标准数独基础上，如果圆圈格子是A，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，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，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，每个区域内的多位数是平方数（从左到右，上到下观察）。
Classic rules applied. Additionally, numbers in colored zones should be square numbers with order (left→right, up→down).
标准数独基础上，每个虚线框内数字不重复，角标是框内数字之和。
Classic rules applied. Additionally, numbers cannot repeat in each cage, clue is the sum of the numbers.
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.
标准数独基础上，提示数是这一方向上前若干个数字之和。
Classic rules applied. Additionally, outside clue is the first several numbers' sum in this direction.
标准数独基础上，外圈的提示数为摩天楼观测数。圆圈内数字等于线条上数字之和。
Classic rules applied. Additionally, the outside number is skyscraper numbers, with arrow circle is the sum of numbers on arrow line.
Skyscraper numbers shows how many numbers can be seen in this direction, when larger number will hide lower ones.
标准数独基础上，每个虚线框内，上方数字的乘积等于下方的多位数。
Classic rules applied. Additionally, in each cage, numbers above products to multi-digit numbers below.
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.
