规则Rules:
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.
◆例题Example
◆在线涂鸦Draw it Online
◆在线做Do it by CTC
◆在线做Do it by Penpa
到了标准数独解法那里,怎么判断出r6c6为3呢
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