A game system of the present invention comprises: a second game machine for executing a second game which is different from a basic game played in a slot machine; a plurality of second game terminals, having a bet input device with which a bet on a second game player is to be inputted, and a bet controller for issuing a bet signal in accordance with the second game bet when the second game bet is inputted; a slot machine, having a game controller programmed so as to execute the basic game and also programmed so as to enable play of the second game executed on the second game machine when a prescribed second game start condition is established in the basic game, and a command input device to which a command is to be inputted concerning acceptance or refusal of the second game bet on the second game player from a player other than the second game player, the game controller issuing a command signal in accordance with the command when the command is inputted; and a central controller for determining a payout value to each of the second game terminals based upon the bet signal, the command signal and a result of the second game.