| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a game machine which facilitates recognition of "a period when a player can conduct changeable operations". Ž<P>SOLUTION: The machine comprises a presentation means which includes a movable member, a drive means, a drive-controlling means, a detection means which is installed so that it can move together with the movable member and can detect a subject without making contact with the subject, a decision means which decides whether a play mode should be switched to a valid operation-performing acceptable mode, a play mode-switching means which switches the play mode to the valid operation-performing acceptable mode, and a presentation-changing means which changes the presentation of the presentation means. The movable member can selectively perform a first condition where the subject cannot be detected by the detection means and a second condition where the subject can be detected. The drive-controlling means controls movement of the drive means so that the condition of the movable member can be shifted from the first condition to the second condition at the beginning of a valid period or the like. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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