Two player Team Battle mode:
Collect 20 emblems in single player story or challenge mode. 

Two player Special Stage mode:
Collect 40 emblems in single player story or challenge mode. 

Two player Ring Race mode:
Collect 60 emblems in single player story or challenge mode. 

Two player Bobsled Race mode:
Collect 80 emblems in single player story or challenge mode. 

Two player Quick Race mode:
Collect 100 emblems in single player story or challenge mode. 

Two player Expert Race mode:
Collect 120 emblems in single player story or challenge mode. 

Metallic Team Sonic characters in two player modes: 
Select a two player mode. Hold A + Y when making a choice at the character 
selection screen. Keep the buttons held through the level selection screen and 
release them when game play begins. 

Metallic characters in single player mode: 
Collect 141 emblems in single player story or challenge mode. 

Follow Me song:
Successfully complete story mode as Team Rose. 

Team Chaotix song:
Successfully complete story mode as Team Chaotix. 

This Machine song:
Successfully complete story mode as Team Dark. 

We Can song:
Successfully complete story mode as Team Sonic. 

Team Chaotix FMV sequence:
Successfully complete story mode as Team Chaotix to unlock their FMV sequence 
in the CG Theater. 

Team Dark FMV sequence:
Successfully complete story mode as Team Dark to unlock their FMV sequence in 
the CG Theater. 

Team Rose FMV sequence:
Successfully complete story mode as Team Rose to unlock their FMV sequence in 
the CG Theater. 

Team Sonic FMV sequence:
Successfully complete story mode as Team Sonic to unlock their FMV sequence in 
the CG Theater. 

Super Hard difficulty setting:
Successfully complete the game with all "A" ranks and 141 emblems. 

Defeating Egg Emperor:
To defeat the Egg Emperor, you have to destroy the shield of the robot. Then, 
keep attacking the blue/purple circle on the chest until its HP goes to zero.

First, destroy any enemy in your path and collect as many rings as possible, 
dodging the attacks as you go. When you get to the "arena", destroy all cannons, 
collect ring containers or balloons, and destroy robots until you have filled your 
Team Blast. Then, launch it in range of Egg Emperor. Your aftereffect will boost 
you while you attack. When you have no more of an aftereffect, switch to Flying 
Formation and continuously press Action to launch Thunder Shoot repeatedly to 
greatly damage him. Repeat this until he is defeated. 

Defeating Egg Hawk:
Run down the path of rings, avoiding Eggman's fire. The entire battle will have you 
running around in a giant circle. There are Power Cores in boxes and on the sides 
of the beaches, but you will not need them to defeat this opponent. When you 
reach the beach areas, Dr. Eggman will land the plane (if slow enough). He will 
begin to spin the plane and fire. Change to your Power Formation then attack the 
right gunner and damage the plane's body. Attack him as much as you can until 
his HP reach 0. 

Defeating Team Boss:
When you fighting a Team Boss use Blue Tornado on them by choosing the Speed 
Formation for any Team desired.

Defeating Team Sonic, Chaotix, Dark and Rose:
The object of the battle is simple -- knock the other team off the ledge to win. This 
is very easy. Get as many Power Cores as possible. Then, attack with the Thunder 
Shoot (while flying) or use the Tornado Jump on top of the characters. Or, use the 
character that is the Power type and hit them off.

Bingo Highway: Perfect Bingo:
Get all of the numbers and you will win about 100 rings (one life). Note: You can 
do this best as Team Chaotix.

Metal Overlord: Faster Team Blast: 
Since you are flying in the ozone layer and are automatically moving in different 
directions, you cannot use your Fly Formation character to help your Team Blast 
meter fill up. Instead, go near the Metal Overlord with your Power Formation 
character and keep pressing X. Your meter will go up.

Robot Carnival: Easy lives for Team Chaotix:
When you have many robots, use Team Blast and you will have more than 100 
rings because Team Chaotix can get rings from every enemy with their Team 
Blast.

