A game system that is capable of performing a game by employing an information card in place of a conventional paper-based system is provided.This game system includes: a plurality of gaming machines; a bill identifying device that is associated with each of the gaming machines, for identifying bills of different currencies and an amount of the bills, and outputting data representative of an identified result; a player tracking device that is integrated with each of the gaming machine, for converting data output from the bill identifying device to credit data for executing a game, based on a money exchange rate stored therein, and sending out the converted credit data to the gaming machine; a control device for inputting a money exchange rate from an outside, providing the input money exchange rate to the player tracking device, and updating the money exchange rate stored in the player tracking device; and an information card device that is integrated with the player tracking device, for causing an information card to store data equivalent to an amount of money to be awarded to a player according to a game result of the gaming machine, and sending out credit data for executing a game to the gaming machine.