Game system and jackpot lottery system to configure this

A divided the game apparatus to participate in the jackpot lottery into a plurality of groups, to reduce the sense of unfairness of player that can occur in the case of an independent jackpot lottery each other in each group. A drawing machine for jackpot game may each 4 or more gaming devices in accordance with a predetermined grouping condition, performs grouping processing to associate with at least one of the plurality of groups, for each of the plurality of groups, the game apparatus belonging to the group perform a group-specific jackpot lottery process for determining the winning game device to win the jackpot prize from the. In the lottery process, the winning frequency as the number of sheets is often a game device increased the group by the cumulative number of medals to be paid out at the time of the jackpot winning is high. Performing the grouping process every time a predetermined group change condition is satisfied. .The 20