| 摘要 |
PROBLEM TO BE SOLVED: To provide the usability for preventing the player from feeling tired. SOLUTION: The player puts his palm on a case which is composed of a base 22 and a cover 23, has an appearance similar to a mouse and is placed on the front side of a game frame 1 and he can control the catapulting force of balls by rotating toward him a dial operating portion protruding from the top of the case by his fingers put on the case.
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