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Priority to TW83100237ApriorityCriticalpatent/TW252198B/en
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The present invention relates to a slot machine, which performs the game when receiving a plurality of game media predetermined, characterized in that when receiving the start of execution game, it will detect that the number of media received has not reached the plurality of game media predetermined; after the detection, it will set the number of prize balls corresponding to the combination of the patterns in accordance with aforesaid number of media received. Thus, game can be played without returning to the player the pin-balls which are less than the basing number.