| 摘要 |
PROBLEM TO BE SOLVED: To avoid a decrease in the player-attracting property of a game machine by fully entertaining a player even during a non-special game in modes other than a high-probability mode, while maintaining average winning rate approximately at a desired value, and convincing the player that the non-special game is being played in which the probability of winning the lottery to achieve a special winning combination is lowest. SOLUTION: In the probability-changing pachinko machine shown in the figure, the probability with which a jackpot is won in a medium-probability mode is about equal to that of a pachinko machine of the old type without probability-changing modes, and the probability with which a jackpot is won in a high-probability mode is set at a value about equal to that used in any conventional probability-changing pachinko machine. Thus, the average winning rate is maintained at a value close to the desired value and the pachinko machine can make the player fully enjoy a game in the medium-probability mode without reducing the probability of wins in the high-probability mode in which the highest probability of winning may be achieved.
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