Sonic Chaos/Hidden content

Cheat Codes

These are cheat codes which can be accessed by inputting button sequences or by various other methods. Note that the Sound Test and Level Select use variations of the famous Konami Code.

Cheat Codes, All Versions

• Sound Test: If you want to hear the great tracks that this game has to offer, and who could blame you, simply press , then either or for the Master System version, and for the Game Gear version, at the main title screen (before you choose characters). This Sound test features some unused sounds and even some tracks from Sonic 2.
  • Throw Fireballs: One of the weirdest cheats for any Sonic game, activate sound test, and press , then or .

• Level Select: Contrary to popular belief, there IS a level select code. At the title screen, press , then either or for the Master Sytstem version, and for the Game Gear version.

• Free Emerald: (Game Gear version) At the character select screen, press: . You'll kick your adventure off with a headstart of one Chaos Emerald.

Extra Tiles in Opening Cutscene

In the opening cutscene, a sprite of Tails running can be found in the VRAM. However, when Tails is eventually revealed, he's walking, not running. Could it be possible that he was meant to run along with Sonic rather than walk after him when he goes off-screen?

Unused Music

• When accessing the Sound Test feature, the song 099H can be heard. This is the intro screen music for the Sega Master System version and the title screen music for the Game Gear version of Sonic 2.
• When accessing the Sound Test feature in the Game Gear version, the song titled "BGM#09BH" can be heard, but was not used in the game. The track was later used in Sonic Triple Trouble as the Sunset Park Act 3 song.

Fireball

In the Sound Test screen, Sonic can shoot a fireball by pressing , then or .

• 

  Game Gear version

• 

  Master System version

Cheat device codes

These are cheat codes that can only be used with game enhancer devices. Support for these codes is available in most emulators.

Game Genie

Official Codes, Game Gear Version

Code	Description
008-3BD-E6E	Infinite time.
022-1EC-E6E	Each ring worth 2.
042-1EC-E6E	Each ring worth 4.
062-1EC-E6E	Each ring worth 6.
082-1EC-E6E	Each ring worth 8.
0A2-1EC-E6E	Each ring worth 10.
3A9-DCB-2A2	Never lose rings.
22A-91D-2A2	Start with some rings most of the time.
3A6-24E-2A2	Infinite lives.
016-93C-E66	Sonic starts with 1 life (Don't combine any of these lives altering codes with the "Start on Level" codes).
096-93C-E66	Sonic starts with 9 lives.
506-93C-E66	Sonic starts with 50 lives.
996-93C-E66	Sonic starts with 99 lives.
014-23E-E66	Sonic continues with 1 life.
094-23E-E66	Sonic continues with 9 lives.
504-23E-E66	Sonic continues with 50 lives.
994-23E-E66	Sonic continues with 99 lives.
016-99C-F7E	Tails starts with 1 life.
096-99C-F7E	Tails starts with 9 lives.
506-99C-F7E	Tails starts with 50 lives.
996-99C-F7E	Tails starts with 99 lives.
014-28E-F7E	Tails continues with 1 life.
094-28E-F7E	Tails continues with 9 lives.
504-28E-F7E	Tails continues with 50 lives.
994-28E-F7E	Tails continues with 99 lives.
1F6-9EC-08F + 996-A0C-F7D	Sonic starts on Gigapolis Zone (Don't combine any of these lives altering codes with the "Start on Level" codes).
3D6-9EC-08F + 996-A0C-F7D	Sonic starts on Sleeping Egg Zone.
006-9EC-08F + 996-A0C-F7D	Sonic starts on Mecha Green Hill Zone.
3C6-9EC-08F + 996-A0C-F7D	Sonic starts on Aqua Planet Zone.
056-93C-E66 + 006-9EC-08F + 996-A0C-F7D	Sonic starts on Electric Egg Zone with 5 lives.
016-99C-F7E + 1F6-9EC-08F + 996-A0C-F7D	Tails starts on Gigapolis Zone with 1 life.
1F6-9EC-08F + 996-A0C-F7D	Tails starts on Sleeping Egg Zone.
036-99C-F7E + 006-9EC-08F + 996-A0C-F7D	Tails starts on Mecha Green Hill Zone with 3 lives.
3D6-9EC-08F + 996-A0C-F7D	Tails starts on Aqua Planet Zone.
006-9EC-08F + 996-A0C-F7D	Tails starts on Electric Egg Zone.

Pro Action Replay

Unofficial Codes, Game Gear Version

Code	Description
00D3B1:01	Invincible After Being Hit Once.
00D29B:09	Infinite Lives.
00D29C:99	Infinite Rings (Change 99 to a lower value to avoid the Bonus Stage).
00D2C1:99	Infinite Time.
00D2CA:0?	Character Modifier (1=Sonic, 2=Tails).
00D2D0:0?	Cheat Enable Modifier (1=Zone Select, 2=Sound Test).
00D50C:95	High Jump (Enable during level).
00D299:0?	Level Select. (Enable after intro) 0 - Turquoise Hill 1 - Gigapolis 2 - Sleeping Egg 3 - Mecha Green Hill 4 - Aqua Planet 5 - Electric Egg
00D740:00	No Enemies.

Unofficial Codes, Master System

Code	Description
00D3B1:01	Invincible After Being Hit Once.
00D299:09	Infinite Lives.
00D29A:99	Infinite Rings (Change 99 to a lower value to avoid the Bonus Stage).
00D50C:95	High Jump (Enable during level).
00D297:0?	Level Select. (Enable after intro.) 0 - Turquoise Hill 1 - Gigalopolis 2 - Sleeping Egg 3 - Mecha Green Hill 4 - Aqua Planet 5 - Electric Egg