Yeah, game code would be more exact, but nobody seems to have much interest in diggin into the Z80 ASM. I definetly don't. (I've already derailed all my other ROM hacking project with the work I've put in on this so far. Not that I mind, bud disassmbling code for a mostly undocument (in English at least) Japanses computer without quality tools isn't something I'm interested in at the moment.)
That said, as I've mentioned before, if anyone is interested, I can provide some useful pointers on the format of the disk images, where the code, levels, graphics, text, etc. are for both the X1 and PC88 disk images. They're both z80 based so anyone who knows that CPU (GB hackers, I guess) wouldn't have to hard a time with some of it.
Furthermore, I don't much care for the z80 ISA. Call me weird.