规则Rules：
标准数独基础上，这个题目有多个答案，但你只需要找到唯一确定的一格。
Classic rules applied. Additionally, this puzzle has multiple answers, your just need to find the unique certain number.
作者Author：Confringo
设计主题Theme：自然常数e=2.718287828459452.......
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
