A microcomputer 11 stays in a power saving mode until a remote control signal is input and a first interrupt signal is input to an interrupt terminal 14. The first, the second, the third, the fourth, and the fifth lens groups are arranged in this order from an object plane. The switching unit has a first switch which is connected between the switchable capacitances, and also further switches, which are connected with respect to a supply voltage terminal. The casino-based game units enable the play of linked wheel games.