规则Rules：
标准数独基础上，每个灰色区域中是一组连续的数字（可能是乱序）。
Classic rules applied. Additionally, in each grey regions, numbers a group of consecutive numbers (may out of order).
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
