To enjoy a game which can be easily understood by a method wherein after a big hit state is finished, the open time period of a motor-operated open/ closure winning hole is extended by a period of time relating to the numerical value which caused the big hit to clearly correlate the numeral, which caused the big hit, with the advantage.

When a ball enters a motor-operated open/closure winning hole 23, the ball is detected by a sensor and a signal is inputted from the sensor into a CPU, whereupon the CPU begins to display pattern variation on a pattern variation display 25. After a certain length of time, three rows of patterns stop, and if stop numerals are of the same value, a big hit state is generated to open a door plate 27 of a motor-operated open/closure big winning hole 26. And after such big hit state is finished, the open time period of wing pieces 24 of the winning hole 23 is extended by a period of time relating to the numerals (same numerals) which caused the big hit. Thus, a ball easily enters the hole 23 and the contents of the advantage for a player can be easily understood by the player so that interest in game is enhanced.