Playing final stage in story mode: 
When you complete one of the story modes, go to the challenge screen. Notice 
that one of the stages is not there. To play this stage you must get all seven 
Chaos Emeralds. You can get the Chaos Emeralds by playing the stages before 
you face the Boss. Get the key for that stage and go to the bonus stage. Then, 
catch the Chaos Emerald before you get to the end of the bonus stage. Once you 
get the all seven Chaos Emeralds, you can play the final stage. There is only one 
Chaos Emerald for each set of levels.

Chaos Emerald bonus stage:
Get all of the keys in all of the even-numbered stage (for example, Stage 2: 
Ocean Palace).

Easy special stages:
To easily get the Emerald, use Team Sonic or Team Dark. Use Team Rose if you 
want to easily get the key. 

Final battle:
Successfully complete the game with everyone to face Dr. Robotnik in one final 
battle where everyone is combined to defeat him once and for all.

Easy Team Blast:
As Team Chaotix, have Espio as the leader then use the Tornado Spin. He will then 
turn invisible. Then, stand in a place where you will not get hurt or fall down. Keep 
pressing Action to throw as many ninja stars to gain the full Team Blast.

It is normally difficult to get a Team Blast (unless you use Team Chaotix). 
However, if you use your fly formation character, hold A and you will be in the air. 
Next, quickly tap X repeatedly until your Team Blast meter is up.

Use Team Blast twice:
To use your Team Blast twice, immediately after you use it switch to your speed 
character, then jump and press X. You must be around enemies when you use it 
again, and it still must read "Team Blast" at the top of the screen. Note: This trick 
can only be used with the Sonic Team.

Sonic Team Blast:
After you do Team Blast, jump with Sonic and press X. He will do the homing 
attack.

Stop time:
As Team Dark, after you do a Team Blast time will be frozen until your Team Blast 
meter empties.

Easy coins:
To get easy coins, jump on the three stars on the three starred bumper. Note: You 
will only get a five or ten coin block. 

Getting Chaos Emeralds:
Once you obtain a Key, go to the bonus round. In that round, you must chase the 
Emerald to the end of the round.

If you miss the Emeralds on the story mode as all four teams and are forced to go 
to challenge to do it, select Team Rose. They have the shortest and easiest levels 
of the four teams.

Get mask off robot without making him spin:
Switch to Power Formation and get close so you can auto-home into the robot's 
mask. Note: This does not always work. 

No-faced Cheese:
Enable the metallic characters for Team Rose. Notice that Cheese has no face.

Gold Sonic (Super Sonic):
Get all of the Chaos Emeralds on Team Sonic and defeat that team. Go against 
Metal Madness and Sonic will become Gold Sonic (Super Sonic).

All missions for Team Chaotix:

SeaSide Hill: Find all ten Hermit Crabs.
Ocean Palace: Rescue the Chao in the palace.
Grand Metropolis: Clear out the enemies in the city (85).
Power Plant: Defeat the three Gold Camerons.
Casino Park: Win 200 rings.
Bingo Highway: Collect ten casino chips.
Rail Canyon: Infiltrate the terminal station.
Bullet Station: Destroy thirty capsules.
Frog Forest: Avoid detection by the Frogs.
Lost Jungle: Rescue ten Chao.
Hang Castle: Get the keys in the castle.
Mystic Mansion: Blow out all sixty red torches.
Egg Fleet: Avoid enemy detection.
Final Fortress: Find the keys to the client's cell. 

Team Blasts:
Team Sonic: ? 

Team Dark: 
Chaos Inferno. Temporarily stops the time after the Omega's Blast is fired. 

Team Rose: 
Flower Festival. After the blast is executed, every team member increases in level 
by one and becomes invulnerable for a short period of time. 

Team Chaotix: 
Chaotix Rectical. After the blast is executed, each enemy destroyed will give you a 
certain number of rings.