Abstract: An optical signal emitting direction control method of a present embodiment includes arranging a transparent member to extend over an underwater space and an in-air space, causing an optical signal to enter the transparent member from the underwater space via a surface of an underwater portion of the transparent member immersed in the underwater space, and causing the optical signal entered the transparent member to be emitted into the in-air space via a surface of an in-air portion of the transparent member exposed to the in-air space.

Abstract: A game system including a server device connected to a network and one or more terminal devices operated by users and executing a video game that a player character plays a quest in a game space which has a quest data storing unit which stores quest data, a playing status storing unit which stores playing status of the quest, a quest control unit which permits the start of the quest and a hint control unit which notifies the information for the starting conditions. The playing status storing unit acquires the playing status from the quest control unit and updates the playing status, and the hint control unit determines the information for the starting conditions based on the playing status.

Abstract: A game system including a server device connected to a network and one or more terminal devices operated by users and executing a video game that a player character plays a quest in a game space which has a quest data storing unit which stores quest data, a playing status storing unit which stores playing status of the quest, a quest control unit which permits the start of the quest and a hint control unit which notifies the information for the starting conditions. The playing status storing unit acquires the playing status from the quest control unit and updates the playing status, and the hint control unit determines the information for the starting conditions based on the playing status.