There really is not much to say. The idea is very nice. What I like is the zoom on Europe in the bottom left corner. That makes it a little easier. Unfortunately, however, dissolves in some places the first layer of the card of the second, so that there then the material is pushed to abrubbelm more back and forth than actually to go from. Here you have to help out in which you hold with one hand and with the other removes the material.
