Sonic Advance 3 Cheats - GBA

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

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.

Sound test
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
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
Press [R] at the "Press Start" screen. 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.

Defeating Eggman
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.

Use the following trick to defeat Eggman at the Alter Emerald easily. Select the Sonic/Tails combo. After you defeat the sub-Boss robot, you will face a giant robot Boss. An easy way to defeat him is to use Tails' Tag Action in the air. You will start flying. Use Tails' spinning tails as a weapon against Eggman. You will hit him a maximum of three times. Beware of his hands, though. The more you hit him, the more attacks he will use on you. The two you should really watch out for are his hands trying to remove two of the ground tiles; and when he uses the red metal balls as ping-pong balls. This can help you get a gold medal in the Alter Emerald level and get to the Nonaggression level easier (if you have all the Emeralds).

Use a team consisting of Cream and Tails/Cream and Knuckles in story mode. Continually fire Cheese the Chao at him to blow him up quickly.

Eggman as partner
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.

Easy height
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.

Moonwalk
Your character can run backwards by holding [R] and preparing the Tag Action (do not use it). Run and jump in the air. When in the air, press the D-Pad in the opposite direction you are running and do not touch it afterwards. Your character will run in a direction and he or she will be facing the other way. This is best done as Sonic, as he is the fastest character.

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