US Patent 7601063 Game system including slot machines and game control method thereof

The game system comprises: a slot machine which includes a controller for controlling a basic game, and which has a function whereby, in the case that a combination of “BONUS” symbols has come to a stop along an active pay line, a second game start signal is transmitted; a second game device which is a separate device from the slot machines, and which executes a roulette game; and a display for displaying an image corresponding to the status of the game executed by the second game device. Furthermore, the game system includes a central controller which has a function of communicating with the slot machine, the second game device, and the display, and which starts the roulette game executed by the second game device according to the reception of a second game start signal.