规则Rules：
标准数独基础上，每个区域内的提示是区域内多位数的因数。所有的多位数都是从左到右、从上到下读出来的。
Classic rules applied. Additionally, the clue is the factor of the multi-digit number in each region. All the multi-digit number is read from left to right, up to down.
◆例题 Example
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
