To secure the savor of a slot game by enabling a player to play while feeling expectations or an omen of bonus discharge.

When a specified requirement relating to the stock release of a bonus role establishment flag is satisfied, an instantaneous stoppage game is executed for two or more times intensively. In the instantaneous stoppage game, an instantaneous stoppage phenomenon occurs on a left reel. After the instantaneous stoppage game is executed for two or more times intensively, an opportunity to discharge a bonus is given. As a result, the bonus discharge is announced in advance by the instantaneous stoppage of the left reel.