Patent attributes
A game image representing a part or all of an identical game space is displayed on game machines. A first game machine detects the link strength of wireless communication between the first game machine and a second game machine. The first game machine executes predetermined game processing such that a processing result changes depending on the detected link strength. Further, the first game machine updates the game image based on a result of the predetermined game processing. The first game machine sends game processing information indicating the result of the predetermined game processing, to the second game machine. The second game machine updates the game image based on the game processing information sent from the first game machine.