Game System, Game System Control Method and Information Storage Medium

摘要

To provide a game system that enables a degree of difficulty of an occurrence of a predetermined game event to be changed depending on a degree of proficiency of a player in a game in which the predetermined event is made to occur when a controller is operated according to specific procedures. The present invention relates to a game system including one or more controllers. In the game system, a determining unit (52) determines whether or not a criterion operation data string has been inputted from the controller within a determination target period, a game event generation unit (58) generates a predetermined game event according to a result of the determination made by the determining unit (52), and the determining unit (52) changes a length of the determination target period based on a result of a past determination on at least one of the one or more controllers.