Fifteen reels are arranged in five lines and three columns. Plural kinds of symbols are drawn on each reel at a constant pitch, so that one symbol is observed through a display window. There are three type winnings, such as a line winning, which is completed when predetermined symbols are lined on the winning line, a block winning, which is completed when predetermined symbols are displayed from a group of display windows, and an ANY position winning, which is completed when a fixed number of predetermined symbols are displayed. When one of winnings is completed, the symbols constituting the winning is illuminated by a specific color allocated the winning.