The present invention provides a gaming machine which is capable of realizing an appropriate balance between players’ profits and slot machine providers’ profits. The compositions include chromatically selective scattering particles having small sizes and narrow size distributions. The cover has a peripheral lower wall of vertical configuration whose outline conforms to the contour of the base and an upper wall curving inward near the top of the radome, the peripheral lower and upper walls being connected on each face corresponding to a side of the rectangle by at least one sloping side curving inward in the immediate proximity of the radome. The end effector moves the offset tool to the offset target and docks them.