A game system for playing a basic game, includes: slot machines which, when a combination of "BONUS" symbols stop in a winning line, transmit a signal for switching to a roulette game; a second game device, separate from the slot machines, which executes a second game; and a display for displaying an image corresponding to game status of the second game device. In cases in which the switching signal has been transmitted from any one of the slot machines, other slot machines enter a mode that allows the players at the other slot machines to participate in the second game. Furthermore, the game system includes a central controller which can communicate with the slot machines, the second game device, and the display, and which, upon reception of the switching signal from the slot machine, transmits a roulette game start signal to start the roulette game in the second game device.