Thanks very much for posting this. I've also been researching HTH releases among other things.
I've managed to dump 24 of them so far and posted them recently: https://www.smspower.org/forums/18356
Attached pictures of some of the small boxed one.
And I started to make a list of them: https://www.smspower.org/Games-Releases/SMS-TW-HTH
I would love if you could help me build this list.
If you have any pictures of the games listed above I would be interested.
Could you also share the adverts you found?
I'm also generally studying and researching all Sega 8-bit games (GG wise I have pretty much complete EUR/USA/JPN collections, and now researching non-Japanese Asian titles including trying to build a list of all the xx-in-1 variants and get them dumped and emulated).
Cheers,
Omar/Bock