"the digital game"? The only reason this thing needed batteries was to light up the LED. The movement required you to wind it up by hand. A series of cogs and cams somewhat randomized the action, but not enough to keep me from getting bored with it in a few seconds when I was eight. And it made a terrible racket. But it was Christmastime in 1977, and all the rich kids got the high-tech pong in their stockings. The poor kids got this instead. The box actually said "no TV set is needed", as if that were a good thing. Dig that awesome 70's future-font.