If you've blocked our ad, please consider unblocking it.
We promise it isn't annoying. No flash, no sound, ever.
Sonic Chaos (Sega Master System)
At the title screen, press Up, Up, Down, Down, Right, Left, Right, Left, 1.
At the title screen, press Down, Down, Up, Up, Left, Right, Left, Right, 1.
Stored at xC0 in the ROM:
MS SONIC¥CHAOS < Ver1.20 > 1993/08/03 @SEGA /Aspect Co.,Ltd