A slot machine for playing games has a set of three normal reels, with symbols arranged on their peripheries. The normal reels are rotated in a normal game, and are stopped to determine a win, in accordance with a combination of symbols of the normal reels along a predetermined first winning line. A win is selected from a normal win and a specific win. A bonus game is triggered when the specific win is provided. There is at least one specific reel having symbols which are arranged on its periphery. The specific reel is rotated in the bonus game, and is stopped to determine the win, in accordance with a symbol on the specific reel at a predetermined winning position.