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.
标准数独基础上，涂色格数字大于相邻的白色格内的数字。
Classic rules applied. Additionally, numbers in colored cells are larger than numbers in white cells adjacent to it.
标准数独基础上，框内数字是多位数质数（左→右，上→下）。
Classic rules applied. Additionally, numbers are multi-digit prime (left-right, up-down) in cage.
标准数独基础上，涂色格子填入奇数。
Classic rules applied. Additionally, colored cells contain odd numbers.
标准数独基础上，灰色数字有且仅有一个是错误的。
Classic rules applied. Additionally, there's only one false number in grey numbers.
① 在白格内填入1~3，使得每行、列、宫内都是1~3不重复。每个区域内可能有一些空格不填入数字。
② 灰格为提示数，其中的数字表示其相邻格内所有数字的和（空白格视为没有数字；问号表示和是未知的）；其中的点数表明该处的和由几个数字相加得到（没有点数意味着其相邻格没有数字）。
标准数独基础上，箭头指向其周围四个数之中，唯一一个最大的数字。
Classic rules applied. Additionally, the arrow points the unique max number in the four cells around it.
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。
Classic rules applied. Additionally, the sum of numbers on each line is the numbers in circle.
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，每个胶囊里包含了一个奇数和一个偶数。
Classic rules applied. Additionally, each capsule contains an odd number, and an even number.
