| 摘要 |
PROBLEM TO BE SOLVED: To improve conventional puzzles being simple and uninteresting. SOLUTION: A puzzle has cut angles configured such that stored six pieces thereof has a rectangular shape having sides in a ratio of 3:2. Therefore, the puzzle is allowed to form multiple structures different from the conventional puzzles, and is effective in inspiration of the children, or dementia prevention, and further brain activation. COPYRIGHT: (C)2011,JPO&INPIT
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