Abstract: In order to provide a game system capable of directly enhancing an incentive to play a game a lot, in a game system, a first game device accommodates a portable storage medium, generates information relating to an amount a player plays, and writes game parameters for information relating to the play amount to the portable storage medium. A second game device also accommodates the portable storage medium, reads game parameters stored on the accommodated storage medium, and carries out prescribed game processing based on the read-out game parameters.