| 摘要 |
PROBLEM TO BE SOLVED: To provide an extraction probability controller which changes and controls the probability of extraction of the occurrence of a jackpot on a symbol display device according to playing conditions on a pachinko game machine. SOLUTION: A high mode condition in which the probability of extraction of the occurrence of a jackpot on a special symbol display device 2 is highly likely to fluctuate and a low mode condition in which the probability is less likely to fluctuate are provided and switched from one to the other in a certain time period after power is supplied, and each time a predetermined character symbol 212 appears in a non-determining symbol display area 201, the probability of extraction is changed to that selected by use of a random counter. Provided that the predetermined character symbol 212 appears in the non-determining symbol display area 201 when the jackpot has occurred, the probability of extraction used in the special symbol display device 2 is shifted to a higher probability even if the jackpot was won with normal symbols. |
