Game system, game device capable of being used in the game system, and computer-readable memory medium

Data link-up between multiple game devices can be more flexibly achieved. A game system (1) comprises a game device for business (2) and a game device for use at home (3), which execute games in accordance with predetermined programs, it being possible to exchange information between these game devices, and the game device for business (2) comprises an information output device for outputting judgement information for judging whether predetermined conditions have been satisfied in the game device for business (2). The contents of the game executed on the game device for use at home (3) are changed based on the judgement information output from the game device for business (2). For example, when a predetermined game result has been achieved in the game device for business, the content of the judgement information is updated, and a hidden element appears in the game device for use at home (3) in correspondence therewith.