Sonic Chaos (Game Gear)
Tails is back as a playable character. Chaos!, this is also a port of the Master System version
Sonic & Tails Demonstration Sample proto as found here.
Existing in both versions of the game, this zone (ID 06) has a blank name, so it's referred to as simply "ZONE" on the title card. Layout-wise, it's a copy of Turquoise Hill with few differences, apart from the occasional graphical glitch:
- The giant Motobug boss in Act 3 is glitched; after it is attacked once, it stays in its "flashing" palette for the rest of the fight.
- The HUD doesn't clear correctly before the boss, and continuously loops around the screen until part of it becomes overwritten by the boss graphics.
- All Acts oddly use the bonus stage music.
I think the SMS version of the Gigapolis theme is in the Game Gear version, albeit unused in-game and at a lower pitch.
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".