Unlock Cream
Complete the Leaf Forest level using Sonic to unlock Cream.
100% success rate. 

Unlock Bonus Level
Complete the game with all seven Chaos Emeralds using Amy, Cream, Knuckles, Sonic, and Tails to unlock a new level at the end of Sonic's map screen.
100% success rate. 

Unlock Tails
Complete the Music Plant level using Sonic to unlock Tails.

Unlock Knuckles
Complete the Sky Canyon level using Sonic to unlock Knuckles.

Unlock Amy
Complete the game with all seven Chaos Emeralds as Cream, Knuckles, Sonic and Tails to unlock Amy.

Unlock Tiny Chao Garden
Complete the game with all seven Chaos Emeralds with any character to unlock Tiny Chao Garden.

Unlock Sound Test
Complete the game with all seven Chaos Emeralds using any two characters to unlock the sound test.

Unlock Boss Option in Time Attack
Complete the game with all seven Chaos Emeralds using any three characters to unlock the 'Boss' option in time attack mode.

Go to: Sonic Advance 2 Info Page | nGaming Home Page.