PURPOSE: To make skill interventionality and equality into harmony by making a controller suspend its stopping control conformed to a random number value as much as a portion for preset game frequency when specified conditions are achieved during a game.

CONSTITUTION: Rotation and stoppage of reels 3L, 3C, 3R are controlled by a controller. Stop button switches 5L, 5C, 5R are connected to a central processing unit 11 in addition to a clock pulse generating circuit 12, and furthermore position sensors 8L, 8C, 8R detecting each rotation position of these reels 3L, 3C, 3R are connected thereto. A large hit flag comes to '1' along either of winning lines in three display windows when a combination of patterns of 7-7-7, and it stops these three reels 3L, 3C, 3R at respective specified positions when a corresponding random number value is subjected to sampling. At this time, stop control over a rotating reel is suspended for a period of specified game frequency. In breif, reel rotation is stopped with timing of pushing the stop buttons 5L, 5C, 5R.