Complete the game as Sonic.
Collect 100 rings.
Complete the game as Knuckles.
Finish the Lava Reef Zone.
Finish the Sandopolis Zone.
Collect all seven Chaos Emeralds.
Finish the Flying Battery Zone.
Finish the Mushroom Hill Zone.
Earn a Continue in either a Bonus or Special Stage.
Collect a Chaos Emerald.
Enter a Bonus or Special Stage.
Start the game once as each character.