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is a type of logic puzzle designed and published by Nikoli. The purpose of its creation was to present a puzzle that uses no numbers or letters and yet retains depth and aesthetics. ==Rules== ''Masyu'' is played on a rectangular grid of squares, some of which contain circles; each circle is either "white" (empty) or "black" (filled). The goal is to draw a single continuous non-intersecting loop that properly passes through all circled cells. The loop must "enter" each cell it passes through from the center of one of its four sides and "exit" from a different side; all turns are therefore 90 degrees.〔.〕 The two varieties of circle have differing requirements for ''how'' the loop must pass through them: *White circles must be traveled straight through, but the loop must turn in the previous and/or next cell in its path; *Black circles must be turned upon, but the loop must travel straight through the next and previous cells in its path. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Masyu」の詳細全文を読む スポンサード リンク
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