Patent ID: 7749085

Claim:
A network game system, comprising: a center server; and a game machine, installed in an amusement arcade and communicatively connected to the center server, the game machine being operable to execute a game program; wherein the game machine comprises: a first storage, operable to store first information that identifies the game machine; and a first transmitter, which transmits a packet to the center server, the packet including the first information and a network address uniquely assigned to the amusement arcade; wherein the center server comprises: a first receiver, which receives the packet transmitted by the first transmitter; an acquirer, which acquires second information that identifies the amusement arcade in which the game machine identified by the first information is installed; an operation determinant, which determines whether the amusement arcade to which the network address is assigned matches with the amusement arcade identified by the second information, and generates third information in a case where it is determined that the amusement arcade to which the network address is assigned does not match with the amusement arcade identified by the second information; and a second transmitter, which transmits the third information generated by the operation determinant to the game machine; wherein the game machine further comprises: a second receiver, which receives the third information transmitted by the second transmitter; and a controller, which inhibits the execution of the game program, in a case where the second receiver receives the third information, and wherein in a case where the second receiver does not receive the third information, the controller enables the execution of the game program.