PROBLEM TO BE SOLVED: To enhance an interest of a player in a game system. SOLUTION: Different bingo cards are produced for every game systems using a production number so as to produce the bingo cards by the number of the game systems. Conditions based on the game results are allotted to respective boxes and when the conditions are cleared, the box is opened. When an either line of A-L gets bingo, an item to be used for the game is provided to the player. A hint for the conditions for opening the box is randomly displayed. Rankings of every stores are released on WEB page to allow the player to look the bingo cards of other stores.
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