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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

The Game Gear version on your TV. Chaos!

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.

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:

MS SONIC¥CHAOS  
  < Ver1.20 > 
1993/08/03 @SEGA
/Aspect Co.,Ltd