To provide a slot machine having gaming properties which can be enjoyed by a skilled player, a skilled player together with a beginner and the like.

A transparent display panel 17 is mounted on the front of the body of the slot machine covering display windows 5L, 5C and 5R. With the condition that the predetermined event is generated, the display aspects are changed in the respective symbol observation regions of the transparent display panel 17 so that the variation of the figures on reels 6L, 6C and 6R is hindered from being observed through the display windows 5L, 5C and 5R. Amid the performance, when stop buttons 28L, 28C and 28R are pushed by the right-to-left or left-to-right sequence and when the combination of the symbols showing the winning of the internal win as predetermined lines up on the betting line, a first special favor is granted. On the other hand, when the stop buttons 28L, 28C and 28R are forcibly pushed by the depressions other than the right-to-left and left-to-right sequence and when the predetermined combination of the symbols lines up regardless of the internal win on the betting line, a second special favor higher than the first special favor is granted.