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Are you a bad enough dude to
Fatal Labyrinth is a game that features a kid with an eating disorder that goes through a bunch of randomly generated dungeon floors. This game was originally released in Japan for the Sega Meganet online service before it got a physical release in US and Europe.
Is this effect ever heard in-game? The sound driver doesn't seem to fill this nonzero byte anywhere, and there's no reference to $A01C08 anywhere in the main game code... The sequence (30->10->20) is also unusual, and inconsistent with trap doors.
Write a nonzero byte to Z80 RAM address $1C08 while the song for Floor 30 ($82) is playing. After doing so, at some point in the song, it will stop playing as normal and switch to an alternate sequence which transitions to the Floors 10-19 theme ($8A). This will play for a bit, and then another transition sequence will play, transitioning to the Floors 20-29 theme ($8B).