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Sonic Chaos (Game Gear)
Tails is back as a playable character. Chaos!
Sonic & Tails Demonstration Sample proto as found here.
Sound Code: 0x8E
Unused jingle of unknown purpose.
Sound Code: 0x9B
While not used here, this track would be recycled (albeit in a lower key) in Sonic Triple Trouble as the Sunset Park boss theme.
Like all of Aspect's 8-bit Sonic titles, a basic build string is present at ROM 0xC0:
GG SONIC CHAOS < Ver1.00 > 1993/09/01 @SEGA /Aspect Co.,Ltd
GG SONIC & TAILS < Ver1.01 > 1993/09/07 @SEGA /Aspect Co.,Ltd
Another common feature of Aspect's Sonic games, there's a generic error handler routine at ROM 0x70. If the code at that address somehow executes, the game clears the screen, tries to write the message "ERROR", waits for 3 seconds, and then resets. The game doesn't intentionally jump to this code at any point, and it would be of little use anyway because the message will only be intelligible if an ASCII font is already loaded at VRAM 0x2400 (e.g. on the level select screen).
Press Up, Up, Down, Down, Right, Left, Right, Left, Start at the title screen.
Press Down, Down/Right, Right, 1 at the Sound Test, and Sonic will perform a Hadouken!
The title fonts are different between versions. The larger title screen in the international version moves the "Press Start Button" text down 8 pixels. The international version also gets a trademark to go with its copyright.
The title card fonts are completely different between regions. Notably, the international version does not have act numbers in its font. "Gigalopolis Zone" was shortened to "Gigapolis Zone"