Apply classic Sudoku rules. Each capsule contains one odd number and one even number.
遵循标准数独规则，每个胶囊里面有一个奇数和一个偶数。
Apply classic Sudoku rules. Digit (s) on each arrow must be between two digits pointed by the arrow.
遵循标准数独规则，在箭头中间的数字的大小需在箭头顶端两个数值之间。
Apply classic Sudoku rules. Each circled number denotes the difference of maximum digit and minimum digit in its neighboring 4 cells. Digits can repeat around each circle.
遵循标准数独规则，在四格中间的数字表示四格中最大数和最小数的差值，这四个数字是可以重复的。
Apply classic Sudoku rules. Each circled number denotes the difference of maximum digit and minimum digit in its neighboring 4 cells. Digits can repeat around each circle.
遵循标准数独规则，在四格中间的数字表示四格中最大数和最小数的差值，这四个数字是可以重复的。
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