Oruc
Reactionary
In the late 80s there were a number of one-game pocket electronic devices. I had a few of them (three iirc).
Octopus was the one i played the most, although not the more advanced for its time:
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I suppose the most popular of the lot was the Mario game (the original Mario, by Nintendo, was a handheld with this sort of light-effect-based images. Basically the screen had already all of the inked images on it, but they would only be lit when you moved to their position).
I was given quite a few cheap versions of those, I could never tell what happening