disc and 
download the new file.
Hint: Go up the mountain as Tails:
It is possible to go up the mountain as Tails in level 3. Aim Tails up and 
keep pressing Up while jumping. It is difficult to tell what Tails is doing, 
but this is a good way to pick up arches that were missed.
Glitch: Sonic in the sand hill:
Get on top of the ledge and pushing the button to drain the sand. Locate the 
sand hill cave, but do not enter. Move a short distance back out of the cave 
entrance. Charge up your speed of light dash, but not to the point where he 
says "Ready". Release, then jump immediately before you go over the little 
bump or lip. If done correctly, Sonic will end up in the sand hill. Note: It 
is just like the sand hill in trial mode.


Glitch: Skip Egg Carrier loading time:
There is a way to skip the loading time on the stairs on the docks at the 
Egg Carrier. First, go to the dock. Angle Sonic so that he is on the 
opposite side from the boat. Then, jump diagonally on to the stairs and keep 
jumping up to get to the top. For fun, jump off the stairs to see Sonic 
float for a bit. You still cannot get to top because of loading time, so 
jump diagonally onto the Egg Carrier.

Glitch: Upside-down Knuckles:
When playing as Knuckles, fly in a circle by rotating the Analog-stick 
counter-clockwise. Do this as many times as possible, until Knuckles turns 
upside-down.

Thanks to Tommy_09!