Abstract: Movement control of a player character in a field in a virtual space is performed based on a user's operation input. At least one first type of object is disposed in the field. Lightness for the first type of object is set such that the first type of object is visually recognized even when the field is dark. When the player character satisfies a first condition at a location where one of the at least one first type of object is disposed, lighting is set in the virtual space such that a range in the field including the location is lighter than before the first condition is satisfied.

Abstract: An air conditioning system includes an air duct for receiving and passing air therethrough, a water tank embedded in a ground outside a room, and a fan communicating with the air duct. The air duct extends through the water tank at a predetermined depth to cool the air passing through the air duct. The fan supplies air passing through the water tank into the room to efficiently cool the room.