标准数独基础上，箭头格为N，箭头指向N+1。
Classic rules applied. Additionally, number N in arrow cell, N+1 in the direction the arrow points.
标准数独基础上，圆圈内为N，线条上有N个数字与N有相同的奇偶性。
Classic rules applied. Additionally, if the number in circle is N, there are N numbers own same parity with N on the line.
标准数独基础上，每条对角线上数字也不重复。
Classic rules applied. Additionally, numbers cannot repeat on each diagonal.
标准数独基础上，线条上相邻两格数字连续。
Classic rules applied. Additionally, numbers next on line are consecutive.
标准数独基础上，转轮所穿过的格子内的数字必须按照提示的顺序填在格子内。转轮可以旋转90°、180°或者270°（不能翻转）。
Classic rules applied. Additionally, the digits on the circles have to be placed in the same circular order in the four cells that are touched by the circle. The circles may have to be rotated to the correct position by 90, 180 or 270 degrees.
填入1~6，使得每行、列、宫内数字不重复，宫可能是锯齿状的。
Fill the grid with 1~6, make numbers no repeated in each Row, Column and Box. The Box may be irregular.
标准数独基础上，圆圈格子填奇数，方块格子填偶数。
Classic rules applied. Additionally, circle cells contain odd numbers, square cells contain even numbers.
标准数独基础上，提示表示其周围两个一位数或多位数的比值。多位数的阅读方式是从左到右、从上到下。
Classic rules applied. Additionally, the clue is the ratio of the numbers or the multi-digit numbers around it. The multi-digit number should be read from left to right, up to down.
连续数独基础上，提示表示该行列内有多少个挡板。
Consecutive rules applied. Additionally, the clue shows how many bars in this Row/Column.
标准数独基础上，"大"字格填5或6，"中"字格填3或4，"小"字格填1或2。
Classic rules applied. Additionally, 大 means 5 or 6, 中 means 3 or 4, 小 means 1 or 2.
