A system for cleaning windows in tall buildings, comprises a chassis with means for its mounting on a suspended platform. The head gimbal is supported by the swing arm such that the head slider protrudes from the prong of the swing arm. The retention element is further configured to retain the pillow insert relative to the bed by tucking the retention element under the mattress of the bed. In the child machine, a game screen including the object to be operated is generated and displayed on the basis of the received drawing information.