Patent ID: 7507153

Claim:
A mahjong game system constituted by a mahjong game machine comprising a display device for displaying at least an image of tiles owned by a player and tiles that have been discarded by the player, and an image of tiles that have been discarded by an opponent character serving as an opponent in a game, said mahjong game machine thus providing a two-player mahjong game in which said player plays against a plurality of said opponent characters respectively, and an information processing device which is capable of transmitting and receiving data to and from said mahjong game machine, wherein said information processing device comprises: a game data reception device which receives game data transmitted by said mahjong game machine; a game data storage device which stores said game data received by said game data reception device; a ranking criterion setting device which sets a ranking criterion at predetermined time intervals during creation of a ranking list based on said game data; a ranking device which creates, on a basis of said ranking criterion set by said ranking criterion setting device, a ranking list based on said game data stored by said game data storage device; a ranking data transmission device which transmits ranking data ranked by said ranking device to said mahjong game machine; and wherein said ranking criterion setting device selects and sets a single ranking criterion from among a plurality of ranking criteria by conducting a sampling of said ranking data at predetermined time intervals.