Copyright Pacific Game Company Inc., Japan, 1970.
(plastic, 3.25" square)
The object is to pull out all the pegs, mix them up, and reassemble. The instruction booklet shown on the following pages says there are 12 ways to do it, shows how to do two of them, and gives blank diagrams to color in the other ten solutions. Here is the solved cube shown above flipped over to show the other three sides: