A robotic device movable in a vertical direction and in prescribed horizontal directions along rails arranged in the prescribed horizontal directions in multiple rows provided at various levels with respect to ground. The robotic device has a frame, wheels coupled to the frame and configured for moving the frame along the rails, and support handles for lifting the frame in the vertical direction from first rails arranged in a first row of the rails to second rails arranged in a second row of the rails. The support handles are configured for providing engagement with the second rails to lift the robotic device in the vertical direction, and for turning the frame into a desired horizontal direction by pushing against the second rails on an intersection between the second rails and third rails arranged in the same row as the second rails.