Sonic Chaos/Hidden content

Back to: Sonic Chaos.

1 Zone Select
2 Sound Test
3 Hadouken
4 Free Chaos Emerald
5 Sonic & Tails Kattobi Saisoku Technique
6 Unused content
7 Build date
8 Cheat device codes
- 8.1 Game Genie
  - 8.1.1 Official codes, Game Gear Version
- 8.2 Pro Action Replay
  - 8.2.1 Unofficial codes, Game Gear Version
  - 8.2.2 Unofficial codes, Master System
9 References

Zone Select

On the main title screen, press , then either or for the Master System version, and for the Game Gear version. An Extra Life sound will confirm correct entry. This is a variant of the Konami Code.

On the Game Gear Micro version the code is simplified to .^[1]

Sound Test

On the main title screen, press , then either or for the Master System version, and for the Game Gear version. Like the level select code, this is a variant of the Konami Code.

On the Game Gear Micro version the code is simplified to .^[1]

Hadouken

Activate the sound test, and press , then or . This will make Sonic shoot a fireball from his hands, similar to Ryu from the Street Fighter series.

Free Chaos Emerald

On the character select screen of the Game Gear version, press: . You'll kick your adventure off with one Chaos Emerald.

Sonic & Tails Kattobi Saisoku Technique

SonicChaos GG KattobiSaisokuTechnique.png

The December 1993 editions of Japanese magazines Shogaku Sannensei, Shogaku Yonensei and Shogaku Rokunensei ran a "Sonic & Tails Kattobi Saisoku Technique" (ソニック&ティルスかっとび最速テクニック) contest - essentially a time trial of Turquoise Hill Zone.^[2]

Four categories existed for Acts 1 and 2 as either Sonic or Tails - to enter, contestants had to finish the level with a speed rating greater than 700km/h, pause the game when said rating was on-screen and hold ++ for a six-digit hexadecimal code. The player would then send this in and the magazine would determine the winner.

This feature only exists in the Japanese Game Gear version of Sonic & Tails. International releases of Sonic Chaos have it removed.

Unused content

Art

Art	Description
	Diagonal spring with blue background for Turquoise Hill Zone.
	Springs with backgrounds for Gigalopolis Zone.
	Spikes with backgrounds, also for Gigalopolis Zone.
	A left-facing quarter pipe for Gigalopolis zone. This was used in the 1993-04-17 prototype of Sonic Chaos but the collision was wrong.
	Diagonal spring with background for Sleeping Egg Zone.
	Spikes for Sleeping Egg Zone.
	A 45-degree slope.
	left-facing quarter-pipe.
	Diagonal springs with backgrounds for Mecha Green Hill Zone.
	Spikes with backgrounds for Mecha Green Hill Zone.
	Mecha Green Hill Zone block. There are lots of similar pieces used, but not this one.
	Springs for Aqua Planet Zone.
	Background pieces for Aqua Planet Zone.
	Another spring, this time for Electric Egg Zone.
	Another left-facing quarter pipe, also for Electric Egg Zone.
	Springs for the first type of Special Stage.
	Diagonal tile for the first type of Special Stage.
	Spikes.
	Quarter pipes.
	Scenery for the second type of special stage.
	Ramps and a quarter pipe.

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?

Audio

Audio	ID	Description
	`08EH`	A short jingle that is not used in either version.
	`09BH`	One of the tracks added in the Game Gear version that goes unused. This was later recycled for Sonic the Hedgehog Triple Trouble as the Sunset Park Zone Act 3 song, albeit in a lower key.

Build date

Similar to other games developed by Aspect, the game's build date can be located at ROM address $C0:

	MS SONIC¥CHAOS < Ver1.20 > 1993/08/03 @SEGA/Aspect Co.,Ltd
Japanese version	GG SONIC & TAILS < Ver1.01 > 1993/09/07 @SEGA/Aspect Co.,Ltd
Western versions	GG SONIC¥CHAOS < Ver1.00 > 1993/09/01 @SEGA/Aspect Co.,Ltd

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	Effect	Reference
`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 Gigalopolis 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 Gigalopolis 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	Effect	Reference
`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: Gigalopolis 2: Sleeping Egg 3: Mecha Green Hill 4: Aqua Planet 5: Electric Egg
`00D740:00`	No Enemies.

Unofficial codes, Master System

Code	Effect	Reference
`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