Originally released as a mini-arcade cab like ‘Tabletop’ Game & Watch, Nintendo re-tooled the basic tech of the Tabletop idea into a portable that folds flat to about the size of a Multi-Screen Game & Watch.
The top part is the LCD and a ‘light window’ which allows an external light source (like a lamp or sunlight) to shine through, displaying colour graphics. the image is then reflected on a mirror on the other half of the fold.
It’s quite an involved piece of tech, and this version of Donkey Kong Jr. is easily the closest thing you could get to playing the arcade at home in 1982. There’s much more involved than the Widescreen Donkey Kong Jr. It even has a musical intro and interludes!
Here’s a screen of all the graphics lit up, so you can get an idea of how it plays.It’s easily one of the best Game & Watch releases. Great little game, and it would have blown my mind back in the early 80s.