Sonic Advance 3 Game Boy Adv Unlockables

Extra Zone

• Get All 7 Chaos Emeralds,Then Beat The Final Zone With Sonic As The Leader
  Extra Zone

Sound Test

• Beat the final zone.
  Sound Test

Time Attack (Boss)

In ALL zones and acts, get medals of all colors(Final and Extra zone also)

unlock Amy

• Beat zone 4 act 3 with Sonic as leader
  Amy

Unlock Bosses in Time Attack

First get the gold medals for every level and boss. Then beat Nonaggression. Cheese tells you that Boss Time Attack is available at the end of the credits.

unlock Cream

• Beat zone 6 act 3 with sonic as leader
  Cream

Unlock Knuckles

• Using Sonic as your leader finish Stage 2 Act 3 and beat Gemerl.
  Knuckles