| 摘要 |
PROBLEM TO BE SOLVED: To improve the derivation rate of developed type and to improve the interest of play as a result by setting plural stages of expected degrees to provide the previously decided displayed result of developed type varied reach conditions. SOLUTION: A special variable display device 40 sets plural kinds of basic type varied reach conditions to be first executed in reach state and sets these conditions so as to change the basic type into the 1st or 2nd developed type in the middle based on the establishment of prescribed conditions. Besides, the reliability (expected degree) of big prize in the respective reach variations roughly classified into plural kinds is set high in the order of basic type, 1st developed type and 2nd developed type. Thus, even when the expected degree of developed type is set higher in comparison with the basic type, the derivation rate of developed type is not extremely lowered and the interest of play can be improved. |
