The metal film of the present invention is a dense film of a single crystal that has very low surface roughness and very good crystal orientation because an arithmetic mean roughness of the surface is not larger than 2 nm and a peak intensity of X-ray diffraction is not less than 20 times the sum of all other peaks. The method forms a colloidal solution film of Si nanoparticles overlying a substrate. Automated contrast optimization may be achieved by stepping through all available color combinations and evaluating the contrast between the part feature and background to select a color combination having a \u201cbest\u201d or acceptable contrast level. Optionally the system determines that the second player has won a progressive prize. Each switching circuit may be controlled so as to limit current in its transformer or inductor in each switching cycle to a peak or average current value common to all switching circuits. While in the smoker mode, an enclosed housing defining the smoker area replaces the non-enclosed housing.