So... I think I owned only one Game & Watch handheld, which my Dad bought for me when we passed through Hong Kong in the early 1980s. It was Mario Bros. But I also remembered Boxing, Fire Attack, Octopus and Super Mario Bros. at least, which were traded around the playground in elementary school. I always loved playing them, and recently learned more about their history and the fact that they were rated by Gunpei Yokoi, who I think was a really gifted designer.
If you haven't found them yet, check out (and play!) Itizso's brilliant RetroFab line here: https://itizso.itch.io/retrofab which include alot of G&W titles.
Anyone else play the original handhelds at some point?