Patent ID: 7811171

Claim:
A game system comprising a first portable game machine and at least one second portable game machine configured to establish short-range wireless communication with the first game machine, wherein a game image representing a part or all of an identical game space is displayed on each game machine, the first game machine comprises: a link strength detector which detects a link strength of a wireless communication link between the first game machine and the second game machine; game processing execution programmed logic circuitry which executes predetermined game processing such that a processing result changes depending on the link strength detected by the link strength detector, wherein the predetermined game processing uses at least a plurality of attribute parameters which are associated with each of the first and second game machine and wherein the game processing execution programmed logic circuitry executes the predetermined game processing by augmenting a value of each attribute parameter with respect to at least the first game machine depending at least in part on both link strength between the first game machine and the second game machine and a value associated with the same attribute parameter associated with the second game machine; first game image updating programmed logic circuitry which updates the game image based on a result of the predetermined game processing; and a processing result transmitter which transmits game processing information to the second game machine, the game processing information indicating the result of the predetermined game processing, and the second game machine comprises: second game image updating programmed logic circuitry which updates the game image based on the game processing information transmitted from the first game machine.