If you want to test your attentiveness, try playing the exciting game Christmas Time Difference. In it, before you will see the playing field divided into two parts. In each of them a picture will be visible. At first glance it will seem to you that the image data is completely identical, but still there are very small differences between them that you will need to look for. To do this, carefully examine both images. Having found an element which is not in one of the figures, select it with a mouse click. So you label it and get a certain amount of points for it.