标准数独基础上，任意两个呈马步的单元格中，不能有相同的数字。
Classic rules applied. Additionally, no two cells that is a knight-step away can contain the same digit.
填入0~3，使得每行列宫内数字不重复。此外，每条线条上的数字之和等于圆圈里的数字。
Write 0~3 into cells, make numbers no repeated in each Row, Colulmn and Box. Additionally, the sum of numbers on each line is the numbers in circle.
标准数独基础上，每个涂色区域中的数字不重复。
Classic rules applied. Additionally, numbers cannot repeat in each colored region.
标准数独基础上，每一条线条在它经过的每个宫内的每一段，数字之和相同。
Classic rules applied. Additionally, digits along each line have an equal sum within each Box it passes through.
标准数独基础上，如果圆圈格子是A，则线条上有A个数字比A大。
Classic rules applied. Additionally, number A in circle, A numbers larger than A on line.
标准数独基础上，每条线上的数字按顺序从一端到另一端是一组等差数列。
Classic rules applied. Additionally, on each line, numbers form arithmetic sequence in order from one side to another side.
标准数独基础上，每个区域内数字不重复，角标是区域内数字之和。
Classic rules applied. Additionally, numbers cannot repeat in each region, clue is the sum of all the numbers in that region.
标准数独基础上，任意对角相邻的两格数字不同。
Classic rules applied. Additionally, numbers cannot be same with all the numbers around it.
填入1~7，使得每行、列、宫内数字不重复。相邻的两个单元格内，数字之差不能是1。
Write 1~7, make numbers no repeated in each Row, column and Box. Numbers in two adjacent cells cannot be consecutive.
标准数独基础上，白点周围数字顺时针增大，黑点周围数字逆时针增大。所有符合条件的地方都被点标记。
Classic rules applied. Additionally, numbers around a white dot increases clockwise, while the number around the black dot increases counterclockwise. All possible places are marked with dots.
