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Sonic Chaos (Sega Master System)

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Title Screen

Sonic Chaos

Developer: Aspect
Publishers: Sega (JP/US/EU), Tec Toy (BR)
Platform: Sega Master System
Released in JP: March 17, 2009 (Wii Virtual Console)
Released in US: February 2, 2009 (Wii Virtual Console)
Released in EU: October 25, 1993
Released in BR: June 23, 1995

AreasIcon.png This game has unused areas.
DevTextIcon.png This game has hidden development-related text.
SoundtestIcon.png This game has a hidden sound test.
LevelSelectIcon.png This game has a hidden level select.

ProtoIcon.png This game has a prototype article
PrereleaseIcon.png This game has a prerelease article
DCIcon.png This game has a Data Crystal page

The Game Gear version on your TV. Chaos!


Read about prototype versions of this game that have been released or dumped.
Prototype Info
Read about prerelease information and/or media for this game.
Prerelease Info

Level Select

Sonic Chaos SMS Level Select.png

At the title screen, press Up, Up, Down, Down, Right, Left, Right, Left, 1.

Sound Test

Sonic Chaos SMS Sound Test.png

At the title screen, press Down, Down, Up, Up, Left, Right, Left, Right, 1.

The Sonic on this screen is part of an Easter egg: Press Down, Down-Right, Right, 1 or 2, and he'll perform a Hadouken!

Unused Levels

Changing RAM address 0xD297 to either $06 or $0D will take you to a level that is just a copy of Turquoise Hill. $06 uses Special Stage music, so it was likely intended for another Special Stage. $0D plays no music at all, which is unusual because it plays the boss theme in the Game Gear version. Both levels function normally with the exception of the boss, which causes camera and VRAM issues.

Build Date

Stored at xC0 in the ROM:

  < Ver1.20 > 
1993/08/03 @SEGA
/Aspect Co.,Ltd