The look of that reminds me of the Merlin game.  My brother got one for Christmas one year.
I remember having some of those handheld games (I bet that I still have them, too).  I loved them as a kid.  There was a green one that was a football game from, I believe, Radio Shack.  I also had a game that I would play for hours, but I can't remember the name of it.  It had a yellow shell and four buttons.  There were four lights that would go off in a sequence, and you had to push the buttons in the same sequence to progress.  It would keep adding one more light to the sequence until you missed one.  I think that I got up to 99 or 100 lights once.
So, MDS, are you going to order one?