Sonic Advance 3 - Platform: Gameboy Advance

Cheats:
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Submitted by: bourbon street 

Secret Stage mode:
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After complete all seven special stages, return to the main menu and 
press Up, L, Down, R, Right, Left. 

Play as Amy:
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Start a new game and successfully complete all three Acts of Toy 
Kingdom Zone to unlock Amy. 

Play as Cream:
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Start a new game and successfully complete all three Acts of Cyber 
Track Zone to unlock Cream. 

Play as Knuckles:
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Start a new game and successfully complete all three Acts of Sunset 
Hill Zone to unlock Knuckles. 

Sound test:
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Successfully complete the game. You do not need all the Chaos Emeralds. 
The "Sound Test" option will appear just above "Delete Game Data" in 
the options menu. 

Boss time attack:
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Successfully completed the game. Do not have all Emeralds but have a 
Golden Ring in all stages (Act 1, 2, 3 and vs. Boss). 

Change color settings:
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At the "Press Start" screen, press R. In the upper right corner, the 
game will display the color setting that you are currently on. Press 
R again to change the color settings. There are three color setting: 
"Game Boy Advance", "Game Boy Advance SP", and "Game Boy Player". 
The color settings optimize the color for the system that you are using. 

Easy height:
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Have Tails as your partner. If you missed an elevated platform or area 
during a level, use Tails' Tag action on the ground. About 95% of the 
time you will be able to reach what you fell off from. Note: This can 
also be done to access certain areas of the Act faster. 

Eggman as partner:
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After collecting all the Emeralds, play the "Final Boss level" with 
Sonic as the leader and anyone else as your partner. Once you change 
to Super Sonic, Dr. Eggman will become your partner in order to help 
you defeat the final Boss. 

Defeating Eggman:
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Play as Knuckles and Tails. Have Knuckles as your lead and when you 
face Eggman, use Knuckles' glide. Having Tails as your partner will 
give Knuckles more elevation on his glide, allowing you to hit Eggman's 
weak spot without any elevation help from the hands or the balls that 
fly around. 

Sonic The Hedgehog reference:
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In Zone 2, Sunset Hill, the music that plays is a remix of Green Hill 
Zone from Sonic The Hedgehog.




Secret Stage Mode: 
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Complete all 7 special stages, then, on the main menu, press Up, R, Down, 
L, Right, Left 

Sound Test:
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Beat the final zone 


Hint:
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Submitted by: Abhilash

On d screen while selecting a character jus highlight sonic n press Up 
button then tails by pressing down button to unlock d next character!
He i've created it,i don't know if it works or no!:P