View source for Sonic Chaos/Hidden content

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==Zone Select==
{{HiddenContent
| image1=SonicChaos SMS LevelSelect.png
| image2=SonicChaos GG LevelSelect.png
| desc=On the main title screen, press {{up}} {{up}} {{down}} {{down}} {{right}} {{left}} {{right}} {{left}}, then either {{1}} or {{2}} for the Master System version, and {{start}} for the Game Gear version. An Extra Life sound will confirm correct entry. This is a variant of the [[wikipedia:Konami Code|Konami Code]].

On the [[sega:Game Gear Micro|Game Gear Micro]] version the code is simplified to {{up}} {{up}} {{down}} {{down}}.{{ref|1=https://game.watch.impress.co.jp/docs/interview/1277947.html}} 
}}

==Sound Test==
{{HiddenContent
| image1=SonicChaos SMS SoundTest.png
| image2=SonicChaos GG SoundTest.png
| desc=On the main title screen, press {{down}} {{down}} {{up}} {{up}} {{left}} {{right}} {{left}} {{right}}, then either {{1}} or {{2}} for the Master System version, and {{start}} for the Game Gear version. Like the level select code, this is a variant of the [[wikipedia:Konami Code|Konami Code]].

On the [[sega:Game Gear Micro|Game Gear Micro]] version the code is simplified to {{down}} {{down}} {{up}} {{up}}.{{ref|1=https://game.watch.impress.co.jp/docs/interview/1277947.html}} 
}}

==Hadouken==
{{HiddenContent
| image1=SonicChaosFireballMS.png
| image2=SonicChaosFireballGG.png
| desc=Activate the sound test, and press {{down}} {{downright}} {{right}}, then {{1}} or {{2}}. This will make [[Sonic the Hedgehog|Sonic]] shoot a fireball from his hands, similar to Ryu from the ''[[wikipedia:Street Fighter (series)|Street Fighter]]'' series.
}}

==Free Chaos Emerald==
{{HiddenContent
| noimage=yes
| desc=On the character select screen of the Game Gear version, press: {{up}} {{down}} {{up}} {{down}} {{1}} {{2}} {{1}} {{2}} {{1}} {{2}}. You'll kick your adventure off with one Chaos Emerald.
}}

==''Sonic & Tails Kattobi Saisoku Technique''==
{{HiddenContent
| image1=SonicChaos GG KattobiSaisokuTechnique.png
| desc=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]].{{ref|{{LinkRetro|topic=38915|title=Sonic Retro forum thread: Sonic & Tails time attack contest code}}}}

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 {{upleft}}+{{1}}+{{2}} 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===
{{UnusedTable|type=Art|
{{UnusedRow
| content=
| desc=Diagonal spring with blue background for [[Turquoise Hill Zone]].
}}
{{UnusedRow
| content=
| desc=Springs with backgrounds for [[Gigalopolis Zone]].
}}
{{UnusedRow
| content=
| desc=Spikes with backgrounds, also for Gigalopolis Zone.
}}
{{UnusedRow
| content=
| desc=A left-facing quarter pipe for Gigalopolis zone. This was used in the [[Sonic Chaos (Game Gear prototype; 1993-05-17)|1993-04-17 prototype]] of ''Sonic Chaos'' but the collision was wrong.
}}
{{UnusedRow
| content=
| desc=Diagonal spring with background for [[Sleeping Egg Zone]].
}}
{{UnusedRow
| content=
| desc=Spikes for Sleeping Egg Zone.
}}
{{UnusedRow
| content=
| desc=A 45-degree slope.
}}
{{UnusedRow
| content=
| desc=left-facing quarter-pipe.
}}
{{UnusedRow
| content=
| desc=Diagonal springs with backgrounds for [[Mecha Green Hill Zone]].
}}
{{UnusedRow
| content=
| desc=Spikes with backgrounds for Mecha Green Hill Zone.
}}
{{UnusedRow
| content=
| desc=Mecha Green Hill Zone block. There are lots of similar pieces used, but not this one.
}}
{{UnusedRow
| content=
| desc=Springs for [[Aqua Planet Zone]].
}}
{{UnusedRow
| content=
| desc=Background pieces for Aqua Planet Zone.
}}
{{UnusedRow
| content=
| desc=Another spring, this time for [[Electric Egg Zone]].
}}
{{UnusedRow
| content=
| desc=Another left-facing quarter pipe, also for Electric Egg Zone.
}}
{{UnusedRow
| content=
| desc=Springs for the first type of [[Special Stage (Sonic Chaos)|Special Stage]].
}}
{{UnusedRow
| content=
| desc=Diagonal tile for the first type of Special Stage.
}}
{{UnusedRow
| content=
| desc=Spikes.
}}
{{UnusedRow
| content=
| desc=Quarter pipes.
}}
{{UnusedRow
| content=
| desc=Scenery for the second type of special stage.
}}
{{UnusedRow
| content=
| desc=Ramps and a quarter pipe.
}}
}}

===Extra tiles in opening cutscene===
[[File:SChaostails.png]]

In the opening cutscene, a sprite of [[Miles "Tails" Prower|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===
{{UnusedTable|type=Audio|ids=yes|
{{UnusedRow
| content=[[File:SonicChaos GG SoundCode08EH.ogg]]
| id=08EH
| desc=A short jingle that is not used in either version.
}}
{{UnusedRow
| content=[[File:SonicChaos GG SoundCode09BH.ogg]]
| id=09BH
| desc=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==
{{HiddenContent
| noimage=yes
| desc=Similar to other games developed by [[sega:Aspect|Aspect]], the game's build date can be located at ROM address '''$C0''':
}}
{| class="prettytable" style="width:auto;"
|-
!{{SMS}}
|<pre>MS SONIC¥CHAOS    < Ver1.20 >   1993/08/03 @SEGA/Aspect Co.,Ltd</pre>
|-
!{{GG}} Japanese version
|<pre>GG SONIC & TAILS  < Ver1.01 >   1993/09/07 @SEGA/Aspect Co.,Ltd</pre>
|-
!{{GG}} Western versions
|<pre>GG SONIC¥CHAOS    < Ver1.00 >   1993/09/01 @SEGA/Aspect Co.,Ltd</pre>
|}

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

=== Pro Action Replay ===
==== Unofficial codes, Game Gear Version ====
{{CodeTable|official=yes|
{{CodeRow|00D3B1:01|Invincible After Being Hit Once.}}
{{CodeRow|00D29B:09|Infinite Lives.}}
{{CodeRow|00D29C:99|Infinite Rings (Change 99 to a lower value to avoid the Bonus Stage).}}
{{CodeRow|00D2C1:99|Infinite Time.}}
{{CodeRow|00D2CA:0?|Character Modifier (1: Sonic, 2: Tails).}}
{{CodeRow|00D2D0:0?|Cheat Enable Modifier (1: Zone Select, 2: Sound Test).}}
{{CodeRow|00D50C:95|High Jump (Enable during level).}}
{{CodeRow|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}}
{{CodeRow|00D740:00|No Enemies.}}
}}

==== Unofficial codes, Master System ====
{{CodeTable|official=yes|
{{CodeRow|00D3B1:01|Invincible After Being Hit Once.}}
{{CodeRow|00D299:09|Infinite Lives.}}
{{CodeRow|00D29A:99|Infinite Rings (Change 99 to a lower value to avoid the Bonus Stage).}}
{{CodeRow|00D50C:95|High Jump (Enable during level).}}
{{CodeRow|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 }}
}}

==References==
<references/>

{{SonicChaosOmni}}