Pixel. 3D Images - is a fascinating mathematical game in which you as a student have to decode images, encrypted by mathematical expressions, by solving them and finding the coordinates of the points (pixels) of the picture. Each point of the encrypted picture has two coordinates, X and Y. Thus, to decipher one point, it is necessary to solve two mathematical expressions. As soon as both coordinates are found, the corresponding point appears in the picture. So gradually the whole picture will be revealed. The game is aimed at improving the skills of calculating mathematical expressions in the mind.