We got Heavy Unit U.S.A. Version. It seems pretty rare, I've never seen it before. From the rom labels it seems to have some pretty big changes. Lots of them are labeled differently from current sets in MAME, not just 2 as you might expect. I don't know what all the differences are yet. —
I forgot various versions were added over the years.
Smit might drop by and lurk, but posting days are pretty much over imo.
Smit did get in his words in the 2022 thread after MM2 was added.
All the known Game & Watch stuff completed in 2022 and same with my handheld wants of MB Microvision and 1970s era of Mattel Electronics led games with exception of Armor Battle and Sub Chase because those two titles use a different MCU that is not yet emulated.
There might be other stuff on your wishlist that might have been emulated over past couple years. Visit Haze’s 2023 page on his site.