A game system and game machine

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PROBLEM TO BE SOLVED : To prevent specific information from being used by an unspecified number of players when a specific (rare) performance can be output when specific information (password) is input to a game machine.SOLUTION : A slot machine 10 stores that a predetermined specific game performance is achieved (a mission is cleared), and generates and displays a two dimensional code including information that the specific game performance is achieved when the achievement of the specific game performance is stored after a password is input. A server computer 200 issues a password including release information to allow specific performance to be output, and transmits it to a mobile communication terminal 100 when accessed by use of the two dimensional code including information that the specific game performance is achieved. The slot machine 10 allows the specific performance to be output when the achievement of the specific game performance is stored if the password including the release information is input.