Nintendo Mini Classics: Donkey Kong Jr. and Super Mario Bros are on the way!
Not working, price was only $5. If it's the same MCU as the Game & Watch ones, it's a bargain. We'll see..

https://en.wikipedia.org/wiki/Nintendo_Mini_Classics
"The companies that help distribute them are also responsible of the programming for their versions of the titles, which is why some might sound and behave differently."