| 摘要 |
PROBLEM TO BE SOLVED: To allow no measure for selecting between game boards to a game player without providing a prior hint about a predetermined prize winning percentage by generating results in conformity with the predetermined price winning rate regardless of the skill of the game player. SOLUTION: A control means 60 updates the value of a storage part 77 predetermined depending upon the results of a decision reached by a first decision part 74 each time a pin ball is projected. Further, the control means 60 drives the operation to switch a variable prize winning aperture from a disadvantageous state to an advantageous state for a game player when the results of a decision reached by a second decisions part 75 indicates a prize-winning credit at the time of passage of the pin ball through a ball passage area. In this case, when the value of a storage part 77 meets a predetermined assessment value, the variable prize winning aperture augments chances for switching to the advantageous state for the game player. In addition, the control means 60 initiates the change of a pattern in a pattern display means 51 each time the pin ball wins a prize through the variable prize winning aperture, and performs the pattern change for a specified time based on the prize winning frequency, of the pin ball through the variable prize winning aperture, which is previously determined in compliance with prize winning conditions by the first decision part 74. |
