Sonic Blast (Sega Master System)
Document the absurdly long opening theme.
The Master System version of Sonic Blast is a lazy port of what's considered one of the worst Sonic games.
That can't be good.
Set address D140 to FF at the title screen, then start the game. The Game Gear version's button code is unusable here due to the 1 button serving the same function as Start (starting the game, pausing).
Unsurprisingly, the Master System version of the game contains the same generic error handler as its Game Gear counterpart. The code is identical and just as unlikely to ever actually run.
A leftover build date from the Game Gear version is present at 0xC0:
GG SONIC 96 Ver E3 ROM 1996/05/01 @SEGA /Aspect Co.,Ltd