Sonic the Hedgehog 2 uses a special graphics mode of the Megadrive/Genesis to achieve a split-screen playmode. This mode imposes additional requirements on the tile data for correct display. SonED2 is capable of converting tilesets to conform to some of these rules, while others are cosmetic and cannot be accounted for by any automated system.
This page contains CodeBreaker cheat codes for Sonic Advance 2 (USA). If you're playing on an emulator you can usually input codes very easily by accessing a tab off the top of the toolbar. Anyone playing on a physical Gameboy will need to purchase a physical Codebreaker device to use these codes.

I have created one list of roms hacks to download, it have 161 hacks in list. The name of roms hack is listed below:

Sonic Advance PalTool: 1.00.0011: Erik JS: Palette editor for the GameBoy Advance Sonic games. Sonik Sprite: Beta: Uncompressed sprite editor for Sonic 1, 2, 3 and Sonic & Knuckles. Sonik Sprite Remix: Beta: New version of Sonik Sprite, with improved speed and the ability to edit compressed art. Only supports Sonic 1 so far. Download Sonic Adventure 2 Battle ROM for GameCube and Play Sonic Adventure 2 Battle Video Game on your PC, Mac, Android or iOS device! Description: This is a level editor for the Sonic the Hedgehog series of games on the Genesis. It supports Sonic 1, Sonic 2, Sonic 2 Beta, Sonic 3, and Sonic & Knuckles plus has some built in features useful to ROM hackers (Decompressor, Compressor, Game Genie code conversion, IPS patcher, and ROM conversion).

Pause and resume file transfers. Teracopy pro full version 3.2 with serial keys. Copy files faster: TeraCopy uses dynamically adjusted buffers to reduce seek times. Features of TeraCopy. Asynchronous copy speeds up file transfer between two physical hard drives.

Amy in Sonic 1 v1.0
Anti-Sonic the Hedgehog 2
Ashura in Sonic 1
Ashura the Hedgehog
ATOMICSONIC
ChimpoQ!
Eggman in Sonic 1
Knuckles in Sonic 1
Knuckles in Sonic 2 (BIOHAZARD)
Mighty the Armadillo Beta 0.3
Mighty the Armadillo Beta 1.0
Mighty the Armadillo Beta 1.5
Mighty the Armadillo Beta 3.0
Mighty the Armadillo v.4.16
New Sonic 2 1.5 (U) (REV01)
New Sonic 3
NSA 2 beta 1 demo
Project Shadow 2 Demo 4 (v1.00)
Project Shadow Demo 4 Bonus
Ray in Sonic 1 v4.0
Red Hot Sonic 2
Robotnik's Revenge v1
Sonic 1 & Knuckles - Tails In Special Stages
Sonic 1 Alpha Hoax
Sonic 1 Amy
Sonic 1 Athens
Sonic 1 Beta Hoax
Sonic 1 Beta Remake v004
Sonic 1 Bouncy Edition
Sonic 1 chao walker
Sonic 1 Code Gray V1.0
Sonic 1 dr iks
Sonic 1 Easy
Sonic 1 Extended Edition (First Release)
Sonic 1 Fantasy Worlds Release 0.99 Super Sonic Build
Sonic 1 Fantasy Worlds Release 0.99
Sonic 1 Fantasy
Sonic 1 Gaiden v04
Sonic 1 Harder Levels (6th Project's aniversary)
Sonic 1 Harder Levels v005 Beta 2
Sonic 1 Harder Levels v005 DEMO 01
Sonic 1 Hyperx V1
Sonic advance 2 rom hacks

Sonic 1 Mega Hack Public Release 1
Sonic 1 Mega Hack Ultra Rare Version
Sonic 1 Megamix v1.0
Sonic 1 Megamix v2.0
Sonic 1 Megamix v3.0
Sonic 1 Megamix v4.0 (U).iso
Sonic 1 Metal Sonic
Sonic 1 Metallix
Sonic 1 Mobius Adventures 2.5
Sonic 1 Mobius Adventures 2.7.5
Sonic 1 Neo Adventures v0.1
Sonic 1 Neo Adventures v0.2
Sonic 1 New Version EggMan Attack!
Sonic 1 Nineko Edition
Sonic 1 Oergomized v4.2
Sonic 1 OMG THE RED RINGS
Sonic 1 Open Source Project 0.05
Sonic 1 Pixel Perfect Beta 1
Sonic 1 Planets in Marble Zone
Sonic 1 Plus v0.1
Sonic 1 Plus v0.2
Sonic 1 project unknown
Sonic 1 Psycho
Sonic 1 Real-Time Demo Recording
Sonic 1 Remastered v.1.1
Sonic 1 Remastered
Sonic 1 Remix WIP - Green Hill
Sonic 1 Remix
Sonic 1 Return to the Origin v2
Sonic 1 Richrodgers
Sonic 1 SA1
Sonic 1 Seizure
Sonic 1 South Island Adventure v0.3
Sonic 1 Spindash
Sonic 1 Splats The Rabbit
Sonic 1 SSRG Tech Demo
Sonic 1 SSRG [Built on 18th January 2009 22.02] [Demo] (Dedicated)
Sonic 1 Supersonic in South Island Adventure v0.2
Sonic 1 The 7th Emerald
Sonic 1 The Blue Blur
Download

