Think-a-Dot Replica

Think-a-Dot is a puzzle game invented by Joseph A. Weisbecker and sold by Education Science Research (E.S.R. Inc.) in the mid to late 60's.

Think-a-Dot has an upright frame with eight dots on the front face, in rows of three, two, and three. The dots are one of two colors, blue and yellow by convention, that indicate the state of a flip-flop gate inside the frame. There are three openings in the top of the unit through which marbles can be dropped. When a marble travelling through the game e