Halloween Faces Memory

To show how good your visual Halloween memory is. The task is to remember and then open slugentical scary faces in pairs. At the first level, there will be only two pairs. But on the tenth - twenty. At first, all the pictures will be open for a few seconds, so that you can remember their location. Then they will turn the same ssluges, and you will reopen them, deleting the pairs in Halloween Faces Memory.