Two player Special Stage mode:

Collect 40 emblems in single player story or challenge mode.

Two player Team Battle mode:

Collect 20 emblems in either 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 X + Triangle(for ps2) (A + Y for xbox and gamecube) 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.

Hint: 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.

Hint: Defeating Egg Hawk:

Run down the path of rings, avoiding Eggman's fire. When you reach the beach areas, Dr. Eggman will land the plane. 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.

 

Hint: Defeating: Eggman:

When Eggman (Dr. Robotnik) leads you onto one of the platforms and stops, fly up in Fly formation and use Thunder Shoot to attack.

Hint: Defeating Metal Madness:

Coming Soon...

Hint:-Defeating Team Boss:

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