Cheat: Bonus Stage:
Beat all special stages and on the main menu press UP, R, DOWN, L, RIGHT, LEFT.
Unlockable: Characters:
* Knuckles: Beat sunset hill act 3 with Sonic as leader.
* Amy: Finish Zone 4 act 3 with sonic as your leader.
* Cream: To unlock Cream finish Zone 6 act 3.
Unlockable: Sound Test:
Beat the final zone to unlock a sound test.
Hint: Screen Settings:
At the title screen press R to change the screen settings. The original setting is for GBA, LCD 2 is for GBA SP, and LCD 3 is for playing the game on a TV.
Play as Knuckles:
In a new game, complete all three Acts of Sunset Hill Zone with Sonic as the leader.
Play as Amy:
In a new game, complete all three Acts of Toy Kingdom Zone with Sonic as the leader.
Play as Cream:
In a new game, complete all three Acts of Cyber Track Zone with Sonic as the leader.
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