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 encounters a gate, it will both flip the state of the gate (changing it's color), and be deflected to the left or right depending on the initial state of the gate. Marbles drop to the bottom of the frame and are collected in side pockets to be reused.

You reset the game to one of two starting positions by tilting the frame to the right or left, so that all the gates face the same way. The four corner gates are colored differently so that they will always be the opposite color of the rest of th