A game system for executing a competition game in which a plurality of players compete. A method of forming a pattern on a group III nitride semiconductor substrate according to an aspect of the invention may include: irradiating a laser beam onto at least one first region for preventing etching in a group III nitride semiconductor substrate; and etching at least one second region exclusive of the first region using the first region irradiated with the laser beam as a mask. Similarly, if the user is using the speaker, the telephone will adjust the speaker volume as user distance from the telephone changes. The conductive ink electrodes are configured to receive the EMG signals from the laryngeal muscles when the endotracheal tube is placed in a trachea of the patient. The at least one conductive member is arranged to be located at an inner position with respect to an outer surface of the transparent hood.