Methods of growing nitride semiconductor layers including forming nitride semiconductor dots on a substrate and growing a nitride semiconductor layer on the nitride semiconductor dots. New games are created on the fly by making combinations of game attributes including but not limited to theme, denomination, volatility, RTP. The compound of the present invention is decomposed earlier than an electrolytic organic solvent, and an organic SEI film is formed on a negative electrode, thereby inhibiting the electrolytic organic solvent from decomposing.