| 摘要 |
PROBLEM TO BE SOLVED: To provide a pinball game machine which effectively increases player's expectation of a transition to the next round in a low probability round and his/her willingness to play the game and gives him/her sufficient satisfaction when proceeding to the next round in the low probability round. SOLUTION: The pinball game machine, which produces high probability rounds where the probability to proceed to the next round is high and low probability rounds where the probability to proceed to the next round is low compared with the high probability round, controls to change at least the next round from the low probability round to the high probability round based on the entering of a game ball into a specific region to trigger the occurrence of the next round during the low probability round. COPYRIGHT: (C)2004,JPO
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