Sonic 1 The Final Showdown (v2.1)
Sonic 1 Tikal
Sonic 1 TSH Beta 2
Sonic 1 TSH Beta 3
Sonic 1 Ultima 1337
Sonic 1 weird
Sonic 1 Westside Island
Sonic 1 with Sonic 2 Menu
Sonic 1 xmas
Sonic 1 ZX - January 24, 2009 Demo
Sonic 1 ZX
Sonic 2 & Knuckles Long Version v1.8
Sonic 2 (SA2 style - Light Side v1.6.7)
Sonic 2 Advanced Edit Release 3 beta
Sonic 2 Advanced Edit
Sonic 2 Aluminum Edition
Sonic 2 Armageddon Game
Sonic 2 Delta 0.23
Sonic 2 Delta 2
Sonic 2 Delta II 10A
Sonic 2 Delta III v0.2
Sonic 2 Delta IV v0.01
Sonic 2 Delta
Sonic 2 EX v.4.2
Sonic 2 GHZ v0.2
Sonic 2 Haven Light and Sunset
Sonic 2 haz
Sonic 2 hell
Sonic 2 Homing attack
Sonic 2 Ice Knights
Sonic 2 Innovative
Sonic 2 Long Version v1.8.1
Sonic 2 Lost Paradise Version 2
Sonic 2 Mecha World
Sonic 2 Megamix
Sonic 2 Millenium Edition v.0.85
Sonic 2 More Than A Memory - The Perfect Existance
Sonic 2 Omega
Sonic 2 Rabid
Sonic 2 Recreation Demo
Sonic 2 Remix
Sonic 2 Retro Remix (new version)
Sonic 2 Retro Remix
Sonic 2 S3 Edition v1.11
Sonic 2 Salus
Sonic 2 SMTP
Sonic 2 Team Black Force
Sonic 2 The Hybridization Project
Sonic 2 Tohaka v0.21
Sonic 2 ultimate
Sonic 2 Underwater
Sonic 2 xp
Sonic 2 Zeta Overdrive EHZ Beta
Sonic 2 Zeta Overdrive SAGE Beta

Sonic Advance 2 Rom Hack Download

Sonic 2 Zeta Overdrive
Sonic 2010 Demo 2 (aka Independence Demo)
Sonic 2K (1 Mb)
Sonic 2z v.0.50
Sonic 3 & Knuckles Master Edition
Sonic 3 Delta v0.1a
Sonic 3D (no flickie)
Sonic and the Secret Extended Edition
Sonic Boom
Sonic for MegaCD (U).iso

Sonic Advance 2 Rom Hacks

Sonic in paynt 2
Sonic in paynt
Sonic Rings 2 PRO
Sonic Rings 2
Sonic Rings 3 V0.1
Sonic Rings PRO
Sonic Rings
Sonic The Lost Land 2
Sonic The Lost Land
Sonic The Sequel - Unmastered (v2)
Sonic Uno v0.3a
Sonic X
Tails in Sonic 1 v2.1.1
The S Factor - Sonia and Silver
Zonic final version
Download link:
http://www.mediafire.com/?sharekey=4bc86a57ae98d4467432d3c9683f450a7b95b989a74d3d0a87095ac91101628c

As Sonic Advance can be hacked, Sonic Advance 2 can also be hacked the same way. There exists two methods to hack Sonic advance :

the first one consits in a direct editing in a portion of RAM called Internal RAM using Boycott Advance debugger (debugger is not activated by default in Boycoot Advance, you have to edit the BoycottAdvance.ini file, find a section called '## Debugging Features ##########' and finally write '1' on the field 'DebugMenuEnable' instead of '0'). It's the one I use, I think it's also the easiest one (because changes are immediately seen on the screen). ~~Note : that feature only exist in Boycott Advance emulator, Visual Boy Advance only has a RAM viewing feature.~~ Last minute : Visual Boy Advance version 1.1 now has an RAM editing possibitiy, wow ! Just go a few sections lower to see how to hack using Visual Boy Advance Debugger !!
the second one consists in editing a savestate (Boycott or Visual) with an hexeditor. But you must decompress it first by renaming the savestate file into a gz file and decompress it with WinZip. Here, you'll be able to hack.

Well, let's explain them in details.

RAM editing with Boycott Advance debugger

If you did the manipulation above correctly, a Debug menu should appear beside the others on Boycott Avance menu bar. Let's take a look at it. But load your game fisrt. Start a normal adventure with any character. Now, open the Debug menu. Go to 'Select Memory Address' and select 'Internal RAM'. Now, go back up and select 'Show Memory'. A dialog box showing data starting at the offset 03000000 should appear. To hack, simply double-click one line and you'll be able to edit it in real time, yay ! Now, you can go to the Startup data section in this guide to look fo