Mattel's Mind Boggler (1978, VFD, 2 AA Batteries, Model# 2626)
Try to crack the computer's secret codes! (Note: despite the appearence of the game, it does not make any sound (it looks like it has a little speaker on the front, but it doesn't)). This game was also released in Belgium by M.E.M. and Memoquiz.
Do I have this? Yes, boxed (this is mine pictured).