A conventional game machine informs a player that a big hit prize is caused by inner lottery, however, it does not inform the player that a small hit prize is caused. Prize determination (probability lottery processing) is carried out by determining to which prize group in a prize determining table a random number value generated by a random number generator 36 and specified by a sampling circuit 37 pertain (step 103). When a hit flag of a small hit prize is erected as a result of the inner lottery (step 104), a process of emitting small hit informing sound is carried out (step 105). According to the informing sound emitting processing, a speaker drive circuit 43 is controlled by CPU 31 and the speaker 39 emits informing sound A, B, C and D in accordance with the kind of the hit flag of the small hit prize.
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