Sonic Advance 3 Cheats

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

Unlock Knuckles:
In a new game, complete all three Acts of Sunset Hill Zone with Sonic as the leader.
User Cheat by CaseyB

Unlock Amy:
In a new game, complete all three Acts of Toy Kingdom Zone with Sonic as the leader.

Unlock Cream:
In a new game, complete all three Acts of Cyber Track Zone with Sonic as the leader.

Sound test:
Finish 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:
Finish the game. Do not have all Emeralds but have a Golden Ring in all stages (Act 1, 2, 3 and vs. Boss).
User Cheat by CaseyB

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.

How to beat 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.

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. REMEMBER: 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.

Grind with a surfboard:
Put Sonic as the leader and Amy as your partner. Grind on a rail and Sonic will grind with a surfboard.

Better springs:
Play as Amy or have Amy as your partner. Hit a spring with the "Hammer Attack". The spring will give you more of a boost.

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

Sonic Advance 3 Review - GameZone

Sonic Advance 3 Review - Nintendojo

Sonic Advance 3 Review - IGN