Another clever idea by Tora Magic. You show 4 different color sides on the dice and whatever color they chose the dice changes to a solid die of that chosen color. The effect can re repeated as often as you want with zero reset. They do a lot with a basic idea here and there is no memory work as the color of the die tells you how to lift the lid. More to this than at first meets the eye. In fact, I think this could be made in a micro version and it would make a wonderful 4 way out prediction mechanism.