A photosensitive drum is rotatably supported in a main body. A puzzle element arrangement pattern within the predetermined area is altered in accordance with a player’s operation. The auxiliary roller is displaced as paper is displaced in a stack direction of the paper, and can be freely rotated. In this way, the blooming operation reduces a probability that the photosensitive sensor becomes saturated during an idle period of the pixel, and thus reduces the likelihood of electrical charge from a pixel that is not intended contribute to an image from spilling over and potentially contaminating a pixel that is intended to contribute to the image.