规则Rules：
标准数独基础上，提示表示其周围两个数中，较大的一个数，或它们的差。
Classic rules applied. Additionally, the clue shows the larger one of the two numbers around it, or their difference.
作者Author：ZrLyg
◆在线涂鸦Draw it Online
◆在线做Do it by CTC
◆在线做Do it by Penpa
