Patent ID: 8033915

Claim:
A game system comprising: a plurality of game machines; and a server in communication with said game machines, each of said game machines configured for playing different kinds of games from each other, one of each of said game machines or said server comprises a converting device for converting play-information indicating the contents of a user's playing in each game on each of said game machines into points in accordance with the contents of the play-information, the points having a trading value unified throughout the games and are tradeable for game elements to be used uniquely in one of the games, each of said game machines comprising a first sending device for sending sending-information including identification-information to identify a user and the points when said converting device is mounted on each of said game machines, or including the identification-information and the play-information when said converting device is mounted on said server, said server comprising: a point storage device for storing the points converted by the converting device and the identification-information associating with the points so as to correspond with each other; an updating device for updating the points in the point storage device by adding the points converted by the converting device; a trading device for trading the points stored in the point storage device for any one of a plurality of game elements, each of which is used uniquely in any one of the games; and a second sending device for sending the traded game element to said game machine operated by the user associated with the traded points.