A punch unit is provided with: a punch, which is reciprocally driven in a punching operation; and, a die, which cooperates with the punch in punching a hole in a soft metal sheet. A long dimension of each blanket holder is substantially parallel to a long dimension of the other. In this way, the player operates the mermaid indirectly and avoids obstacle objects and obstacle images. The first control signal is used to control all of the PMOS transistors and the second control signal is used to control all of the NMOS transistors.