标准数独基础上，每条线条上的数字之和等于圆圈里的数字。本题由四个四阶数独组成（仅使用1~4），盘面之外不包含数字。
黑点两侧数字为2倍关系，白点两侧数字之差为1。所有符合条件的地方都被点标记，1和2之间可能是任意一种标记。
填入已、己、巳，使得每行列宫内都是一个已、两个己、一个巳。
Write 已、己、巳, make each Row, Column and Box contain 已x1, 己x2 and 巳x1.
标准数独基础上，对于每个涂色格，其周围比它小的数字已经全部被箭头指出。
Classic rules applied. Additionally, to each colored cells, all the smaller numbers around it are marked by arrows.
标准数独基础上，涂色区域内包含两组1~6的数字。
Classic rules applied. Additionally, the colored region contains two groups of 1~6.
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.
填入1~6，使得每宫内及每行列（三种方向上）数字不重复。
Write 1~6, make numbers no repeated in each Box or each Row (in three directions).
填入0~3，使得每行列内数字不重复。此外在每个轨道上，虚线框经过的所有格之和，与其内部所有数字的和相等。
Write 0~3, make numbers no repeated in each Row and Columns. Additionally, in each orbit, numbers the line pass through, have the same sum with all the numbers inside the orbit.
标准数独基础上，每个涂色区域中是一组连续的数字（可能是乱序）。
Classic rules applied. Additionally, in each colored regions, numbers a group of consecutive numbers (may out of order).
标准数独基础上，提示是其周围数字的和。
Classic rules applied. Additionally, numbers in circle is the sum of the numbers around it.
